References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-9-15959-2009

The chemistry of OH and HO2 radicals in the boundary layer over the tropical Atlantic Ocean

Whalley

L. K.

¹ Furneaux

K. L.

¹ Goddard

¹ Lee

J. D.

² Mahajan

¹ Oetjen

¹ Read

K. A.

² Kaaden

³ Carpenter

L. J.

² Lewis

A. C.

² Plane

J. M. C.

¹ Saltzman

E. S.

⁴ Wiedensohler

³ Heard

D. E.

School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK

Chemistry Department, University of York, Heslington, YO10 5DD, UK

Physics Department, Leibniz Institute for Tropospheric Research, Leipzig, Germany

Department of Earth System Science, University of California, Irvine, CA, USA

28 07 2009

9 4 15959 16009

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Fluorescence Assay by Gas Expansion (FAGE) has been used to detect ambient levels of OH and HO2 radicals at the Cape Verde Atmospheric Observatory, located in the tropical Atlantic marine boundary layer, during May and June 2007. Midday radical concentrations were high, with maximum concentrations of 9×106 molecule cm−3 and 6×108 molecule cm−3 observed for OH and HO2, respectively. A box model incorporating the detailed Master Chemical Mechanism, extended to include halogen chemistry, and constrained by all available measurements including halogen and nitrogen oxides, has been used to assess the chemical and physical parameters controlling the radical chemistry. IO and BrO, although present only at a few pptv, constituted ~23% of the instantaneous sinks for HO2. Modelled HO2 was sensitive to both HCHO concentration and the rate of heterogeneous loss to the ocean surface and aerosols. However, a unique combination of these parameters could not be found that gave optimised (to within 15%) agreement during both the day and night. The results imply a missing nighttime source of HO2. The model underpredicted the daytime (sunrise to sunset) OH concentration by 12%. Photolysis of HOI and HOBr accounted for ~13% of the instantaneous rate of OH formation. Taking into account that halogen oxides increase the oxidation of NOx (NO→NO2), and in turn reduce the rate of formation of OH from the reaction of HO2 with NO, OH concentrations were estimated to be 10% higher overall due to the presence of halogens. The increase in modelled OH from halogen chemistry gives an estimated 10% shorter lifetime for methane in this region, and the inclusion of halogen chemistry is necessary to model the observed daily cycle of ozone destruction that is observed at the surface. Due to surface losses, we hypothesise that HO2 concentrations increase with height and therefore contribute a larger fraction of the ozone destruction than at the surface.

References 1

Abbatt, J. P. D. and Waschewsky, G. C. G.: Heterogeneous interactions of HOBr, HNO3, O3, and NO2 with deliquescent NaCl aerosols at room temperature, J. Phys. Chem. A., 102, 3719–3725, 1998.

Alicke, B., Hebestreit, K., Stutz, J., and Platt, U.: Iodine oxide in the marine boundary layer, Nature, 397, 572–573, 1999.

Allan, B. J., McFiggans, G., Plane, J. M. C., and Coe, H.: Observations of iodine monoxide in the remote marine boundary layer, J. Geophys. Res.-Atmos., 105, 14363–14369, 2000.

Allan, J. D., Topping, D. O., Good, N., Irwin, M., Flynn, M., Williams, P. I., Coe, H., Baker, A. R., Martino, M., Kaaden, N., Wiedensohler, A., Lehmann, S., Müller, K., Herrmann, H., and McFiggans, G. B.: Composition and properties of aerosols in the eastern Atlantic and impacts on gas phase uptake rates, Atmos. Chem. Phys. Discuss., in preparation, 2009.

Ayers, G. P., Penkett, S. A., Gillett, R. W., Bandy, B., Galbally, I. E., Meyer, C. P., Elsworth, C. M., Bentley, S. T., and Forgan, B. W.: The annual cycle of peroxides and ozone in marine air at Cape Grim, Tasmania, J. Atmos. Chem., 23, 221–252, 1996.

Bielski, B. H. J.: Re-Evaluation of Spectral and Kinetic-Properties of HO2 and O$_2^-$ Free-Radicals, Photochem. Photobiol., 28, 645–649, 1978.

Bloss, W. J., Evans, M. J., Lee, J. D., Sommariva, R., Heard, D. E., and Pilling, M. J.: The oxidative capacity of the troposphere: Coupling of field measurements of OH and a global chemistry transport model, Faraday Discuss., 130, 425–436, 2005a.

