Atmospheric oxidation of isoprene and 1,3-butadiene: influence of aerosol acidity and relative humidity on secondary organic aerosol
Summary: This work explores the impact of acidic sulfate aerosol on the formation of SOA from isoprene and 1,3-butadiene. This study expands on previous work by extending the analysis over a broader range of humidities and aerosol liquid water contents. Extending the experiments to a wider range of hydrocarbons and across a more realistic range of humidities provides data of greater atmospheric relevance and contributes to development of acidity-influenced SOA chemistry mechanisms in air quality models.
M. Lewandowski, M. Jaoui, J. H. Offenberg, J. D. Krug, and T. E. Kleindienst Atmos. Chem. Phys. Discuss., 14, 29429-29458, 2014 AbstractDiscussion Paper (PDF, 581 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
27 Nov 2014
A~characterization of thermal structure and conditions for overshooting of tropical and extratropical cyclones with GPS radio occultation
The POLARCAT Model Intercomparison Project (POLMIP): overview and evaluation with observations
Summary: Eleven 3D tropospheric chemistry models have been compared and evaluated with observations in the Arctic during the International Polar Year (IPY 2008). Large differences are seen among the models, particularly related to the model chemistry of volatile organic compounds (VOCs) and reactive nitrogen (NOx, PAN, HNO3) partitioning. Consistency among the models in the underestimation of CO, ethane and propane indicates the emission inventory is too low for these compounds.
L. K. Emmons, S. R. Arnold, S. A. Monks, V. Huijnen, S. Tilmes, K. S. Law, J. L. Thomas, J.-C. Raut, I. Bouarar, S. Turquety, Y. Long, B. Duncan, S. Steenrod, S. Strode, J. Flemming, J. Mao, J. Langner, A. M. Thompson, D. Tarasick, E. C. Apel, D. R. Blake, R. C. Cohen, J. Dibb, G. S. Diskin, A. Fried, S. R. Hall, L. G. Huey, A. J. Weinheimer, A. Wisthaler, T. Mikoviny, J. Nowak, J. Peischl, J. M. Roberts, T. Ryerson, C. Warneke, and D. Helmig Atmos. Chem. Phys. Discuss., 14, 29331-29393, 2014 AbstractDiscussion Paper (PDF, 6117 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACPSpecial Issue
Evaluating BC and NOx emission inventories for the Paris region from MEGAPOLI aircraft measurements
H. Petetin, M. Beekmann, A. Colomb, H. A. C. Denier van der Gon, J.-C. Dupont, C. Honoré, V. Michoud, Y. Morille, O. Perrussel, A. Schwarzenboeck, J. Sciare, A. Wiedensohler, and Q. J. Zhang Atmos. Chem. Phys. Discuss., 14, 29237-29304, 2014 AbstractDiscussion Paper (PDF, 2711 KB)Supplement (782 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACPSpecial Issue
24 Nov 2014
The impact of temperature resolution on trajectory modeling of stratospheric water vapour
Summary: We investigated the impacts of temperatures of different vertical resolutions on trajectory simulations of stratospheric water vapour by comparing results using 1) MERRA temperatures on model levels; 2) GPS temperatures in finer vertical resolutions; and 3) MERRA temperatures incorporating enhanced waves in finer vertical resolutions. It shows that using GPS and MERRA-wave temperatures tend to dry air by 0.1 and 0.2-0.3 ppmv, respectively, but the interannual variability is essentially the same.
T. Wang, A. E. Dessler, M. R. Schoeberl, W. J. Randel, and J.-E. Kim Atmos. Chem. Phys. Discuss., 14, 29209-29236, 2014 AbstractDiscussion Paper (PDF, 3281 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
24 Nov 2014
Diel and seasonal changes of Biogenic Volatile Organic Compounds within and above an Amazonian rainforest site
A. M. Yañez-Serrano, A. C. Nölscher, J. Williams, S. Wolff, E. Alves, G. A. Martins, E. Bourtsoukidis, J. Brito, K. Jardine, P. Artaxo, and J. Kesselmeier Atmos. Chem. Phys. Discuss., 14, 29159-29208, 2014 AbstractDiscussion Paper (PDF, 854 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
24 Nov 2014
First and second derivative atmospheric CO2, global surface temperature and ENSO
Summary: The previously expected linear relationship between atmospheric CO2 and climate variables including temperature is showing an increasing mismatch. This paper nonetheless provides fresh and possibly definitive support for a major relationship between CO2 and climate. Granger causality analysis provides evidence that rate of change not level of CO2 primarily influences both global temperature and the El Niño–Southern Oscillation. The results may contribute to the prediction of future climate.
High-resolution atmospheric water vapor measurements with a scanning differential absorption lidar
Summary: The scanning differential absorption lidar (DIAL) of the University of Hohenheim is presented.
We show the design of the instrument and illustrate its performance with recent water vapor measurements taken in Stuttgart-Hohenheim and in the frame of HOPE. Scanning measurements reveal the 3-dimensional structures of the water vapor field.
The influence of uncertainties within the calculation of the absorption cross-section at wavelengths around 818 nm for the WV retrieval is discussed.
Profiles of second- to third-order moments of turbulent temperature fluctuations in the convective boundary layer: first measurements with Rotational Raman Lidar
Summary: The exchange of energy between the earth surface and the atmosphere is governed by turbulent processes which form the convective boundary layer (CBL) in daytime. The representation of the CBL in atmospheric models is critical, e.g., for the simulation of clouds and precipitation. We show that a new active remote sensing technique, rotational Raman lidar, characterizes the turbulent temperature fluctuations in the CBL better than previous techniques and discuss their statistics of a typical case.
Temperature profiling of the atmospheric boundary layer with rotational Raman lidar during the HD(CP)2 observational prototype experiment
Summary: Measurements and upgrades of the Rotational Raman Lidar of University of Hohenheim during the HD(CP)2 Observational Prototype Experiment are presented in this publication. This includes 25 h long time series of temperature gradients and water vapor mixing ratio. Through simulation optimum wavelengths for high and low background cases were identified and tested successful. Low elevation measurements were performed to measure temperature gradients in altitudes around 100 m above ground level.
Iodine observed in new particle formation events in the Arctic atmosphere during ACCACIA
Summary: New particle formation (NPF) is an important contributor to aerosol number concentrations in the Arctic and thus has a major role in dictating cloud properties and climate in this region. Here we present direct evidence that the oxidation of iodine in the atmosphere causes NPF in the Greenland Sea. This is important because this is a NPF mechanism that has not previously been considered in modelling studies at these latitudes.
