Mathematics – Logic
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106301c&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 6, CiteID L06301
Mathematics
Logic
4
Oceanography: General: Remote Sensing And Electromagnetic Processes (0689), Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Oceanography: Biological And Chemical: Modeling, Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling
Scientific paper
Climatological satellite observations in the tropical North Atlantic generally show a wintertime surface chlorophyll-a (Chl-a) maximum except over a broad region in the western North Atlantic that has a summer Chl-a maximum. This region also shows decoupling between Chl-a and vertical nutrient flux, based on the positive relationship between sea surface height anomaly (SSH), sea surface temperature, and Chl-a. An analogous summer Chl-a maximum is simulated in a model including a dynamic representation of Trichodesmium and N2-fixation, but not in runs without. These results suggest that the growth is fuelled by N2-fixation. Using the observed summertime increase in Chl-a and the model efficiency for N2-fixation transfer to phytoplankton biomass, we calculate a nitrogen fixation rate of 220 μmol N m-2day-1 in this region. This constitutes the first satellite observation of the effect of nitrogen fixation on Chl-a, and may ultimately provide a means of deriving new global N2-fixation estimates.
Coles Victoria J.
Hood Raleigh R.
Wilson Christine
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