Bloss, W. J., Lee, J. D., Johnson, G. P., Sommariva, R., Heard, D. E., Saiz-Lopez, A., Plane, J. M. C., McFiggans, G., Coe, H., Flynn, M., Williams, P., Rickard, A. R., and Fleming, Z. L.: Impact of halogen monoxide chemistry upon boundary layer OH and HO2 concentrations at a coastal site, Geophys. Res. Lett., 32, L06814, doi:10.1029/2004GL022084, 2005b.

Bloss, W. J., Lee, J. D., Heard, D. E., Salmon, R. A., Bauguitte, S. J. B., Roscoe, H. K., and Jones, A. E.: Observations of OH and HO2 radicals in coastal Antarctica, Atmos. Chem. Phys., 7, 4171–4185, 2007.

Brasseur, G. P., Hauglustaine, D. A., Walters, S., Rasch, P. J., Muller, J. F., Granier, C., and Tie, X. X.: MOZART, a global chemical transport model for ozone and related chemical tracers 1. Model description, J. Geophys. Res.-Atmos., 103, 28265–28289, 1998.

Brauers, T., Hausmann, M., Bister, A., Kraus, A., and Dorn, H. P.: OH radicals in the boundary layer of the Atlantic Ocean 1. Measurements by long-path laser absorption spectroscopy, J. Geophys. Res.-Atmos., 106, 7399–7414, 2001.

Bridier, I., Caralp, F., Loirat, H., Lesclaux, R., Veyret, B., Becker, K. H., Reimer, A., and Zabel, F.: Kinetic and theoretical studies of the reactions CH3C(O)O2+NO2+M<CH3C(O)O2NO2+M between 248 and 393 K and between 30–760 torr, J. Phys. Chem., 95, 3594–3600, 1991.

Cantrell, C. A., Edwards, G. D., Stephens, S., Mauldin, R. L., Zondlo, M. A., Kosciuch, E., Eisele, F. L., Shetter, R. E., Lefer, B. L., Hall, S., Flocke, F., Weinheimer, A., Fried, A., Apel, E., Kondo, Y., Blake, D. R., Blake, N. J., Simpson, I. J., Bandy, A. R., Thornton, D. C., Heikes, B. G., Singh, H. B., Brune, W. H., Harder, H., Martinez, M., Jacob, D. J., Avery, M. A., Barrick, J. D., Sachse, G. W., Olson, J. R., Crawford, J. H., and Clarke, A. D.: Peroxy radical behavior during the Transport and Chemical Evolution over the Pacific (TRACE-P) campaign as measured aboard the NASA P-3B aircraft, J. Geophys. Res.-Atmos., 108(D6), 8371, doi:10.1029/2002JD002715, 2003.

Carpenter, L. J., Monks, P. S., Bandy, B. J., Penkett, S. A., Galbally, I. E., and Meyer, C. P.: A study of peroxy radicals and ozone photochemistry at coastal sites in the northern and southern hemispheres, J. Geophys. Res.-Atmos., 102, 25417–25427, 1997.

Carpenter, L. J., Sturges, W. T., Penkett, S. A., Liss, P. S., Alicke, B., Hebestreit, K., and Platt, U.: Short-lived alkyl iodides and bromides at Mace Head, Ireland: Links to biogenic sources and halogen oxide production, J. Geophys. Res.-Atmos., 104, 1679–1689, 1999.

Carpenter, L. J., Lewis, A. C., Hopkins, J. R., Read, K. A., Longley, I. D., and Gallagher, M. W.: Uptake of methanol to the North Atlantic Ocean surface, Global Biogeochem. Cy., 18, GB4027, doi:10.1029/2004GB002294, 2004.

Chameides, W. L. and Davis, D.: Iodine – its possible role in tropospheric photochemistry, J. Geophys. Res.-Atmos., 85, 7383–7398, 1980.

Chang, W., Heikes, B., and Lee, M.: Ozone deposition to the sea surface: chemical enhancement and wind speed dependence, Atmos. Environ., 38, 1053–1059, 2004.

