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The distribution of lead between sea salt dust, and lead-rich aerosols in the mid South Pacific easterlies at American Samoa

Rosman, Kevin J. R. and Patterson, Clair C. and Settle, Dorothy M. (1990) The distribution of lead between sea salt dust, and lead-rich aerosols in the mid South Pacific easterlies at American Samoa. Journal of Geophysical Research D, 95 (D4). pp. 3687-3691. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20140702-152811027

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Abstract

Aerosols in the South Pacific Easterlies have been sampled at American Samoa with a cascade impactor and analysed for Pb, Ba, K, Ca, Sr, and Rb by isotope dilution mass spectrometry using ultraclean procedures. Some 84% of the Pb was found in fine (≤ 0.5 μm) aerosols which were collected on the backup filter with an efficiency of only 33%. Sea salt and eroded terrestrial material (dust) containing 6% and <1% respectively, of the Pb (sea salt indexed by the metals K, Ca, Sr, and Rb and dust indexed by Ba) were collected on early stages of the impactor, although 65% of the dust, because of its larger size, was lost to surfaces of the rain shelter before reaching the impactor. The remaining 10% of the Pb was associated with plant leaf waxes of continental origin which produced Pb and Ba peaks on stage 4 (0.5 μ) of the impactor.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/JD095iD04p03687DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/JD095iD04p03687/abstractPublisherArticle
Additional Information:© 1990 American Geophysical Union. (Received August 2, 1988; revised November 3, 1989; accepted November 7, 1989.) We thank our colleagues at the Graduate School of Oceanography at the University of Rhode Island for providing the impactor collection device and associated pumping equipment. This experiment was made possible by the cooperative effort of members of the interuniversity NSF SEAREX program, and their contributions made this experiment possible. We also thank members of the NOAA GMCC observatory at the American Samoa site for their generous assistance in field operations. This research was supported by NSF grants OCE 77-14520 and OCE 81-11893, A02. Division of Geological and Planetary Sciences, California Institute of Technology, contribution 4601.
Funders:
Funding AgencyGrant Number
NSF SEAREXUNSPECIFIED
NSFOCE 77-14520
NSFOCE 81-1189, A02
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences4601
Issue or Number:D4
Record Number:CaltechAUTHORS:20140702-152811027
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140702-152811027
Official Citation:Rosman, K. J. R., C. C. Patterson, and D. M. Settle (1990), The distribution of lead between sea salt dust, and lead-rich aerosols in the mid South Pacific easterlies at American Samoa, J. Geophys. Res., 95(D4), 3687–3691, doi:10.1029/JD095iD04p03687.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46647
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:03 Jul 2014 16:20
Last Modified:03 Oct 2019 06:46

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