References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-1891-2011

Characterization and source apportionment of submicron aerosol with aerosol mass spectrometer during the PRIDE-PRD 2006 campaign

Xiao

¹ Takegawa

² Zheng

¹ Kondo

² Miyazaki

² ³ Miyakawa

² Hu

¹ Shao

¹ Zeng

¹ Gong

⁴ Lu

¹ Deng

¹ Zhao

⁵ Zhang

Y. H.

State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China

Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan

Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan

Research Institute of Chemical Defence, Beijing, China

Air Quality Research Center, University of California, Davis, California, USA

19 01 2011

11 1 1891 1937

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Size-resolved chemical compositions of non-refractory submicron aerosol were measured using an Aerodyne quadrupole aerosol mass spectrometer (Q-AMS) at the rural site Back Garden (BG), located ~50 km northwest of Guangzhou in July 2006. This paper characterized the submicron aerosol particles of regional air pollution in Pearl River Delta (PRD) in the Southern China. Organics and sulfate dominated the submicron aerosol compositions, with average mass concentrations of 11.8±8.4 μg m−3 and 13.5±8.7 μg m−3, respectively. Unlike other air masses, the air masses originated from Southeast-South and passing through the PRD urban areas exhibited distinct bimodal size distribution characteristics for both organics and sulfate: the first mode peaked at vacuum aerodynamic diameters (Dva)~200 nm and the second mode occurred at Dva from 300–700 nm. With the information from AMS, it was found from this study that the first mode of organics in PRD regional air masses was contributed by both secondary organic aerosol formation and combustion-related emissions, which is different from most findings in other urban areas (first mode of organics primarily from combustion-related emissions). The analysis of AMS mass spectra data by positive matrix factorization (PMF) model identified three sources of submicron organic aerosol including hydrocarbon-like organic aerosol (HOA), low volatility oxygenated organic aerosol (LV-OOA) and semi-volatile oxygenated organic aerosol (SV-OOA). The strong correlation between HOA and EC indicated primary combustion emissions as the major source of HOA while a close correlation between SV-OOA and semi-volatile secondary species nitrate as well as between LV-OOA and nonvolatile secondary species sulfate suggested secondary aerosol formation as the major source of SV-OOA and LV-OOA at the BG site. However, LV-OOA was more aged than SV-OOA as its spectra was highly correlated with the reference spectra of fulvic acid, an indicator of aged and oxygenated aerosol. The origin of HOA and OOA (the sum of LV-OOA and SV-OOA) has been further confirmed by the statistics that primary organic carbon (POC) and secondary organic carbon (SOC), estimated by the EC tracer method, were closely correlated with HOA and OOA, respectively. The results of the EC tracer method and of the PMF model revealed that primary organic aerosol (POA) constituted ~34–47% of OA mass and secondary organic aerosol (SOA) constituted ~53–66% of regional organic aerosol in PRD during summer reason. The presence of abundant SOA was consistent with water soluble organic carbon (WSOC) results (accounting for ~60% of OC on average) by Miyazaki et al. (2009) for the same campaign. OOA correlated well with WSOC at the BG site, indicating that most OOA were water soluble. More specifically, approximately 86% of LV-OOA and 61% of SV-OOA were estimated as water soluble species on the basis of carbon content comparison.

References 1

Alfarra,~M R., Coe,~H., Allan,~J D., Bower,~K N., Boudries,~H., Canagaratna,~M R., Jimenez,~J L., Jayne,~J T., Garforth,~A., Li,~S M., and Worsnop,~D R.: Characterization of urban and regional organic aerosols in the lower Fraser Valley using two Aerodyne aerosol mass spectrometers, Atmos. Environ., 38, 5745–5758, 2004.

Alfarra,~M R., Prevot,~A S H., Szidat,~S., Sandradewi,~J., Weimer,~S., Lanz,~V A., Schreiber,~D., Mohr,~M., and Baltensperger,~U.: Identification of the mass spectral signature of organic aerosols from wood burning emissions, Environ. Sci. Technol., 41, 5770–5777, 2007.