J. D. Allan, P. I. Williams, J. Najera, J. D. Whitehead, M. J. Flynn, J. W. Taylor, D. Liu, E. Darbyshire, L. J. Carpenter, R. Chance, and G. McFiggans Atmos. Chem. Phys. Discuss., 14, 28949-28972, 2014 AbstractDiscussion Paper (PDF, 476 KB)Supplement (1236 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACPSpecial Issue
20 Nov 2014
Formation and chemical aging of secondary organic aerosol during the β-caryophyllene oxidation
Ice nucleation by combustion ash particles at conditions relevant to mixed-phase clouds
Summary: Combustion ash particles nucleate ice in the immersion mode at conditions relevant to mixed-phase clouds. Hence, combustion ashes could play an important role in primary ice formation in mixed-phase clouds, especially in clouds that are formed near the emission source of these aerosol particles. From this study, there is a need to quantify the atmospheric abundance of combustion ashes in order to quantitatively assess the impact of combustion ashes on mixed-phase clouds.
N. S. Umo, B. J. Murray, M. T. Baeza-Romero, J. M. Jones, A. R. Lea-Langton, T. L. Malkin, D. O'Sullivan, J. M. C. Plane, and A. Williams Atmos. Chem. Phys. Discuss., 14, 28845-28883, 2014 AbstractDiscussion Paper (PDF, 4565 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
19 Nov 2014
Long-term real-time chemical characterization of submicron aerosols at Montsec (Southern Pyrenees, 1570 m a.s.l.)
Observations and comparisons of cloud microphysical properties in spring and summertime Arctic stratocumulus during the ACCACIA campaign
Summary: Measurements of cloud microphysics are reported from the Aerosol-Cloud Coupling And Climate Interactions (ACCACIA) campaign. Concentrations of ice particles from two spring and two summer cases are compared with particular attention to the role of secondary ice in these clouds. In addition aerosol measurements were used as input to a primary ice nucleation parameterization, which was compared with observed values of primary ice in these clouds. We found higher concentrations of ice during summer
G. Lloyd, T. W. Choularton, K. N. Bower, J. Crosier, H. Jones, J. R. Dorsey, M. W. Gallagher, P. Connolly, A. C. R. Kirchgaessner, and T. Lachlan-Cope Atmos. Chem. Phys. Discuss., 14, 28757-28807, 2014 AbstractDiscussion Paper (PDF, 7713 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
19 Nov 2014
Interactions of bromine, chlorine, and iodine photochemistry during ozone depletions in Barrow, Alaska
C. R. Thompson, P. B. Shepson, J. Liao, L. G. Huey, E. C. Apel, C. A. Cantrell, F. Flocke, J. Orlando, A. Fried, S. R. Hall, R. S. Hornbrook, D. J. Knapp, R. L. Mauldin III, D. D. Montzka, B. C. Sive, K. Ullmann, P. Weibring, and A. Weinheimer Atmos. Chem. Phys. Discuss., 14, 28685-28755, 2014 AbstractDiscussion Paper (PDF, 1913 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
19 Nov 2014
Long-term (2001–2012) fine particulate matter (PM2.5) and the impact on human health in Beijing, China
Summary: The present study uses Aerosol Optical Depth (AOD) as proxy to estimate 12 years of PM2.5 data for the Beijing central area, and calculate the yearly premature mortality by different diseases attributable to PM2.5. The estimated average total mortality due to PM2.5 is about 6,100 individuals/yr for the period 2001-2012 in the Beijing central area, and for the period 2010-2012 the per capita mortality for all ages due to PM2.5 is around 17.9 per 10,000 person-year.
Complex chemical composition of colored surface films formed from reactions of propanal in sulfuric acid at upper troposphere/lower stratosphere aerosol acidities
Summary: We have observed the formation of colored organic surface films on solutions of propanal and sulfuric acid at acidities chosen to mimic the highly acidic aerosols in the upper troposphere and lower stratosphere. The films were found to be composed of aldol condensation products and polyacetals. If such species also form coatings on atmospheric aerosols, they could impact climate by changing the chemical, optical and cloud-forming properties of aerosols.
A. L. Van Wyngarden, S. Pérez-Montaño, J. V. H. Bui, E. S. W. Li, T. E. Nelson, K. T. Ha, L. Leong, and L. T. Iraci Atmos. Chem. Phys. Discuss., 14, 28571-28608, 2014 AbstractDiscussion Paper (PDF, 4762 KB)Supplement (554 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
19 Nov 2014
Connecting the solubility and CCN activation of complex organic aerosols: a theoretical study using the Solubility Basis Set (SBS)
Summary: Atmospheric organic aerosol is complex and thus a challenge to models. We introduce a theoretical framework (the Solubility Basis Set, SBS) to represent the solubility of multi-component mixtures. Using the SBS, we evaluate the commonly made assumptions about the cloud condensation nucleus (CCN) activity of organic mixtures. We find that material with water-solubilities larger than 1-10 g/L can usually be treated as completely soluble, which simplifies the treatment of organic CCN considerably
Transport of anthropogenic and biomass burning aerosols from Europe to the Arctic during spring 2008
L. Marelle, J.-C. Raut, J. L. Thomas, K. S. Law, B. Quennehen, G. Ancellet, J. Pelon, A. Schwarzenboeck, and J. D. Fast Atmos. Chem. Phys. Discuss., 14, 28333-28384, 2014 AbstractDiscussion Paper (PDF, 3734 KB)Supplement (6379 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
17 Nov 2014
Sulfur-containing particles emitted by concealed sulfide ore deposits: an unknown source of sulfur-containing particles in the atmosphere
Mesoscale modeling study of the interactions between aerosols and PBL meteorology during a haze episode in China Jing-Jin-Ji and its near surrounding region – Part 2: Aerosols' radiative feedback effects
Summary: Solar radiation reaching the ground decreases about 15% in China 3JNS Region and by 20 to 25% in the region with the highest AOD.Aerosol cools the PBL atmosphere but warms the atmosphere above it leading to a more stable atmospheric, which causes a decrease in about 52% of turbulence diffusion and in about 33% of the PBL height, resulting in a positive feedback on the PM2.5 concentration within the PBL and the surface as well as the haze formation.
Spatio-temporal variability of water vapor investigated by lidar and FTIR vertical soundings above Mt. Zugspitze
Summary: We quantitatively analyzed of the spatio-temporal variability (minutes to hours, 500m to 10km) of water vapor (IWV and profiles) in the free troposphere recorded at Mt. Zugspitze (Germany) with lidar and solar FTIR. We found that long-range transport of heterogeneous air-masses may cause relative short-term variations of the water-vapor density which exceed the impact of local convection by one order of magnitude. Our results could be useful for model parametrization and co-location issues.
