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Chemical characterization of ambient aerosol collected during the northeast monsoon season over the Arabian Sea: Anions and cations

Johansen, Anne M. and Hoffmann, Michael R. (2004) Chemical characterization of ambient aerosol collected during the northeast monsoon season over the Arabian Sea: Anions and cations. Journal of Geophysical Research D, 109 (D5). Art. No. D05305. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20150806-141030588

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Abstract

Ambient aerosol samples were collected over the Arabian Sea during the month of March 1997, aboard the German R/V Sonne, as part of the German JGOFS project (Joint Global Ocean Flux Study). This is the third study in a series of analogous measurements taken over the Arabian Sea during different seasons of the monsoon. Dichotomous high volume collector samples were analyzed for anions and cations upon return to the laboratory. Anthropogenic pollutant concentrations were larger during the first part of the cruise, when air masses originated over the Indian subcontinent. Total NSS-SO_4^(2−) concentrations amounted to 2.94 ± 1.06 μg m^(−3) of which 92.1 ± 4.5% was present in the fine fraction. NSS-SO_4^(2−) source apportionment analysis with multivariate linear regression models revealed that in the coarse fraction half is biogenically and half anthropogenically derived, while in the fine fraction only 6% seemed of biogenic origin and 84% anthropogenic and 10% crustal in nature. Chloride deficits up to 99.1% in the fine fraction were observed. The average Cl^− deficit in the fine fraction was 89.0 ± 9.4%, potentially related to NSS-SO_4^(2−) acid displacement and Cl reactive species formation, while in the coarse fraction it was 25.6 ± 21.3%, with NO_3^− being the preferred species for acid displacement.


Item Type:Article
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http://dx.doi.org/10.1029/2003JD004111DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2003JD004111/abstractPublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2004 American Geophysical Union. Received 26 August 2003; revised 8 December 2003; accepted 31 December 2003; published 4 March 2004. This work is abstracted in part from the Ph.D. thesis of A. M. Johansen, California Institute of Technology. The authors wish to thank Drs. Meinrat O. Andreae and Hermann W. Bange (latter, now at Center for Marine Science, Kiel, Germany) from the Max Planck Institute of Biogeochemistry in Mainz, Germany, for assistance with the cruise, which was sponsored by the German Joint Global Ocean Flux Study (JGOFS) project. Appreciation is also extended to the helpful crew of the R/V Sonne. Research support was provided by the National Science Foundation and by the Environmental Now Foundation. Their support is greatly appreciated.
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NSFUNSPECIFIED
Environmental Now FoundationUNSPECIFIED
Issue or Number:D5
Record Number:CaltechAUTHORS:20150806-141030588
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150806-141030588
Official Citation:Johansen, A. M., and M. R. Hoffmann (2004), Chemical characterization of ambient aerosol collected during the northeast monsoon season over the Arabian Sea: Anions and cations, J. Geophys. Res., 109, D05305, doi:10.1029/2003JD004111.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59268
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Aug 2015 23:30
Last Modified:03 Mar 2020 13:01

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