Allan,~J D., Alfarra,~M R., Bower,~K N., Williams,~P I., Gallagher,~M W., Jimenez,~J L., McDonald,~A G., Nemitz,~E., Canagaratna,~M R., Jayne,~J T., Coe,~H., and Worsnop,~D R.: Quantitative sampling using an aerodyne aerosol mass spectrometer, 2 Measurements of fine particulate chemical composition in two UK cities, J Geophys. Res., 108(D3), 4091, \doi10.1029/2002JD002359, 2003a.

Allan,~J D., Jimenez,~J L., Williams,~P I., Alfarra,~M R., Bower,~K N., Jayne,~J T., Coe,~H., and Worsnop,~D R.: Quantitative sampling using an aerodyne aerosol mass spectrometer, 1 Techniques of data interpretation and error analysis, J Geophys. Res., 108(D3), 4090, \doi10.1029/2002JD002358, 2003b.

Allan,~J D., Bower,~K N., Coe,~H., Boudries,~H., Jayne,~J T., Canagaratna,~M R., Millet,~D B., Goldstein,~A H., Quinn,~P K., Weber,~R J., and Worsnop,~D R.: Submicron aerosol composition at Trinidad Head, California, during ITCT 2K2: its relationship with gas phase volatile organic carbon and assessment of instrument performance, J Geophys. Res., 109, D23S24, \doi10.1029/2003JD004208, 2004.

Cabada,~J C., Pandis,~S N., and Robinson,~A L.: Sources of atmospheric carbonaceous particulate matter in Pittsburgh, Pennsylvania, J Air Waste Manage., 52, 6, 732–741, 2002.

Cabada,~J C., Pandis,~S N., Subramanian,~R., Robinson,~A L., Polidori,~A., and Turpin,~B.: Estimating the secondary organic aerosol contribution to \chemPM_2.5 using the EC tracer method, Aerosol Sci. Technol., 38(S1), 140–155, 2004.

Cao,~J J., Lee,~S C., Ho,~K F., Zhang,~X Y., Zou,~S C., Fung,~K., Chow,~J C., and Watson,~J G.: Characteristics of carbonaceous aerosol in Pearl River Delta Region, China during 2001 winter period, Atmos. Environ., 37, 1451–1460, 2003.

Cao,~J J., Lee,~S C., Ho,~K F., Zou,~S C., Fung,~K., Li,~Y., Watson,~J G., and Chow,~J C.: Spatial and seasonal variations of atmospheric organic carbon and elemental carbon in Pearl River Delta Region, China, Atmos. Environ., 38, 4447–4456, 2004.

Cheng,~Y F., Eichler,~H., Wiedensohler,~A., Heintzenberg,~J., Zhang,~Y H., Hu,~M., Herrmann,~H., Zeng,~L M., Liu,~S., Gnauk,~T., Bruggemann,~E., and He,~L Y.: Mixing state of elemental carbon and non-light-absorbing aerosol components derived from in situ particle optical properties at Xinken in Pearl River Delta of China, J Geophys. Res., 111, D20204, \doi10.1029/2005JD006929, 2006.

Cheng,~Y F., Wiedensohler,~A., Eichler,~H., Heintzenberg,~J., Su,~H., Gnauk,~T., Bruggemann,~E., Herrmann,~H., Slanina,~J., Zeng,~L M., Tuch,~T., Liu,~S., and Zhang,~Y H.: Aerosol optical properties and related chemical apportionment at Xinken in Pearl River Delta of China, Atmos. Environ., 42(25), 6351–6372, 2008.

Dechapanya,~W., Russell,~M., and Allen,~D T.: Estimates of anthropogenic secondary organic aerosol formation in Houston, Texas, Aerosol Sci. Technol., 38(S1), 156–166, 2004.

Fan,~S., Fan,~Q., Yu,~W., Luo,~X Y., Wang,~B., Song,~L., and Leong, K. L.: Atmospheric boundary layer characteristics over the Pearl River Delta – China during summer 2006: measurement and model results, Atmos. Chem. Phys. Discuss., accepted, 2010.