Variability of Antarctic ozone loss in the last decade (2004–2013): high resolution simulations compared to Aura MLS observations
J. Kuttippurath, S. Godin-Beekmann, F. Lefèvre, M. L. Santee, L. Froidevaux, and A. Hauchecorne Atmos. Chem. Phys. Discuss., 14, 28203-28230, 2014 AbstractDiscussion Paper (PDF, 3584 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
13 Nov 2014
Positive feedback of dust aerosol via its impact on atmospheric stability during dust storms in the Eastern Mediterranean
Summary: In this paper we report on a new mechanism whereby the radiative effect of dust aerosol on surface fluxes acts to increase the dust loading of the atmosphere via modification of boundary-layer stability, thereby acting to enhance the radiative aerosol effect. This positive feedback between dust aerosol and boundary layer stability occurred during a series of dust storms in the Eastern Mediterranean in April 2012, which were studied using a global atmospheric composition forecast system.
Atmospheric brown clouds reach the Tibetan Plateau by crossing the Himalayas
Summary: The Himalayas and the Tibetan Plateau (HTP) region is regularly exposed to polluted air masses that might influence glaciers as well as climate on regional to global scales. We found that atmospheric brown clouds from South Asia reach the HTP region by crossing the Himalayas not only through the major north-south river valleys but rather over large areas by being lifted and advected at mid-troposheric levels. The transport is enabled by a combination of synoptic and local meteorological settings
Uplifting of carbon monoxide from biomass burning and anthropogenic sources to the free troposphere in East Asia
Summary: 1. High CO of 300-550 ppbv are shown in aircraft MOZAIC data between 700-300 hPa over East Asia in three episodes. Correspondingly, elevated CO is observed in satellite MOPITT data at similar altitudes.
2. GEOS-Chem and FLEXPART simulations reveal distinct uplifting processes for CO from fires and anthropogenic sources in the cases.
3. Topography in East Asia affects uplifting of CO in different ways.
4. The new version 5 MOPITT data may help diagnose of vertical transport of CO.
K. Ding, J. Liu, A. Ding, Q. Liu, T. L. Zhao, J. Shi, Y. Han, H. Wang, and F. Jiang Atmos. Chem. Phys. Discuss., 14, 28019-28077, 2014 AbstractDiscussion Paper (PDF, 17703 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
12 Nov 2014
Modelling the contribution of biogenic VOCs to new particle formation in the Jülich plant atmosphere chamber
Summary: We used the MALTE-BOX model to study new particle formation events in JPAC chamber. We found: 1. Compared to kinetic sulfuric acid nucleation, nucleation involving OH oxidation products of monoterpenes showed a better agreement with the measurements; 2. The model simulation revealed evidence of wall influence during the experiments. Thus, in order to capture the observed temporal evolution of the particle number size distribution, the model needs to consider reversible gas-wall partitioning.
L. Liao, M. Dal Maso, D. Mogensen, P. Roldin, A. Rusanen, V.-M. Kerminen, T. F. Mentel, J. Wildt, E. Kleist, A. Kiendler-Scharr, R. Tillmann, M. Ehn, M. Kulmala, and M. Boy Atmos. Chem. Phys. Discuss., 14, 27973-28018, 2014 AbstractDiscussion Paper (PDF, 5974 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACPSpecial Issue
12 Nov 2014
Investigation into chemistry of new particle formation and growth in subtropical urban environment
F. Salimi, L. R. Crilley, S. Stevanovic, Z. Ristovski, M. Mazaheri, C. He, G. R Johnson, G. Ayoko, and L. Morawska Atmos. Chem. Phys. Discuss., 14, 27945-27971, 2014 AbstractDiscussion Paper (PDF, 4163 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
11 Nov 2014
Lidar profiling of aerosol optical properties from Paris to Lake Baikal (Siberia)
Summary: In June 2013, a ground-based mobile lidar performed the 10,000 km ride from Paris to Ulan-Ude, near Lake Baikal. Aerosols have been characterized using two intensive properties: backscatter to extinction ratio and particle depolarization ratio. The results highlights spatial variations in the aerosol mix, with more terrigenous particles over Russia than Europe. Wildfire and desert dust plumes were also observed, offering the first optical characterization of dust from the Caspian-Aral region.
The MACC-II 2007–2008 reanalysis: atmospheric dust evaluation and characterization over Northern Africa and Middle East
E. Cuevas, C. Camino, A. Benedetti, S. Basart, E. Terradellas, J. M. Baldasano, J.-J. Morcrette, B. Marticorena, P. Goloub, A. Mortier, A. Berjón, Y. Hernández, M. Gil-Ojeda, and M. Schulz Atmos. Chem. Phys. Discuss., 14, 27797-27879, 2014 AbstractDiscussion Paper (PDF, 10527 KB)Supplement (882 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACPSpecial Issue
11 Nov 2014
Lifted Temperature Minimum during the atmospheric evening transition
Variations in global methane sources and sinks during 1910–2010
Summary: Atmospheric CH4 increased from 900ppb to 1800ppb during the period 1900-2010 at a rate unprecedented in any observational records. We use bottom-up emissions and a chemistry-transport model to simulate CH4. The optimized global total CH4 emission, estimated from the model-observation differences, increased at fastest rate during 1940-1990. Using δ13C of CH4 measurements we attribute this emission increase to biomass burning. Total CH4 lifetime is shortened by 4% over the simulation period.
A. Ghosh, P. K. Patra, K. Ishijima, T. Umezawa, A. Ito, D. M. Etheridge, S. Sugawara, K. Kawamura, J. B. Miller, E. J. Dlugokencky, P. B. Krummel, P. J. Fraser, L. P. Steele, R. L. Langenfelds, J. W. C. White, B. Vaughn, T. Saeki, S. Aoki, and T. Nakazawa Atmos. Chem. Phys. Discuss., 14, 27619-27661, 2014 AbstractDiscussion Paper (PDF, 1876 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
05 Nov 2014
A critical evaluation of proxy methods used to estimate the acidity of atmospheric particles
Summary: We show that the ion balance and molar ratio methods are unsuitable for use as aerosol pH proxies. Our recommendation is that 1) thermodynamic equilibrium models constrained by both gas and aerosol inputs run in the forward (open) mode, and 2) the phase partitioning of ammonia provide the best predictions of aerosol pH. Given the significance of acidity for numerous chemical processes in the atmosphere, the implications of this study are important and far reaching.
C. J. Hennigan, J. Izumi, A. P. Sullivan, R. J. Weber, and A. Nenes Atmos. Chem. Phys. Discuss., 14, 27579-27618, 2014 AbstractDiscussion Paper (PDF, 8177 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
05 Nov 2014
Seasonal changes in the tropospheric carbon monoxide profile over the remote Southern Hemisphere evaluated using multi-model simulations and aircraft observations
Summary: The Southern Hemisphere (SH) serves as an important testbed for evaluating our understanding of the processes that drive the composition of the clean background atmosphere. Using data from two aircraft campaigns, combined with four atmospheric chemistry models, we find a large sensitivity in the remote SH to biogenic emissions and their subsequent chemistry and transport. Future model evaluation and measurement campaigns should prioritise reducing uncertainties in these processes.
