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The central and western equatorial Pacific is characterized by the Western Pacific Warm Pool (WPWP). The behavior of the WPWP has a significant influence on global climate changes such as El Nino and ...Southern Oscillation and it drastically modifies the oceanographic conditions in the area every few years. It is important to evaluate time-series diatom fluxes during El Nino and La Nina events. As a part of the Global Carbon Cycle and Related Mapping based on Satellite Imagery Program (GCMAPS), time-series sediment traps were deployed at two water depths, approximately 1,000 m and 3,000 m, in the central and western equatorial Pacific for two years between January 1999 through December 2000. Sites MTI-3 were located in the WPWP and sites MT5 and 6 were in the Equatorial Upwelling Region (EUR). Total diatom fluxes showed seasonal patterns at all sites. The diatom species compositions in the flux assemblages were different between the WPWP and EUR. Pennate diatoms (e.g. Nitzschia bicapitata, Thalassionema nitzschioides) dominated the diatom assemblages in the WPWP. However, in the EUR, relative abundances of centric diatoms (e.g. Rhizosolenia bergonii, Azpeitia spp., Thalassiosira spp.) were higher than those of pennate diatoms. Thus, the seasonal changes of diatom fluxes and the taxonomic composition are considered to be excellent environmental proxies responding to the conditions of the water masses of the WPWP and the EUR.続きを見る
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