Dunne, J. P. University of Washington, Oceanography, jdunne@ocean.washington.edu
Murray, J. P. University of Washington, Oceanography, jmurray@ocean.washington.edu
Rodier, M. ORSTOM, Centre d'Ocianologie de Marseille, rodier@com.univ-mrs.fr

 
THE ROLE OF MESOSCALE WAVES ON NEW AND EXPORT PRODUCTION IN THE EQUATORIAL PACIFIC UPWELLING ZONE
 
We measured particulate organic carbon export fluxes using 234Th and sediment traps along the equator during two cruises: the French JGOFS FLUPAC study in October, 1994 and the Zonal Flux study in April, 1996 both along the equator from 165E to 150W. These cruises took place under extremely different conditions: the FLUPAC cruise during a strong El Nino and the Zonal Flux during a mild La Nina. We compare our results with new production and dissolved organic carbon accumulation estimates from these cruises and results from the US JGOFS EqPac cruises. We suggest that, after the simple presence or absence of surface nutrients, the major forcings of new and export production near the equator are enhancement by tropical instability waves and diminishment by Kelvin waves. While the geographical extent of surface nutrients and associated enhanced production is a strong function of season and El Nino, we suggest that equatorial waves, rather than the steady state upwelling velocity, are the dominant sources of variability within the equatorial upwelling zone itself.
 
Day: Thursday, Feb. 4
Time: 09:30 - 09:45am
Location: Sweeney Center
 
Code: SS39TH0930S