J. A. Fisher, S. R. Wilson, G. Zeng, J. E. Williams, L. K. Emmons, R. L. Langenfelds, P. B. Krummel, and L. P. Steele Atmos. Chem. Phys. Discuss., 14, 27531-27578, 2014 AbstractDiscussion Paper (PDF, 1834 KB)Supplement (1031 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
03 Nov 2014
Sources and contributions of wood smoke during winter in London: assessing local and regional influences
L. R. Crilley, W. J. Bloss, J. Yin, D. C. S. Beddows, R. M. Harrison, J. D. Allan, D. E. Young, M. Flynn, P. Williams, P. Zotter, A. S. H. Prevot, M. R. Heal, J. F. Barlow, C. H. Halios, J. D. Lee, S. Szidat, and C. Mohr Atmos. Chem. Phys. Discuss., 14, 27459-27530, 2014 AbstractDiscussion Paper (PDF, 6080 KB)Supplement (1605 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
31 Oct 2014
Parametrization of convective transport in the boundary layer and its impact on the representation of diurnal cycle of wind and dust emissions
Summary: New parameterizations of the convective boundary layer are used to better represent the diurnal cycle of near surface wind over Sahara and Sahel in a climate model, and the associated emission of dust.
F. Hourdin, M. Gueye, B. Diallo, J.-L. Dufresne, L. Menut, B. Marticoréna, G. Siour, and F. Guichard Atmos. Chem. Phys. Discuss., 14, 27425-27458, 2014 AbstractDiscussion Paper (PDF, 1622 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
31 Oct 2014
Direct measurements of near-highway emissions in a high diesel environment
Summary: By performing source-apportionment modeling, the amount of primary and secondary organic emissions was resolved from a bulk aerosol data set measured adjacent to a major highway in France. Over 70% of vehicles on this highway were diesel, and a high concentration of BC and NOx were measured. Even close to a major highway, the bulk of the aerosol mass was secondary in nature. Radiocarbon data revealed that most of the fossil organic carbon was within primary vehicular emissions.
H. L. DeWitt, S. Hellebust, B. Temime-Roussel, S. Ravier, L. Polo, V. Jacob, C. Buisson, A. Charron, M. André, A. Pasquier, J. L. Besombes, J. L. Jaffrezo, H. Wortham, and N. Marchand Atmos. Chem. Phys. Discuss., 14, 27373-27424, 2014 AbstractDiscussion Paper (PDF, 4691 KB)Supplement (1393 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
30 Oct 2014
Airborne determination of the temporo-spatial distribution of benzene, toluene, nitrogen oxides and ozone in the boundary layer across Greater London, UK
Summary: First highly spatially resolved simultaneous mixing ratios of VOCs, NOx and O3 in the atmospheric boundary layer directly above Greater London (UK) using an airborne research aircraft. Average mixing ratios measured at 360±10 m agl over outer London were always lower than over inner London indicative of strong local vehicular sources. Airborne mixing ratio comparison with LAQN air quality ground monitoring stations suggest that airborne mixing ratios were characteristic of the surface.
Atmospheric transport simulations in support of the Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE)
Summary: This paper describes the atmospheric modeling that underlies the science analysis for the NASA Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE). Summary statistics of the WRF meteorological model performance on a 3.3-km grid indicate good overall agreement with surface and radiosonde observations. The high quality of the WRF meteorological fields inspires confidence in their use to drive the STILT transport model for the purpose of computing surface-influences (“footprints”).
J. M. Henderson, J. Eluszkiewicz, M. E. Mountain, T. Nehrkorn, R. Y.-W. Chang, A. Karion, J. B. Miller, C. Sweeney, N. Steiner, S. C. Wofsy, and C. E. Miller Atmos. Chem. Phys. Discuss., 14, 27263-27334, 2014 AbstractDiscussion Paper (PDF, 13742 KB)Supplement (7699 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
30 Oct 2014
On the derivation of particle nucleation rates from experimental formation rates
Summary: The manuscript provides new insights into the calculation of new particle formation rates. Generally, formation rates are measured at a diameter, which can be substantially larger than the critical size of the new particles. In order to transform the formation rate to a smaller size a correction needs to be applied. The magnitude of the correction factor depends on the assumptions made for the particle loss rate as a function of size. We provide a new universal method to apply this correction.
Radiative forcing and climate metrics for ozone precursor emissions: the impact of multi-model averaging
Summary: This study examines quantitatively the impact of methodological choices, in particular of averaging of multi-model ensembles, on climate metrics for ozone precursors.
Estimates of the standard deviation of radiative forcing (RF), global warming and temperature potentials (GWP, GTP) from ensemble-mean input fields generally overestimate the true value.
The multi-model average fields are appropriate for calculating mean metrics, but are not a reliable method for calculating the uncertainty.
Particle water and pH in the southeastern United States
Summary: Particle pH can affect many aerosol processes, including gas-particle partitioning, (e.g., SOA formation), and mobilization of toxic redox metals. pH is challenging to directly measure and often improperly characterized by proxies like ion balances or molar ratios of measured aerosol ionic species. We present a detailed analyses predicting pH with a thermodynamic model, verify the prediction, and testing pH sensitivity to model inputs based on data from the SOAS field campaign.
H. Guo, L. Xu, A. Bougiatioti, K. M. Cerully, S. L. Capps, J. R. Hite, A. G. Carlton, S.-H. Lee, M. H. Bergin, N. L. Ng, A. Nenes, and R. J. Weber Atmos. Chem. Phys. Discuss., 14, 27143-27193, 2014 AbstractDiscussion Paper (PDF, 10143 KB)Supplement (685 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
29 Oct 2014
The effects of springtime mid-latitude storms on trace gas composition determined from the MACC reanalysis
Summary: Novel use of combined meteorology and composition reanalysis data and compositing methodologies to characterize pollutant distributions of ozone (O3) and carbon monoxide (CO) in 'typical' intense springtime storms versus the background environment for the period 2003-2012. Clear signal of O3 and CO redistributed horizontally and vertically throughout storms. In particular, the lofting of CO-rich/O3-poor air in the warm conveyor belt and the descent of O3-rich/CO-poor air in the dry intrusion.
