Mathematics – Logic
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3123s09v&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 23, CiteID L23S09
Mathematics
Logic
11
Oceanography: Biological And Chemical: Plankton, Oceanography: Biological And Chemical: Trace Elements, Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling, Information Related To Geographic Region: Atlantic Ocean, Oceanography: Biological And Chemical: Biogeochemical Cycles (1615)
Scientific paper
Nitrogen fixation supports new production in the oligotrophic oceans and removes dinitrogen and carbon dioxide from mixed layer waters. N-fixation rates have been estimated in various ways but measurements are still too rare and factors limiting N-fixation are not yet fully understood. Here we present data from a transect along 10°N through the tropical Atlantic on the Meteor Cruise 55 where N-fixation rates between 3.7 and 255 μmol N*m-2*d-1 were recorded. The highest rates occurred off Africa in the eastern tropical North Atlantic (ETNA), and in the Amazon River plume in the West and contributed to 1-12.2% of the N-demand of primary production. N-fixation rates correlated with dissolved Fe concentrations, which were 20-280 times greater than the estimated demand. High atmospheric Fe inputs combined with the shallow nutricline make the ETNA a favourable environment for N-fixers.
Croot Peter
Lochte Karin
Mills Matthew
Peeken Ilka
Voss Maren
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