FY2004 Research Products
Variability of primary productivity in the Bering Sea: Marine ecosystem response to climate change using SeaWiFS, AVHRR and TOPEX/POSIEDON data
- PI: Dr.Sei-ichi Saitoh
- Project title: Variability of Primary Productivity in the Sub-Arctic Seas and Arctic Ocean using ADEOS-II GLI - Response of Marine Ecosystem to Climate Changes
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| Figure 2. Time-latitude plot of chlorophyll-a concentration (a) and Primary production (b) along the shelf edge from 1998 to 2000 (copyright, S. Saitoh). | |
TOPEX/Poseidon sea surface height anomaly (SSHA), SeaWiFS L3 chlorophyll-a concentration and primary production were examined for an interaction of eddy field and phytoplankton distribution along the shelf edge in the southeastern Bering Sea. Primary production was calculated using SeaWiFS chl-a, photosynthetic available radiation (PAR) and NOAA Advanced Very High Resolution Radiometer (AVHRR) sea surface temperature using the Kameda and Ishizaka model (2002). A time-latitude plot of SeaWiFS chl-a exhibited that relatively high chi-a concentration (over 1.0 mg m3) continuously exited along the shelf edge for 2 to 3 months in the summer of 1999 when several eddies including long-lived ones were observed. It also existed for about 6 months in 200 when there was the eddy-rich environment. The same pattern of chi-a concentration was obtained in a time -latitude plot of primary production. The numerical modeling of tracer tracking and eddy formation along the shelf edge in the southeastern Bering Sea was compared.
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| Figure 3. Result of numerical, modeling of (a) tracer distribution and (b) surface elevation after 40 days along the continental shelf edge in the southeastern Bering Sea (copyright, S. Saitoh). | |
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