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Atmospheric deposition of nutrients to the Atlantic Ocean
Author(s) -
Baker A. R.,
Kelly S. D.,
Biswas K. F.,
Witt M.,
Jickells T. D.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl018518
Subject(s) - biogeochemical cycle , phytoplankton , nutrient , environmental science , iron fertilization , aerosol , deposition (geology) , new production , oceanography , redfield ratio , chemical oceanography , nitrogen , reactive nitrogen , environmental chemistry , atmospheric sciences , ecology , chemistry , geology , biology , sediment , paleontology , microorganism , organic chemistry , microbial biodegradation , bacteria
The role of atmospheric deposition of iron, nitrogen and phosphorus in supplying nutrients to marine systems has been described, individually, in previous works. Here we examine atmospheric dry deposition of all these nutrients simultaneously, using samples collected during two meridional transects of the Atlantic Ocean. We find that, in line with previous work, desert dust supplies excess iron to the water column. However, primary production promoted by aerosol nitrogen can be sufficient to consume all of the soluble aerosol iron input in some situations. Aerosol N:P is universally very high, so that aerosol is always deficient in P relative to phytoplankton requirements. Nitrogen fixation stimulated by any excess atmospheric iron supply and phytoplankton utilisation of atmospheric nutrient inputs will therefore tend to drive the ecosystem towards P limitation. This emphasises the need to study the biogeochemical impact of atmospheric nutrient deposition in an integrated manner.