Bering Sea shows the highest concentration of crustal elements in the SPM of surface seawaters and of chlorophyll-a among investigated marginal seas because of large supply of land materials. Bering Sea is the high primary productive marginal sea caused by the supply of nutrients from land through riverine and atmospheric transport.
Indication for plankton fall bloom in Bering Sea found from in situ data of particulate Ca, Si and chlorophyll-a and Chlorophyll-a distribution obtained by the satellite images. Where in station 31 and 32 found the highest concentrations of Ca, Si and chlorophyll-a. High chlorophyll-a is corresponded to high particulate Ca and Si in SPM produced by debris from shell test of diatom and/or coccolithopores.
Ratio of biogenic Ca to Chl-a was found approximately 20-60 times larger than ratio of biogenic Si to Chl-a. Diatoms are expected to produce Chl-a 20-60 times more efficient than that of coccolithopores in general.
Nutrients as NO3 and trace metal Fe as limiting factors for primary productivity, found in clear relationship with chlorophyll-a. In presence of Fe, even in low concentration with NO3 concentrations up to 1 g l-1, concentration of Chl-a was found to be up to 1 g l-1.
Indication for plankton fall bloom in Bering Sea found from in situ data of particulate Ca, Si and chlorophyll-a and Chlorophyll-a distribution obtained by the satellite images. Where in station 31 and 32 found the highest concentrations of Ca, Si and chlorophyll-a. High chlorophyll-a is corresponded to high particulate Ca and Si in SPM produced by debris from shell test of diatom and/or coccolithopores.
Ratio of biogenic Ca to Chl-a was found approximately 20-60 times larger than ratio of biogenic Si to Chl-a. Diatoms are expected to produce Chl-a 20-60 times more efficient than that of coccolithopores in general.
Nutrients as NO3 and trace metal Fe as limiting factors for primary productivity, found in clear relationship with chlorophyll-a. In presence of Fe, even in low concentration with NO3 concentrations up to 1 g l-1, concentration of Chl-a was found to be up to 1 g l-1.