Biogeochemical impact of tropical instability waves in the equatorial Pacific

Details Biogeochemical impact of tropical instability waves in the equatorial Pacific Biogeochemical impact of tropical instability waves in the equatorial Pacific

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224615g&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 24, CiteID L24615

Mathematics

Logic

8

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Oceanography: General: Equatorial Oceanography, Oceanography: Physical: Eddies And Mesoscale Processes

Scientific paper

Tropical Instability Waves (TIW) have been suggested to fertilize the equatorial Pacific in iron leading to enhanced ecosystem productivity. Using a coupled dynamical-biogeochemical model, we show that contrary to this suggestion, TIWs induce a decrease of iron concentration by 10% at the equator and by about 3% over the Wyrtki box [90°W-180, 5°N-5°S]. Chlorophyll decreases by 10% at the equator and 1% over the Wyrtki box. This leads to a decrease of new production up to 10% at the equator (4% over the Wyrtki box). TIW-induced horizontal advection exports iron-rich equatorial water to the north, but also brings iron-depleted water to the equator leading to a net decrease in iron. Additional iron decrease is caused by TIW-induced iron vertical diffusion. These two mechanisms are partly counter balanced by a decrease of iron biological uptake, driven by lower phytoplankton concentrations, and to a lesser extent by TIW-induced iron vertical advection.

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