Hagler,~G S W., Bergin,~M H., Salmon,~L G., Yu,~J Z., Wan,~E C H., Zheng,~M., Zeng,~L M., Kiang,~C S., Zhang,~Y H., Lau,~A K H., and Schauer,~J J.: Source areas and chemical composition of fine particulate matter in the Pearl River Delta region of China, Atmos. Environ., 40, 3802–3815, 2006.

Hering,~S V. and Friedlander,~S K.: Origins of aerosol sulfur size distributions in the Los Angeles Basin, Atmos. Environ., 16(11), 2647–2656, 1982.

Hering,~S V., Eldering,~A., and Seinfeld,~J H.: Bimodal character of accumulation mode aerosol mass distributions in Southern California, Atmos. Environ., 31(1), 1–11, 1997.

Hofzumahaus,~A., Rohrer,~F., Lu,~K., Bohn,~B., Brauers,~T., Chang,~C C., Fuchs,~H., Holland,~F., Kita,~K., Kondo,~Y., Li,~X., Lou,~S., Shao,~M., Zeng,~L M., Wahner,~A., Zhang,~Y H.: Amplified trace gas removal in the troposphere, Science, 324, 5935, 1702–1704, \doi10.1126/science.1164566, 2009.

Hua,~W., Chen,~Z M., Jie,~C Y., Kondo,~Y., Hofzumahaus,~A., Takegawa,~N., Chang,~C C., Lu,~K D., Miyazaki,~Y., Kita,~K., Wang,~H L., Zhang,~Y H., and Hu,~M.: Atmospheric hydrogen peroxide and organic hydroperoxides during PRIDE-PRD'06, China: their concentration, formation mechanism and contribution to secondary aerosols, Atmos. Chem. Phys., 8, 6755–6773, \doi10.5194/acp-8-6755-2008, 2008.

Jayne,~J T., Leard,~D C., Zhang,~X., Davidovits,~P., Smith,~K A., Kolb,~C E., and Worsnop,~D R.: Development of an aerosol mass spectrometer for size and composition analysis of submicron particles, Aerosol Sci. Technol., 33, 49–70, 2000.

Jimenez,~J L., Jayne,~J T., Shi,~Q., Kolb,~C E., Worsnop,~D R., Yourshaw,~I., Seinfeld,~J H., Flagan,~R C., Zhang,~X F., Smith,~K A., Morris,~J W., and Davidovits,~P.: Ambient aerosol sampling using the aerodyne aerosol mass spectrometer, J Geophys. Res., 108(D7), 8425, \doi10.1029/2001JD001213, 2003.

Jimenez,~J L., Canagaratna,~M R., Donahue,~N M., Prevot,~A S H., Zhang,~Q., Kroll,~J H., DeCarlo,~P F., Allan,~J D., Coe,~H., Ng,~N L., Aiken,~A C., Docherty,~K S., Ulbrich,~I M., Grieshop,~A P., Robinson,~A L., Duplissy,~J., Smith,~J D., Wilson,~K R., Lanz,~V A., Hueglin,~C., Sun,~Y L., Tian,~J., Laaksonen,~A., Raatikainen,~T., Rautiainen,~J., Vaattovaara,~P., Ehn,~M., Kulmala,~M., Tomlinson,~J M., Collins,~D R., Cubison,~M J., Dunlea,~E J., Huffman,~J A., Onasch,~T B., Alfarra,~M R., Williams,~P I., Bower,~K., Kondo,~Y., Schneider,~J., Drewnick,~F., Borrmann,~S., Weimer,~S., Demerjian,~K., Salcedo,~D., Cottrell,~L., Griffin,~R., Takami,~A., Miyoshi,~T., Hatakeyama,~S., Shimono,~A., Sun,~J Y., Zhang,~Y M., Dzepina,~K., Kimmel,~J R., Sueper,~D., Jayne,~J T., Herndon,~S C., Trimborn,~A M., Williams,~L R., Wood,~E C., Middlebrook,~A M., Kolb,~C E., Baltensperger,~U., and Worsnop,~D R.: Evolution of organic aerosols in the atmosphere, Science, 326, 1525, \doi10.1126/science.1180353, 2009.