Chen, G., Davis, D., Crawford, J., Heikes, B., O'Sullivan, D., Lee, M., Eisele, F., Mauldin, L., Tanner, D., Collins, J., Barrick, J., Anderson, B., Blake, D., Bradshaw, J., Sandholm, S., Carroll, M., Albercook, G., and Clarke, A.: An assessment of HOx chemistry in the Tropical Pacific Boundary Layer: Comparison of model simulations with observations recorded during PEM Tropics A, J. Atmos. Chem., 38, 317–344, 2001.

Commane, R., Bale, C. S. E., Furneaux, K. L., Ingham, T., Whalley, L. K., Heard, D. E., and Bloss, W. J.: Impacts of iodine monoxide in the marine boundary layer, EGU General Assembly, Vienna, 2008,

Curtis, A. R. and Sweetenham, W. P.: FACSIMILE/CHEKMAT users manual, in: Her majesty's stn. off., edited by: AERER12805, Norwich, England, 1987.

Dickerson, R. R., Rhoads, K. P., Carsey, T. P., Oltmans, S. J., Burrows, P. J., and Crutzen, P. J.: Ozone in the remote marine boundary layer: A possible role for halogens, J. Geophys. Res.-Atmos., 104, 21385–21395, 1999.

Fairall, C. W., Hare, J. E., Edson, J. B., and McGillis, W.: Parameterization and micrometeorological measurement of air-sea gas transfer, Bound.-Lay. Meteorol., 96, 63–105, 2000.

Fairall, C. W., Helmig, D., Ganzeveld, L., and Hare, J.: Water-side turbulence enhancement of ozone deposition to the ocean, Atmos. Chem. Phys., 7, 443–451, 2007.

Fleming, Z. L., Monks, P. S., Rickard, A. R., Heard, D. E., Bloss, W. J., Seakins, P. W., Still, T. J., Sommariva, R., Pilling, M. J., Morgan, R., Green, T. J., Brough, N., Mills, G. P., Penkett, S. A., Lewis, A. C., Lee, J. D., Saiz-Lopez, A., and Plane, J. M. C.: Peroxy radical chemistry and the control of ozone photochemistry at Mace Head, Ireland during the summer of 2002, Atmos. Chem. Phys., 6, 2193–2214, 2006.

Galbally, I. E., Bentley, S. T., and Meyer, C. P.: Mid-latitude marine boundary layer ozone destruction at visible sunrise observed at Cape Grim, Tasmania, 41 degrees S, Geophys. Res. Lett., 27(23), 3841–3844, 2000.

Gallagher, M. S., Carsey, T. P., and Farmer, M. L.: Peroxyacetyl nitrate in the north Atlantic marine boundary layer, Global Biogeochem. Cy., 4, 297–308, 1990.

Ganzeveld, L. and Lelieveld, J.: Dry Deposition Parameterization in a Chemistry General-Circulation Model and Its Influence on the Distribution of Reactive Trace Gases, J. Geophys. Res.-Atmos., 100, 20999–21012, 1995.

Haggerstone, A.-L., Carpenter, L. J., Carslaw, N., and McFiggans, G.: Improved model predictions of HO2 with gas to particle mass transfer rates calculated using aerosol number size distribution, J. Geophys. Res.-Atmos., 110, D04304, doi:10.1029/2004JD005282, 2005.

Heard, D. E. and Pilling, M. J.: Measurement of OH and HO2 in the Tropopshere, Chem. Rev., 103, 5163–5198, 2003.

Hoell, J. M., Davis, D., Liu, S., Newell, R. E., Shipman, M., Akimoto, H., McNeal, R. J., Bendura, R. J., and Drewry, J. W.: Pacific Exploratory Mission-West A (PEM-West A) September–October 1991, J. Geophys. Res.-Atmos., 101, 1641–1653, 1996.

Hoell, J. M., Davis, D., Liu, S., Newell, R. E., Akimoto, H., McNeal, R. J., and Bendura, R. J.: The Pacific Exploratory Mission-West Phase B: February–March 1994, J. Geophys. Res.-Atmos., 102, 28223–28239, 1997.

Hoell, J. M., Davis, D., Jacob, D. J., Rodgers, M. O., Newell, R. E., Fuelberg, H. E., McNeal, R. J., Raper, J. L., and Bendura, R. J.: Pacific Exploratory Mission in the tropical Pacific: PEM-Tropics A, August-September 1996, J. Geophys. Res.-Atmos., 104, 5567–5583, 1999.