Aerosol processing and CCN formation of an intense Saharan dust plume during the EUCAARI 2008 campaign
N. Bègue, P. Tulet, J. Pelon, B. Aouizerats, A. Berger, and A. Schwarzenboeck Atmos. Chem. Phys. Discuss., 14, 27039-27091, 2014 AbstractDiscussion Paper (PDF, 6801 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
28 Oct 2014
A multi-year study of lower tropospheric aerosol variability and systematic relationships from four North American regions
Summary: Variability in aerosol optical properties relevant to radiative forcing were studied on several timescales at four continental North American NOAA-ESRL sites. Light scattering and intensive properties varied most on seasonal scales while absorption variability on weekly and diurnal timescales was comparable to its seasonal variability. Large reductions in light scattering were observed at the two long-term sites (relative to late 1990’s), along with a smaller contribution by sub-1µm particles.
Polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and chlorinated pesticides in background air in central Europe – investigating parameters affecting wet scavenging of polycyclic aromatic hydrocarbons
Evaluation of black carbon emission inventories using a Lagrangian dispersion model – a case study over Southern India
Summary: Emission inventories are key component of simulating past, present and future climate. In the current manuscript we have evaluated three black carbon emission inventories for emissions of India using observations made from a strategic location. Annual average simulated black carbon concentration is found to be 35% to 60% lower than observed concentration because of underestimation of emissions of southern India in the inventories.
Characterization of forest fire smoke event near Washington, DC in Summer 2013 with multi-wavelength lidar
Summary: The multi-wavelength lidar technique was applied to the study of a smoke event near Washington DC on 26-28 August 2013. Satellite observations combined with transport model predictions imply that the smoke plume originated mainly from Wyoming/Idaho forest fires. The NASA/GSFC multi-wavelength Mie-Raman lidar was used to profile the smoke particle parameters such as volume density, effective radius and real part of refractive index.
I. Veselovskii, D. N. Whiteman, M. Korenskiy, A. Suvorina, A. Kolgotin, A. Lyapustin, Y. Wang, M. Chin, H. Bian, T. L. Kucsera, D. Perez-Ramirez, and B. Holben Atmos. Chem. Phys. Discuss., 14, 26857-26902, 2014 AbstractDiscussion Paper (PDF, 10336 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
27 Oct 2014
Evaluating the effects of China's pollution control on inter-annual trends and uncertainties of atmospheric mercury emissions
Summary: China’s atmospheric Hg emissions of anthropogenic origin have been effectively restrained through the national policy of air pollution control. Expansion of technologies with high energy efficiencies and air pollutant removal rates leads to a much slower growth of Hg emissions than that of energy and economy. However, increased uncertainties of Hg emissions are quantified from 2005 to 2012, attributed to the unclear operation status or small sample size of field tests on those technologies.
Summary: We present an experimental protocol to constrain the nature of organic vapor wall deposition in Teflon chambers and develop an empirical model to predict the wall-induced deposition rate of intermediate/semi/non-volatility organic vapors in chambers.
X. Zhang, R. H. Schwantes, R. C. McVay, H Lignell, M. M. Coggon, R. C. Flagan, and J. H. Seinfeld Atmos. Chem. Phys. Discuss., 14, 26765-26802, 2014 AbstractDiscussion Paper (PDF, 4747 KB)Supplement (2049 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
24 Oct 2014
Real-case simulations of aerosol-cloud interactions in ship tracks over the Bay of Biscay
Summary: For the first time, real-case simulations of ship tracks are performed at the 2-km scale and evaluated against observations. Simulations show that ship tracks are quantitatively and qualitatively captured by the model. Therefore, this approach could be used to evaluate the interplay between parameterisations for aerosol-cloud interactions which occur, in the case of ship tracks, in spatially defined regions and under constrained environmental conditions.
Modulation of Saharan dust export by the North African dipole
Summary: Long term - 25 years - inter-annual variability of Saharan dust export to the subtropics is correlated with variability in Harmattan wind speeds in central Sahara and with monsoon-rainfalls in the tropics and in the Sahel. This variability is modulated by the intensity of the low-high dipole like pattern we so-called North African Dipole, whose variability may be connected with global oscillations in the climate of the tropics and subtropics.
S. Rodríguez, E. Cuevas, J. M. Prospero, A. Alastuey, X. Querol, J. López-Solano, M. I. García, and S. Alonso-Pérez Atmos. Chem. Phys. Discuss., 14, 26689-26719, 2014 AbstractDiscussion Paper (PDF, 1824 KB)Supplement (3319 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACP
24 Oct 2014
Strong atmospheric new particle formation in winter, urban Shanghai, China
S. Xiao, M. Y. Wang, L. Yao, M. Kulmala, B. Zhou, X. Yang, J. M. Chen, D. F. Wang, Q. Y. Fu, D. R. Worsnop, and L. Wang Atmos. Chem. Phys. Discuss., 14, 26655-26688, 2014 AbstractDiscussion Paper (PDF, 2113 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
24 Oct 2014
AOD trends during 2001–2010 from observations and model simulations
Summary: Thanks to numerical simulations and satellite observations, it is shown that negative Aerosol Optical Depths(AOD) trends (2000-2010 period) over the U.S. and Europe are due to emission decrease, while over the Sahara Desert and the Middle East are due to meteorological changes. Over South East Asia, both meteorology and emissions changes are important for the AOD trends.
It is shown that soluble components strongly influence AOD, as their contribution is enhanced by the aerosol water content.
A. Pozzer, A. de Meij, J. Yoon, H. Tost, A. K. Georgoulias, and M. Astitha Atmos. Chem. Phys. Discuss., 14, 26619-26653, 2014 AbstractDiscussion Paper (PDF, 6732 KB)Interactive Discussion (Open, 3 Comments)Manuscript under review for ACP
23 Oct 2014
Ice crystal concentrations in wave clouds: dependencies on temperature, D0.5 μm aerosol particle concentration and duration of cloud processing
Using the chemical equilibrium partitioning space to explore factors influencing the phase distribution of compounds involved in secondary organic aerosol formation
Summary: The manuscript presents a new way to graphically illustrate some of the processes that occur when organic particles form in the atmosphere. In particular it makes it possible to see how factors such as the composition of the atmosphere and temperature affect these processes.
How emissions, climate, and land use change will impact mid-century air quality over the United States: a focus on effects at National Parks
Summary: We present for the first time the relative effect of climate, emissions, and land use change on ozone and PM25 over the United States, focusing on the National Parks. Air quality in 2050 will likely be dominated by emission patterns, but climate and land use changes alone can lead to a substantial increase in air pollution over most of the US, with important implications for O3 air quality, visibility and ecosystem health degradation at the National Parks.