Kondo,~Y., Miyazaki,~Y., Takegawa,~N., Miyakawa,~T., Weber,~R J., Jimenez,~J L., Zhang,~Q., and Worsnop,~D R.: Oxygenated and water-soluble organic aerosols in Tokyo, J Geophys. Res., 112, D01203, \doi10.1029/2006JD007056, 2007.

Lanz,~V A., Alfarra,~M R., Baltensperger,~U., Buchmann,~B., Hueglin,~C., and Prévôt,~A S H.: Source apportionment of submicron organic aerosols at an urban site by factor analytical modelling of aerosol mass spectra, Atmos. Chem. Phys., 7, 1503–1522, \doi10.5194/acp-7-1503-2007, 2007.

Lanz,~V A., Alfarra,~M R., Baltensperger,~U., Buchmann,~B., Hueglin,~C., Szidat,~S., Wehrli,~M N., Wacker,~L., Weimer,~S., Caseiro,~A., Puxbaum,~H., and Prevot,~A S H.: Source attribution of submicron organic aerosols during wintertime inversions by advanced factor analysis of aerosol mass spectra, Environ. Sci. Technol., 42, 214–220, \doi10.1021/es0707207, 2008.

Lee,~C S L. and Li,~X D.: Heavy metals and Pb isotopic composition of aerosols in urban and suburban areas of Hong Kong and Guangzhou, South China – evidence of the long-range transport of air contaminants, Atmos. Environ., 41(2), 432–447, 2007.

Li,~X., Brauers,~T., Shao,~M., Garland,~R M., Wagner,~T., Deutschmann,~T., and Wahner,~A.: MAX-DOAS measurements in southern China: retrieval of aerosol extinctions and validation using ground-based in-situ data, Atmos. Chem. Phys., 10, 2079–2089, \doi10.5194/acp-10-2079-2010, 2010.

Liu,~S., Hu,~M., Slanina,~S., He,~L., Niu,~Y., Bruegemann,~E., Gnauk,~T., and Herrmann,~H.: Size distribution and source analysis of ionic compositions of aerosols in polluted periods at Xinken in Pearl River Delta (PRD) of China, Atmos. Environ., 42, 6284–6295, 2008.

Liu,~X G., Cheng,~Y F., Zhang,~Y H., Jung,~J S., Sugimoto,~N., Chang,~S Y., Kim,~Y J., Fan,~S J., and Zeng,~L M.: Influences of relative humidity and particle chemical composition on aerosol scattering properties during the 2006 PRD campaign, Atmos. Environ., 42, 7, 1525–1536, 2008.

Lu,~K D., Zhang,~Y H., Su,~H., Shao,~M., Zeng,~L M., Zhong,~L J., Xiang,~Y R., Chang,~C C., Chou,~C K C., and Wahner,~A.: Regional ozone pollution and key controlling factors of photochemical ozone production in Pearl River Delta during summer time, Sci. China Chem., 53(3), 651–663, 2010.

McMurry,~P H.: A~review of atmospheric aerosol measurements, Atmos. Environ., 34, 12, 1959–1999, 2000.

Meng,~Z. and Seinfeld,~J H.: On the source of the submicrometer droplet mode of urban and regional aerosols, Aerosol Sci. Technol., 20(3), 253–265, 1994.

Middlebrook,~A M., Murphy,~D M., Lee,~S H., Thomson,~D S., Prather,~K A., Wenzel,~R J., Liu,~D Y., Phares,~D J., Rhoads,~K P., Wexler,~A S., Johnston,~M V., Jimenez,~J L., Jayne,~J T., Worsnop,~D R., Yourshaw,~I., Seinfeld,~J H., and Flagan,~R C.: An intercomparison of particle mass spectrometers during the 1999 Atlanta Supersite Project, J Geophys. Res., 108(D7), 8424, \doi10.1029/2001JD000660, 2003.

