Mathematics – Logic
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30uasc2m&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 21, pp. ASC 2-1, CiteID 2085, DOI 10.1029/2003GL018035
Mathematics
Logic
40
Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Atmospheric Composition And Structure: Geochemical Cycles, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Oceanography: Biological And Chemical: Aerosols (0305), Oceanography: Biological And Chemical: Trace Elements
Scientific paper
For Fe contained in long-range transported aeolian dust to act as a micronutrient for oceanic phytoplankton it must be first dissolved or mobilized. We propose that Fe-mobilization can occur in mineral dust from East Asia by the incorporation of SO2 into the advecting dust plumes and subsequent acidification of the dust through heterogeneous SO2 oxidation. To test this hypothesis, we consider a dust plume that originated from the gobi-deserts and advected over the Pacific Ocean. Data collected over the Yellow Sea confirm that this plume contained high concentrations of dust and SO2. Significant gaseous HNO3 concentrations indicate that the dust particles were acidified (i.e., pH < 2). At these pH's, 1-2% of the Fe contained in a deliquescent mineral dust particle would be mobilized within 3-5 days. These results suggest a possible link between the rate of C-fixation in so-called High-Nitrate-Low-Chlorophyll regions of the Pacific Ocean and SO2 emissions from East Asia.
Chameides W. L.
Chen Gang
Meskhidze N.
Nenes Athanasios
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