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Precipitation chemistry in central AmazoniaRain samples from three sites in central Amazonia were collected over a period of 6 weeks during the 1987 wet season and analyzed for ionic species and dissolved organic carbon. A continuous record of precipitation chemistry and amount was obtained at two of these sites, which were free from local or regional pollution, for a time period of over 1 month. The volume-weighted mean concentrations of most species were found to be about a factor of 5 lower during the wet season compared with previous results from the dry season. Only sodium, potassium, and chloride showed similar concentrations in both seasons. When the seasonal difference in rainfall amount is taken into consideration, the deposition fluxes are only slightly lower for most species during the wet season than during the dry season, again with the exception of chloride, potassium, and sodium. Sodium and chloride are present in the same ratio as in sea salt; rapid advection of air masses of marine origin to the central Amazon Basin during the wet season may be responsible for the observed higher deposition flux of these species. Statistical analysis suggests that sulfate is, to a large extent, of marine (sea salt and biogenic) origin, but that long-range transport of combustion-derived aerosols also makes a significant contribution to sulfate and nitrate levels in Amazonian rain. Organic acid concentrations in rain were responsible for a large fraction of the observed precipitation acidity; their concentration was strongly influenced by gas/liquid interactions.
Document ID
19900065068
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Andreae, M. O.
(Max-Planck-Institut fuer Chemie Mainz, Federal Republic of Germany, United States)
Talbot, R. W.
(NASA Langley Research Center Hampton, VA; New Hampshire, University, Durham, United States)
Berresheim, H.
(Georgia Institute of Technology Atlanta, United States)
Beecher, K. M.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
September 20, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Meteorology And Climatology
Accession Number
90A52123
Funding Number(s)
CONTRACT_GRANT: NAG1-588
Distribution Limits
Public
Copyright
Other

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