Miyakawa,~T., Takegawa,~N., and Kondo,~Y.: Photochemical evolution of submicron aerosol chemical composition in the Tokyo megacity in summer, J Geophys. Res., 113, D14304, \doi10.1029/2007JD009493, 2008.

Miyazaki,~Y., Kondo,~Y., Shiraiwa,~M., Takegawa,~N., Miyakawa,~T., Han,~S., Kita,~K., Hu,~M., Deng,~Z Q., Zhao,~Y., Sugimoto,~N., Blake,~D R., and Weber,~R J.: Chemical characterization of water-soluble organic carbon aerosols at a~rural site in the Pearl River Delta, China, in the summer of 2006, J Geophys. Res., 114, D14208, \doi10.1029/2009JD011736, 2009.

Paatero,~P.: Least squares formulation of robust non-negative factor analysis, Chemometr. Intell. Lab., 37, 23–35, 1997.

Paatero,~P. and Tapper,~U.: Positive matrix factorization: a~nonnegative factor model with optimal utilization of error estimates of data values, Environmetrics, 5, 111–126, 1994.

Rose,~D., Nowak,~A., Achtert,~P., Wiedensohler,~A., Hu,~M., Shao,~M., Zhang,~Y., Andreae,~M O., and Pöschl,~U.: Cloud condensation nuclei in polluted air and biomass burning smoke near the mega-city Guangzhou, China – Part~1: Size-resolved measurements and implications for the modeling of aerosol particle hygroscopicity and CCN activity, Atmos. Chem. Phys., 10, 3365–3383, \doi10.5194/acp-10-3365-2010, 2010.

Salcedo,~D., Onasch,~T B., Dzepina,~K., Canagaratna,~M R., Zhang,~Q., Huffman,~J A., DeCarlo,~P F., Jayne,~J T., Mortimer,~P., Worsnop,~D R., Kolb,~C E., Johnson,~K S., Zuberi,~B., Marr,~L C., Volkamer,~R., Molina,~L T., Molina,~M J., Cardenas,~B., Bernabé,~R M., Márquez,~C., Gaffney,~J S., Marley,~N A., Laskin,~A., Shutthanandan,~V., Xie,~Y., Brune,~W., Lesher,~R., Shirley,~T., and Jimenez,~J L.: Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite, Atmos. Chem. Phys., 6, 925–946, \doi10.5194/acp-6-925-2006, 2006.

Saxena,~P., Hildemann,~L M., McMurry,~P H., and Seinfeld,~J H.: Organics alter hygroscopic behavior of atmospheric particles, J Geophys. Res., 100, 18755–18770, 1995.

Seinfeld,~J H. and Pandis,~S N.: Atmospheric Chemistry and Physics, John Wiley & Sons, Inc., New Jersey, 2006.

Seinfeld,~J H. and Pankow,~J F.: Organic atmospheric particulate material, Annu. Rev. Phys. Chem., 54, 121–140, 2003.

Sun,~J., Zhang,~Q., Canagaratna,~M R., Zhang,~Y., Ng,~N L., Sun,~Y., Jayne,~J T., Zhang,~X., Zhang,~X., and Worsnop,~D R.: Highly time- and size-resolved characterization of submicron aerosol particles in Beijing using an Aerodyne aerosol mass spectrometer, Atmos. Environ., 44, 131–140, 2010.

Takami,~A., Miyoshi,~T., Shimono,~A., and Hatakeyama,~S.: Chemical composition of fine aerosol measured by AMS at Fukue Island, Japan during APEX period, Atmos. Environ., 39, 4913–4924, 2005.

Takegawa,~N., Miyazaki,~Y., Kondo,~Y., Komazaki,~Y., Miyakawa,~T., Jimenez,~J L., Jayne,~J T., Worsnop,~D R., Allan,~J D., and Weber,~R J.: Characterization of an aerodyne aerosol mass spectrometer (AMS): intercomparison with other aerosol instruments, Aerosol Sci. Technol., 39(8), 760–770, 2005.