Hough, A. M.: The calculation of photolysis rates for use in global tropospheric modelling studies, AERE rep., Her Majesty's Stn. Off., Norwich, 1988.

IUPAC: http://www.iupac-kinetic.ch.cam.ac.uk/, 2006.

Jacobi, H.-W., Weller, R., Bluszcz, T., and Schrems, O.: Latitudinal distribution of peroxyacetyl nitrate (PAN) over the Atlantic ocean, J. Geophys. Res.-Atmos., 104, 26901–26912, 1999.

Junkermann, W. and Stockwell, W. R.: On the budget of photooxidants in the marine boundary layer of the tropical South Atlantic, J. Geophys. Res.-Atmos., 104, 8039–8046, 1999.

Kanaya, Y., Cao, R., Kato, S., Miyakawa, Y., Kajii, Y., Tanimoto, H., Yokouchi, Y., Mochida, M., Kawamura, K., and Akimoto, H.: Chemistry of OH and HO2 radicals observed at Rishiri Island, Japan, in September 2003: Missing daytime sink of HO2 and positive nighttime correlations with monoterpenes, J. Geophys. Res.-Atmos., 112, D11308, doi:10.1029/2006JD007987, 2007.

Keene, W. C., Long, M. S., Pszenny, A. A. P., Sander, R., Maben, J. R., Wall, A. J., O'Halloran, T. L., Kerkweg, A., Fischer, E. V., and Schrems, O.: Latitudinal variation in the multiphase chemical processing of inorganic halogens and related species over the eastern North and South Atlantic Oceans, Atmos. Chem. Phys. Discuss., 9, 11889–11950, 2009.

Lee, J. D., McFiggans, G., Allan, J. D., Carpenter, L. J., Jones, C. E., Lewis, A. C., Methven, J., Moller, S. J., and Read, K. A.: Reactive Halogens in the Marine Boundary Layer (RHaMBLe) – overview of measurements in the tropical North Atlantic Ocean, Atmos. Chem. Phys. Discuss., in preparation, 2009a.

Lee, J. D., Moller, S. J., Read, K. A., Lewis, A. C., Mendes, L., and Carpenter, L. J.: Year round measurements of nitrogen oxides and ozone in the tropical North Atlantic marine boundary layer, J. Geophys. Res.-Atmos., in review, 2009b.

Lelieveld, J., Crutzen, P. J., and Bruhl, C.: Climate effects of atmospheric methane, Chemosphere, 26, 739–768, 1993.

Leser, H., Honninger, G., and Platt, U.: MAX-DOAS measurements of BrO and NO2 in the marine boundary layer, Geophys. Res. Lett., 30, 1537, doi:10.1029/2002GL015811, 2003.

Levy, H.: Normal atmosphere: Large radical and formaldehyde concentrations predicted, Science, 173, 141–143, 1971.

Mauldin III, R. L., Tanner, D., and Eisele, F.: Measurements of OH during PEM-Tropics A, J. Geophys. Res.-Atmos., 104, 5817–5827, 1999.

Mauldin III, R. L., Eisele, F., Cantrall, C., Kosciuch, E., Ridley, B. A., Lefer, B., Tanner, D., Nowak, J. B., Chen, G., Wang, L., and Davis, D.: Measurements of OH aboard the NASA P-3 during PEM-Tropics B, J. Geophys. Res.-Atmos., 106, 32657–32666, 2001.

MCM: Master Chemical Mechanism, Version 3.1, http://mcm.leeds.ac.uk/MCM/home, last access:7 July 2009.

Monks, P. S., Carpenter, L. J., Penkett, S. A., Ayers, G. P., Gillett, R. W., Galbally, I. E., and Meyer, C. P.: Fundamental ozone photochemistry in the remote marine boundary layer: The SOAPEX experiment, measurement and theory, Atmos. Environ., 32, 3647–3664, 1998.

Moore, R., Oram, D., and Penkett, S. A.: Production of isoprene by marine phytoplankton cultures, Geophys. Res. Lett., 21, 2507–2510, 1994.

Mossinger, J. C. and Cox, R. A.: Heterogeneous reaction of HOI with sodium halide salts, J. Phys. Chem. A., 105, 5165–5177, 2001.

Pechtl, S., Schmitz, G., and Von Glasow, R.: Modelling iodide-iodate speciation in atmospheric aerosol: Contributions of inorganic and organic iodine chemistry, Atmos. Chem. Phys., 7, 1381–1393, 2007.