M. Val Martin, C. L. Heald, J.-F. Lamarque, S. Tilmes, L. K. Emmons, and B. A. Schichtel Atmos. Chem. Phys. Discuss., 14, 26495-26543, 2014 AbstractDiscussion Paper (PDF, 9792 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
22 Oct 2014
Frequency of new particle formation events in the urban Mediterranean climate
M. Brines, M. Dall'Osto, D. C. S. Beddows, R. M. Harrison, F. Gómez-Moreno, L. Núñez, B. Artíñano, F. Costabile, G. P. Gobbi, F. Salimi, L. Morawska, C. Sioutas, and X. Querol Atmos. Chem. Phys. Discuss., 14, 26463-26494, 2014 AbstractDiscussion Paper (PDF, 3518 KB)Supplement (191 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACPSpecial Issue
22 Oct 2014
How much is particulate matter near the ground influenced by upper level processes within and above the PBL? A summertime case study in Milan (Italy)
Summary: Particulate matter (PM) at ground level is of primary concern for the quality of air we breathe. Most direct sources of PM are near the ground, but an important fraction of PM is produced by photochemical processes happening also in the upper atmospheric layers. We investigate the contribution of those layers to the PM near the ground, and found a significant impact. Nitrate is a major player in the “vertical direction”, owing to its sensitivity to ambient temperature and relative humidity.
G. Curci, L. Ferrero, P. Tuccella, F. Barnaba, F. Angelini, E. Bolzacchini, C. Carbone, H. A. C. Denier van der Gon, M. C. Facchini, G. P. Gobbi, J. P. P. Kuenen, T. C. Landi, C. Perrino, M. G. Perrone, G. Sangiorgi, and P. Stocchi Atmos. Chem. Phys. Discuss., 14, 26403-26461, 2014 AbstractDiscussion Paper (PDF, 5018 KB)Supplement (1351 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
22 Oct 2014
Identifying fire plumes in the Arctic with tropospheric FTIR measurements and transport models
Summary: Seven tropospheric species (CO, HCN, C2H6, C2H2, CH3OH, HCOOH, and H2CO) released by biomass burning events transported to the high Arctic were monitored with two sets of FTIR measurements, located at Eureka (Nunavut, Canada) and Thule (Greenland), from 2008 to 2012. We compared these datasets with MOZART-4 chemical transport model to help improving its simulations in the Arctic. Emission factors of these biomass burning products were derived and compared to the literature.
C. Viatte, K. Strong, J. Hannigan, E. Nussbaumer, L. Emmons, S. Conway, C. Paton-Walsh, J. Hartley, J. Benmergui, and J. Lin Atmos. Chem. Phys. Discuss., 14, 26349-26401, 2014 AbstractDiscussion Paper (PDF, 5926 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
21 Oct 2014
Aerosol size distribution and radiative forcing response to anthropogenically driven historical changes in biogenic secondary organic aerosol formation
Summary: We use modeled estimates of BVOCs from the years 1000 to 2000 to test the effect of anthropogenic BVOC emission changes on SOA formation, aerosol size distributions, and radiative effects using the GEOS-Chem-TOMAS model. Changes of >25% in the number of particles with diameters >80nm are predicted regionally due to extensive land-use changes, leading to increases in combined radiative effect of >0.5 Wm-2. This change in radiative forcing could be an overlooked anthropogenic effect on climate.
S. D. D'Andrea, J. C. Acosta Navarro, S. C. Farina, C. E. Scott, A. Rap, D. K. Farmer, D. V. Spracklen, I. Riipinen, and J. R. Pierce Atmos. Chem. Phys. Discuss., 14, 26297-26348, 2014 AbstractDiscussion Paper (PDF, 8650 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
20 Oct 2014
Fossil vs. non-fossil sources of fine carbonaceous aerosols in four Chinese cities during the extreme winter haze episode in 2013
Summary: Source apportionment of fine carbonaceous aerosols using radiocarbon and other organic markers measurements during 2013 winter haze episodes was conducted at four megacities in China. Our results demonstrate that (1)Fossil emissions predominate EC with a mean contribution of 75±8%, whereas non-fossil sources account for 55±10% of OC; (2)the increment of TC on the heavily polluted days was mainly driven by the increase of secondary OC from both fossil fuel and non-fossil emissions.
Y.-L. Zhang, R.-J. Huang, I. El Haddad, K.-F. Ho, J.-J. Cao, Y. Han, P. Zotter, C. Bozzetti, K. R. Daellenbach, F. Canonaco, J. G. Slowik, G. Salazar, M. Schwikowski, J. Schnelle-Kreis, G. Abbaszade, R. Zimmermann, U. Baltensperger, A. S. H. Prévôt, and S. Szidat Atmos. Chem. Phys. Discuss., 14, 26257-26296, 2014 AbstractDiscussion Paper (PDF, 2194 KB)Supplement (214 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
20 Oct 2014
Attribution of future US ozone pollution to regional emissions, climate change, long-range transport, and model deficiency
Summary: This study used a regional air quality model coupled with a regional climate model to investigate the future U.S. ozone pollution. We identified the individual contribution from emissions change, climate change, long range transport and model deficiency, and estimated the uncertainty.
Primary marine aerosol emissions from the Mediterranean Sea during pre-bloom and oligotrophic conditions: correlations to seawater chlorophyll a from a mesocosm study
A. N. Schwier, C. Rose, E. Asmi, A. M. Ebling, W. M. Landing, S. Marro, M.-L. Pedrotti, A. Sallon, F. Iuculano, S. Agusti, A. Tsiola, P. Pitta, J. Louis, C. Guieu, F. Gazeau, and K. Sellegri Atmos. Chem. Phys. Discuss., 14, 26187-26230, 2014 AbstractDiscussion Paper (PDF, 1541 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for ACPSpecial Issue
20 Oct 2014
Standard climate models radiation codes underestimate black carbon radiative forcing
Summary: Radiative forcing (RF) of black carbon (BC) in the atmosphere is estimated using radiative transfer codes of various complexities. Here we show that the 2-stream radiative transfer codes used most in climate models give too strong forward scattering, leading to enhanced absorption at the surface and too weak absorption by BC. Such calculations are found to underestimate RF by 10% for global mean, all sky conditions, relative to the more sophisticated multi-stream models.
Characterization of primary and secondary wood combustion products generated under different burner loads
Summary: Residential wood combustion contributes significantly to the total atmospheric particulate burden; however, uncertainties remain in the magnitude and characteristics of wood burning products. The effects of wood loading on freshly emitted and aged emissions were investigated. Polycyclic aromatic hydrocarbons, which negatively impact health, contributed more to the total organic aerosol under highly loaded burner conditions, which has significant implications for burner operation protocols.