Takegawa,~N., Miyakawa,~T., Kondo,~Y., Jimenez,~J L., Zhang,~Q., Worsnop,~D R., and Fukuda,~M.: Seasonal and diurnal variations of submicron organic aerosol in Tokyo observed using the Aerodyne aerosol mass spectrometer, J Geophys. Res., 111, D11206, \doi10.1029/2005JD006515, 2006.

Takegawa,~N., Miyakawa,~T., Watanabe,~M., Kondo,~Y., Miyazaki,~Y., Han,~S., Zhao,~Y., Pinxteren,~D., van Bruggemann,~E., Gnauk,~T., Herrmann,~H., Xiao,~R., Deng,~Z., Hu,~M., Zhu,~T., and Zhang,~Y.: Performance of an aerodyne aerosol mass spectrometer (AMS) during intensive campaigns in China in the summer of 2006, Aerosol Sci. Technol., 43, 189–204, 2009.

Topping,~D., Coe,~H., McFiggans,~G., Burgess,~R., Allan,~J., Alfarra,~M R., Bower,~K., Choularton,~T W., Decesari,~S., and Facchini,~M C.: Aerosol chemical characteristics from sampling conducted on the Island of Jeju, Korea during ACE Asia, Atmos. Environ., 38(14), 2111–2123, 2004.

Turpin,~B J. and Huntzicker,~J J.: Identification of secondary aerosol episodes and quantification of primary and secondary organic aerosol concentrations during SCAQS, Atmos. Environ., 29, 3527–3544, 1995.

Turpin,~B J. and Lim,~H J.: Species contributions to \chemPM_2.5 mass concentrations: revisiting common assumptions for estimating organic mass, Aerosol Sci. Technol., 35, 602–610, 2001.

Ulbrich,~I M., Lechner,~M., and Jimenez,~J L.: AMS Spectral Database, available at: http://cires.colorado.edu/jimenez-group/AMSsd (last access: January 2011), 2007.

Ulbrich,~I M., Canagaratna,~M R., Zhang,~Q., Worsnop,~D R., and Jimenez,~J L.: Interpretation of organic components from Positive Matrix Factorization of aerosol mass spectrometric data, Atmos. Chem. Phys., 9, 2891–2918, \doi10.5194/acp-9-2891-2009, 2009.

Weimer,~S., Drewnick,~F., and Hogrefe,~O.: Size-selective nonrefractory ambient aerosol measurements during the particulate matter technology assessment and characterization study-New York 2004 winter intensive in New York, J Geophys. Res., 111, D18305, \doi10.1029/2006JD007215, 2006.

Xiao,~R., Takegawa,~N., Kondo,~Y., Miyazaki,~Y., Miyakawa,~T., Hu,~M., Shao,~M., Zeng,~L M., Hofzumahaus,~A., Holland,~F., Lu,~K., Sugimoto,~N., Zhao,~Y., and Zhang,~Y H.: Formation of submicron sulfate and organic aerosols in the outflow from the urban region of the Pearl River Delta in China, Atmos. Environ., 43, 3754–3763, 2009.

Yao,~X., Fang,~M., and Chan,~C K.: Size distributions and formation of dicarboxylic acids in atmospheric particles, Atmos. Environ., 36, 2099–2107, 2002.

Yao,~X., Lau,~A P S., Fang,~M., Chan,~C K., and Hu,~M.: Size distributions and formation of ionic species in atmospheric particulate pollutants in Beijing, China: 1-inorganic ions, Atmos. Environ., 37, 2991–3000, 2003a.

Yao,~X., Lau,~A P S., Fang,~M., Chan,~C K., and Hu,~M.: Size distributions and formation of ionic species in atmospheric particulate pollutants in Beijing, China: 2-dicarboxylic acids, Atmos. Environ., 37, 3001–3007, 2003b.

Yue,~D L., Hu,~M., Wu,~Z J., Guo,~S., Wen,~M T., Nowak,~A., Wehner,~B., Wiedensohler,~A., Takegawa,~N., Kondo,~Y., Wang,~X S., Li,~Y P., Zeng,~L M., and Zhang,~Y H.: Variation of particle number size distributions and chemical compositions at the urban and downwind regional sites in the Pearl River Delta during summertime pollution episodes, Atmos. Chem. Phys., 10, 9431–9439, \doi10.5194/acp-10-9431-2010, 2010.