Penkett, S. A., Monks, P. S., Carpenter, L. J., Clemitshaw, K. C., Ayers, G. P., Gillett, R. W., Galbally, I. E., and Meyer, C. P.: Relationship between ozone photolysis rates and peroxy radical concentrations in clean marine air over the Southern Ocean, J. Geophys. Res.-Atmos., 102, 12805–12817, 1997.

Plane, J. M. C. and Saiz-Lopez, A.: UV-Visible Differential Optical Absorption Spectroscopy (DOAS), in: Analytical Techniques for Atmospheric Measurements, edited by: Heard, D. E., Blackwell Publishing, 147–180, 2006.

Poppe, D.: Time constant analysis of tropospheric gas-phase chemistry, Phys. Chem. Chem. Phys., 1, 5417–5422, 1999.

Raper, J. L., Kleb, M. M., Jacob, D. J., Davis, D., Newell, R. E., Fuelberg, H. E., Bendura, R. J., Hoell, J. M., and McNeal, R. J.: Pacific Exploratory Mission in the Tropical Pacific: PEM-Tropics B, March-April 1999, J. Geophys. Res.-Atmos., 106, 32401–32425, 2001.

Ravishankara, A. R.: Heterogeneous and multiphase chemistry in the troposphere, Science, 276, 1058–1065, 1997.

Read, K. A., Mahajan, A. S., Carpenter, L. J., Evans, M. J., Faria, B. V. E., Heard, D. E., Hopkins, J. R., Lee, J. D., Moller, S. J., Lewis, A. C., Mendes, L., McQuaid, J. B., Oetjen, H., Saiz-Lopez, A., Pilling, M. J., and Plane, J. M. C.: Extensive halogen-mediated ozone destruction over the tropical Atlantic Ocean, Nature, 453, 1232–1235, 2008.

Read, K. A., Lee, J. D., Lewis, A. C., Moller, S. J., Neves, L. M., and Carpenter, L. J.: Intra-annual cycles of NMVOC in the tropical marine boundary layer and their use for interpreting seasonal variability in CO, J. Geophys. Res.-Atmos., doi:10.1029/2009JD011879R, in review, 2009.

Saiz-Lopez, A. and Plane, J. M. C.: Novel iodine chemistry in the marine boundary layer, Geophys. Res. Lett., 31, L04112, doi:10.1029/2003GL09215, 2004.

Saiz-Lopez, A., Plane, J. M. C., and Shillito, J.: Bromine oxide in the mid-latitude marine boundary layer, Geophys. Res. Lett., 31, L03111, doi:10.1029/2003GL018956, 2004.

Salisbury, G., Rickard, A. R., Monks, P. S., Allan, B. J., Bauguitte, S., Penkett, S. A., Carslaw, N., Lewis, A. C., Creasey, D. J., Heard, D. E., Jacobs, P. J., and Lee, J. D.: Production of peroxy radicals at night via reactions of ozone and the nitrate radical in the marine boundary layer, J. Geophys. Res.-Atmos., 106, 12669–12687, 2001.

Sander, R.: Modeling atmospheric chemistry: interactions between gas-phase species and liquid cloud/aerosols particles, Surv. Geophys., 20, 1–31, 1999.

Saunders, S., Jenkin, M., Derwent, R., and Pilling, M. J.: Protocol for the development of the Master Chemical Mechanism, MCM v3 (part A): Tropospheric degradation of non-aromatic volatile organic compounds, Atmos. Chem. Phys., 3, 161–180, 2003.

Schwartz, S. E.: Gas-Phase and Aqueous-Phase Chemistry of HO2 in Liquid Water Clouds, J. Geophys. Res.-Atmos., 89, 1589–1598, 1984.

Shaw, S. L., Chisholm, S. W., and Prinn, R. G.: Isoprene production by Prochlorococcus, a marine cyanobacterium and other phytoplankton, Mar. Chem., 80(4), 227–245, 2003.

Smith, S. C., Lee, J. D., Bloss, W. J., Johnson, G. P., Ingham, T., and Heard, D. E.: Concentrations of OH and HO2 radicals during NAMBLEX: measurements and steady state analysis, Atmos. Chem. Phys., 6, 1435–1453, 2006.