E. A. Bruns, M. Krapf, J. Orasche, Y. Huang, R. Zimmermann, L. Drinovec, G. Močnik, I. El-Haddad, J. G. Slowik, J. Dommen, U. Baltensperger, and A. S. H. Prévôt Atmos. Chem. Phys. Discuss., 14, 26041-26083, 2014 AbstractDiscussion Paper (PDF, 1421 KB)Supplement (1361 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
17 Oct 2014
Signature of tropical fires in the diurnal cycle of tropospheric CO as seen from Metop-A/IASI
T. Thonat, C. Crevoisier, N. A. Scott, A. Chédin, R. Armante, and L. Crépeau Atmos. Chem. Phys. Discuss., 14, 26003-26039, 2014 AbstractDiscussion Paper (PDF, 5766 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
17 Oct 2014
Sensitivity estimations for cloud droplet formation in the vicinity of the high alpine research station Jungfraujoch (3580 m a.s.l.)
Summary: An important quantity which determines aerosol activation and cloud formation is the effective peak supersaturation. The box model ZOMM was used to simulate the effective peak supersaturation experienced by an air parcel approaching a high-alpine research station in Switzerland. With the box model the sensitivity of the effective peak supersaturation to key aerosol and dynamical parameters was investigated.
E. Hammer, N. Bukowiecki, B. P. Luo, U. Lohmann, C. Marcolli, E. Weingartner, U. Baltensperger, and C. R. Hoyle Atmos. Chem. Phys. Discuss., 14, 25967-26002, 2014 AbstractDiscussion Paper (PDF, 2522 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
17 Oct 2014
Revisiting Twomey's approximation for peak supersaturation
Summary: A new parametrization for cloud droplet nucleation is described. This revised approach makes use of a simple lookup table which is very efficient and computationally very cheap. Adopting this approach futher allows for a more accurate treatment of the necessary approximations to supersaturation evolution and ultimately leads to a more accurate calculation of peak supersaturation and thence droplet nucleation.
Study of satellite retrieved aerosol optical depth spatial resolution effect on particulate matter concentration prediction
J. Strandgren, L. Mei, M. Vountas, J. P. Burrows, A. Lyapustin, and Y. Wang Atmos. Chem. Phys. Discuss., 14, 25869-25899, 2014 AbstractDiscussion Paper (PDF, 4288 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
15 Oct 2014
Characterization of satellite based proxies for estimating nucleation mode particles over South Africa
A.-M. Sundström, A. Nikandrova, K. Atlaskina, T. Nieminen, V. Vakkari, L. Laakso, J. P. Beukes, A. Arola, P. G. van Zyl, M. Josipovic, A. D. Venter, K. Jaars, J. J. Pienaar, S. Piketh, A. Wiedensohler, E. K. Chiloane, G. de Leeuw, and M. Kulmala Atmos. Chem. Phys. Discuss., 14, 25825-25867, 2014 AbstractDiscussion Paper (PDF, 1718 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACPSpecial Issue
14 Oct 2014
Total sulphate vs. sulphuric acid monomer in nucleation studies
Summary: A discrepancy between measured sulphuric acid monomer and total sulphate of two orders of magnitude was found, when measured with independent methods (mass spectrometry and ion chromatography), with the same source of sulphuric acid vapour. Ion chromatography method produces exact concentrations as predicted by empirical equations, as mass spectrometry method shows significantly lower values. The discrepancy is investigated thoroughly from different point of views.
K. Neitola, D. Brus, U. Makkonen, M. Sipilä, R. L. Mauldin III, N. Sarnela, T. Jokinen, H. Lihavainen, and M. Kulmala Atmos. Chem. Phys. Discuss., 14, 25787-25824, 2014 AbstractDiscussion Paper (PDF, 1750 KB)Supplement (1225 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
13 Oct 2014
Dust-related ice nuclei profiles from polarization lidar: methodology and case studies
Intercomparison of vertically resolved merged satellite ozone data sets: interannual variability and long-term trends
F. Tummon, B. Hassler, N. R. P. Harris, J. Staehelin, W. Steinbrecht, J. Anderson, G. E. Bodeker, A. Bourassa, S. M. Davis, D. Degenstein, S. M. Frith, L. Froidevaux, E. Kyrölä, M. Laine, C. Long, A. A. Penckwitt, C. E. Sioris, K. H. Rosenlof, C. Roth, H. J. Wang, and J. Wild Atmos. Chem. Phys. Discuss., 14, 25687-25745, 2014 AbstractDiscussion Paper (PDF, 5777 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACPSpecial Issue
13 Oct 2014
On the relationship between open cellular convective cloud patterns and the spatial distribution of precipitation
Summary: Precipitation is necessary but insufficient for transformation to open cells from closed cells. The transformation to open cells occurs for sufficiently small droplet number concentration and/or large rain area. Both of these factors appear to be of similar importance. The distance selects the resulting state for rain regions that alone are too weak to initiate the transformation. The phase trajectory of the variance and mean cloud field properties follow one path.
Assessment of China's virtual air pollution transport embodied in trade by a consumption-based emission inventory
H. Y. Zhao, Q. Zhang, S. J. Davis, D. Guan, Z. Liu, H. Huo, J. T. Lin, W. D. Liu, and K. B. He Atmos. Chem. Phys. Discuss., 14, 25617-25650, 2014 AbstractDiscussion Paper (PDF, 2897 KB)Interactive Discussion (Open, 3 Comments)Manuscript under review for ACP
09 Oct 2014
Effect of biomass burning over the western North Pacific Rim: wintertime maxima of anhydrosugars in ambient aerosols from Okinawa
Summary: Using levoglucosan as a biomass-burning tracer, influence of biomass burning on the air quality of Okinawa Island in the western North Pacific rim was evaluated. High levels of levoglucosan were found in the atmospheric aerosols during winter probably due to the open burning and domestic heating and cooking in north/northeast China, Mongolia and Russia, together with enhanced continental outflow.
Absorption of aerosols above clouds from POLDER/PARASOL measurements and estimation of their Direct Radiative Effect
F. Peers, F. Waquet, C. Cornet, P. Dubuisson, F. Ducos, P. Goloub, F. Szczap, D. Tanré, and F. Thieuleux Atmos. Chem. Phys. Discuss., 14, 25533-25579, 2014 AbstractDiscussion Paper (PDF, 2762 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
09 Oct 2014
Rainfall feedback via persistent effects on bioaerosols
Summary: We show that atmospheric load of ice nuclei is enhanced for up to 20 days after key rainfall events. The rate of enhancement decreases exponentially with time and rainfall quantity and frequency are increased for a similar duration and with similar exponential decreases thereby supporting the notion of rainfall feedback.
We reveal series of significant feedback (+ or -) in rainfall patterns across Australia over the past century and marked changes in feedback patterns.