Zhang,~Q., Stanier,~C O., Canagaratna,~M R., Jayne,~J T., Worsnop,~D R., Pandis,~S N., and Jimenez,~J L.: Insights into the chemistry of new particle formation and growth events in Pittsburgh based on aerosol mass spectrometry, Environ. Sci. Technol., 38(18), 4797–4809, 2004.

Zhang,~Q., Alfarra,~M R., Worsnop,~D R., Allan,~J D., Coe,~H., Canagaratna,~M R., and Jimenez,~J L.: Deconvolution and quantification of hydrocarbon-like and oxygenated organic aerosols based on aerosol mass spectrometry, Environ. Sci. Technol., 39, 4938–4952, 2005a.

Zhang,~Q., Worsnop,~D R., Canagaratna,~M R., and Jimenez,~J L.: Hydrocarbon-like and oxygenated organic aerosols in Pittsburgh: insights into sources and processes of organic aerosols, Atmos. Chem. Phys., 5, 3289–3311, \doi10.5194/acp-5-3289-2005, 2005b.

Zhang,~Q., Canagaratna,~M R., Jayne,~J T., Worsnop,~D R., and Jimenez,~J L.: Time and size-resolved chemical composition of submicron particles in Pittsburgh: implications for aerosol sources and processes, J Geophys. Res., 110, D07S09, \doi10.1029/2004JD004649, 2005c.

Zhang,~Q., Jimenez,~J L., Canagaratna,~M R., Allan,~J D., Coe,~H., Ulbrich,~I., Alfarra,~M R., Takami,~A., Middlebrook,~A M., Sun,~Y L., Dzepina,~K., Dunlea,~E., Docherty,~K., DeCarlo,~P F., Salcedo,~D., Onasch,~T., Jayne,~J T., Miyoshi,~T., Shimono,~A., Hatakeyama,~S., Takegawa,~N., Kondo,~Y., Schneider,~J., Drewnick,~F., Borrmann,~S., Weimer,~S., Demerjian,~K., Williams,~P., Bower,~K., Bahreini,~R., Cottrell,~L., Griffin,~R J., Rautiainen,~J., Sun,~J Y., Zhang,~Y M., and Worsnop,~D R.: Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically-influenced Northern Hemisphere midlatitudes, Geophys. Res. Letters, 34, L13801, \doi10.1029/2007GL029979, 2007.

Zhang,~Y H., Zhu,~X L., Slanina,~S., Shao,~M., Zeng,~L M., Hu,~M., Bergin,~M., and Salmon,~L.: Aerosol pollution in some Chinese cities, Pure Appl. Chem., 76(6), 1227–1239, 2004.

Zhang,~Y H., Hu,~M., Zhong,~L J., Wiedensohler,~A., Liu,~S C., Andreae,~M O., Wang,~W., and Fan,~S J.: Regional integrated experiments on air quality over Pearl River Delta 2004 (PRIDE-PRD2004): overview, Atmos. Environ., 42, 6157–6173, 2008.

Zheng,~M., Kester,~D R., Wang,~F., Shi,~X., and Guo,~Z.: Size distributions of organic and inorganic species in Hong Kong aerosols during the wet and dry seasons, J Geophys. Res., 113, D16303, \doi10.1029/2007JD009494, 2008.

Zheng,~M., Wang,~F., Hagler,~G S W., Hou,~X., Bergin,~M H., Cheng,~Y., Salmon,~L G., Schauer,~J J., Louie,~P K K., Zeng,~L., and Zhang,~Y.: Sources of excess urban carbonaceous aerosol in the Pearl River Delta Region, China, Atmos. Environ., doi:10.1016/j.atmosenv.2010.09.041, in press, 2011.

Zhuang,~H., Chan,~C K., Fang,~M., and Wexler,~A S.: Size distributions of particulate sulfate, nitrate and ammonium at a~coastal site in Hong Kong, Atmos. Environ., 33, 843–853, 1999.