Smith, S. C.: Atmospheric measurements of OH and HO2 using the FAGE technique: Instrument development and data analysis, University of Leeds, 2007.

Sommariva, R., Haggerstone, A.-L., Carpenter, L. J., Carslaw, N., Creasey, D. J., Heard, D. E., Lee, J. D., Lewis, A. C., Pilling, M. J., and Zador, J.: OH and HO2 chemistry in clean marine air during SOAPEX-2, Atmos. Chem. Phys., 4, 839–856, 2004.

Sommariva, R., Bloss, W. J., Brough, N., Carslaw, N., Flynn, M., Haggerstone, A.-L., Heard, D. E., Hopkins, J. R., Lee, J. D., Lewis, A. C., McFiggans, G., Monks, P. S., Penkett, S. A., Pilling, M. J., Plane, J. M. C., Read, K. A., Saiz-Lopez, A., Rickard, A. R., and Williams, P. I.: OH and HO2 chemistry during NAMBLEX: roles of oxygenates, halogen oxides and heterogeneous uptake, Atmos. Chem. Phys., 6, 1135–1153, 2006.

Stull, R. B.: Introduction to Boundary Layer Meteorology, edited by: Publishers, K. A., Dordrecht, 1988.

Taketani, F., Kanaya, Y., and Akimoto, H.: Kinetcis of heterogeneous reactions of HO2 radical at ambient concentration levels with (NH$_4)_2$SO4 and NaCl aerosol particles, J. Phys. Chem. A., 112, 2370–2377, 2008.

Taketani, F., Kanaya, Y., and Akimoto, H.: Heterogeneous loss of HO2 by KCl, synthetic sea salt, and natural seawater aerosol particles, Atmos. Environ., 43, 1660–1665, 2009.

Thornton, J. A., Jaegle, L., and McNeill, V. F.: Assessing known pathways for HO2 loss in aqueous atmospheric aerosols: Regional and global impacts on tropospheric oxidants, J. Geophys. Res.-Atmos., 113, D05303, doi:10.1029/2007JD009236, 2008.

Vogt, R., Crutzen, P. J., and Sander, R.: A mechanism for halogen release from sea-salt aerosol in the remote marine boundary layer, Nature, 383, 327–330, 1996.

Vogt, R., Sander, R., von Glasow, R., and Crutzen, P. J.: Iodine chemistry and its role in halogen activation and ozone loss in the marine boundary layer: A model study, J. Atmos. Chem., 32, 375–395, 1999.

von Glasow, R. and Sander, R.: Variation of sea salt aerosol pH with relative humidity, Geophys. Res. Lett., 28, 247–250, 2001.

von Glasow, R., Sander, R., Bott, A., and Crutzen, P. J.: Modelling halogen chemistry in the marine boundary layer- 1. Cloud-free MBL, J. Geophys. Res.-Atmos., 107, 4341, doi:10.1029/2001JD000942, 2002a.

von Glasow, R., Sander, R., Bott, A., and Crutzen, P. J.: Modeling halogen chemistry in the marine boundary layer 1 Cloud-free MBL, J. Geophys. Res.-Atmos., 107, 4341, doi:10.1029/2001JD001133, 2002b.

von Glasow, R., von Kuhlmann, R., Lawrence, M. G., Platt, U., and Crutzen, P. J.: Impact of reactive bromine chemistry in the troposphere, Atmos. Chem. Phys., 4, 2481–2497, 2004.

Wachsmuth, M., Gaggeler, H. W., von Glasow, R., and Ammann, M.: Accommodation coefficient of HOBr on deliquescent sodium bromide aerosol particles, Atmos. Chem. Phys., 2, 121–131, 2002.

Weller, R., Schrems, O., Boddenberg, A., Gäb, S., and Gautrois, M.: Meridional distribution of hydroperoxides and formaldehyde in the marine boundary layer of the Atlantic (48° N–35° S) measured during the Albatross campaign, J. Geophys. Res.-Atmos., 105, 14401–14412, 2000.

Whalley, L. K., Furneaux, K. L., Gravestock, T., Atkinson, H. M., Bale, C. S. E., Ingham, T., Bloss, W. J., and Heard, D. E.: Detection of iodine monoxide radicals in the marine boundary layer using laser induced fluorescence spectroscopy, J. Atmos. Chem., 58, 19–39, 2007.