We point out sites where
Observations and modeling of air quality trends over 1990–2010 across the Northern Hemisphere: China, the United States and Europe
J. Xing, R. Mathur, J. Pleim, C. Hogrefe, C.-M. Gan, D. C. Wong, C. Wei, R. Gilliam, and G. Pouliot Atmos. Chem. Phys. Discuss., 14, 25453-25501, 2014 AbstractDiscussion Paper (PDF, 4354 KB)Interactive Discussion (Open, 3 Comments)Manuscript under review for ACP
08 Oct 2014
On the use of radon for quantifying the effects of atmospheric stability on urban emissions
Dust aerosol radiative effects during summer 2012 simulated with a coupled regional aerosol–atmosphere–ocean model over the Mediterranean
P. Nabat, S. Somot, M. Mallet, M. Michou, F. Sevault, F. Driouech, D. Meloni, A. Di Sarra, C. Di Biagio, P. Formenti, M. Sicard, J.-F. Léon, and M.-N. Bouin Atmos. Chem. Phys. Discuss., 14, 25351-25410, 2014 AbstractDiscussion Paper (PDF, 3454 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACPSpecial Issue
02 Oct 2014
Multi-model study of chemical and physical controls on transport of anthropogenic and biomass burning pollution to the Arctic
S. A. Monks, S. R. Arnold, L. K. Emmons, K. S. Law, S. Turquety, B. N. Duncan, J. Flemming, V. Huijnen, S. Tilmes, J. Langner, J. Mao, Y. Long, J. L. Thomas, S. D. Steenrod, J. C. Raut, C. Wilson, M. P. Chipperfield, H. Schlager, and G. Ancellet Atmos. Chem. Phys. Discuss., 14, 25281-25350, 2014 AbstractDiscussion Paper (PDF, 2835 KB)Supplement (41 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
02 Oct 2014
Carbonaceous aerosols on the south edge of the Tibetan Plateau: concentrations, seasonality and sources
Investigation of secondary formation of formic acid: urban environment vs. oil and gas producing region
B. Yuan, P. R. Veres, C. Warneke, J. M. Roberts, J. B. Gilman, A. Koss, P. M. Edwards, M. Graus, W. C. Kuster, S.-M. Li, R. J. Wild, S. S. Brown, W. P. Dubé, B. M. Lerner, E. J. Williams, J. E. Johnson, P. K. Quinn, T. S. Bates, B. Lefer, P. L. Hayes, J. L. Jimenez, R. J. Weber, R. Zamora, B. Ervens, D. B. Millet, B. Rappenglück, and J. A. de Gouw Atmos. Chem. Phys. Discuss., 14, 24863-24914, 2014 AbstractDiscussion Paper (PDF, 1902 KB)Supplement (1280 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACPSpecial Issue
26 Sep 2014
Reliable, robust and realistic: the three R's of next-generation land surface modelling
An overview of regional and local characteristics of aerosols in South Africa using satellite, ground, and modeling data
S. P. Hersey, R. M. Garland, E. Crosbie, T. Shingler, A. Sorooshian, S. Piketh, and R. Burger Atmos. Chem. Phys. Discuss., 14, 24701-24752, 2014 AbstractDiscussion Paper (PDF, 7933 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
25 Sep 2014
Trends of ozone total columns and vertical distribution from FTIR observations at 8 NDACC stations around the globe
C. Vigouroux, T. Blumenstock, M. Coffey, Q. Errera, O. García, N. B. Jones, J. W. Hannigan, F. Hase, B. Liley, E. Mahieu, J. Mellqvist, J. Notholt, M. Palm, G. Persson, M. Schneider, C. Servais, D. Smale, L. Thölix, and M. De Mazière Atmos. Chem. Phys. Discuss., 14, 24623-24666, 2014 AbstractDiscussion Paper (PDF, 2233 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACPSpecial Issue
25 Sep 2014
Biomass burning influence on high latitude tropospheric ozone and reactive nitrogen in summer 2008: a multi-model analysis based on POLMIP simulations
S. R. Arnold, L. K. Emmons, S. A. Monks, K. S. Law, D. A. Ridley, S. Turquety, S. Tilmes, J. L. Thomas, I. Bouarar, J. Flemming, V. Huijnen, J. Mao, B. N. Duncan, S. Steenrod, Y. Yoshida, J. Langner, and Y. Long Atmos. Chem. Phys. Discuss., 14, 24573-24621, 2014 AbstractDiscussion Paper (PDF, 7409 KB)Supplement (404 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACPSpecial Issue
24 Sep 2014
Aged boreal biomass burning aerosol size distributions from BORTAS 2011
Marine submicron aerosol sources, sinks and chemical fluxes
D. Ceburnis, M. Rinaldi, J. Keane-Brennan, J. Ovadnevaite, G. Martucci, L. Giulianelli, and C. D. O'Dowd Atmos. Chem. Phys. Discuss., 14, 23847-23889, 2014 AbstractDiscussion Paper (PDF, 2969 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
16 Sep 2014
Simulation of the isotopic composition of stratospheric water vapour – Part 1: Description and evaluation of the EMAC model
Ozone distributions over southern Lake Michigan: comparisons between ferry-based observations, shoreline-based DOAS observations and air quality forecast models
P. A. Cleary, N. Fuhrman, L. Schulz, J. Schafer, J. Fillingham, H. Bootsma, T. Langel, E. J. Williams, and S. S. Brown Atmos. Chem. Phys. Discuss., 14, 23201-23236, 2014 AbstractDiscussion Paper (PDF, 1986 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
10 Sep 2014
Determination of interfacial parameters of a soluble particle in a nonideal solution from measured deliquescence and efflorescence humidities
Evaluation of a regional air quality model using satellite column NO2: treatment of observation errors and model boundary conditions and emissions
R. J. Pope, M. P. Chipperfield, N. H. Savage, C. Ordóñez, L. S. Neal, L. A. Lee, S. S. Dhomse, and N. A. D. Richards Atmos. Chem. Phys. Discuss., 14, 21749-21784, 2014 AbstractDiscussion Paper (PDF, 2986 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for ACP
26 Aug 2014
A multi-model evaluation of aerosols over South Asia: Common problems and possible causes
X. Pan, M. Chin, R. Gautam, H. Bian, D. Kim, P. R. Colarco, T. L. Diehl, T. Takemura, L. Pozzoli, K. Tsigaridis, S. Bauer, and N. Bellouin Atmos. Chem. Phys. Discuss., 14, 19095-19147, 2014 AbstractDiscussion Paper (PDF, 10439 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for ACP
22 Jul 2014
Dicarboxylic acids, ketocarboxylic acids, α-dicarbonyls, fatty acids and benzoic acid in PM2.5 aerosol collected during CAREBeijing-2007: an effect of traffic restriction on air quality