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[D-3.1 Study on the Time-Space Variability of the Marine Biogeochemical Parameters Based on the in situ Ferry Monitoring and Satellite Ocean Color Sensing]

[Contact Person]

Akira Harashima
Head, Ocean Research Team
Global Environment Division
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305 Japan
Phone +81-298-50-2508, Fax +81-298-51-4732
E-mail harashim@nies.go.jp

[Total Budget for FY1993-1995]

35,359,000 Yen (FY1995 12,056,000 Yen)

[Abstract]

　From biogeochemical time series obtained from ferry-based monitoring system, three types of seasonal cycles in (DIP, DIN, DSi and phytoplankton species composition) were defined. Type (a) is characterized by the less anthropogenically affected area, where DIN, DIP are depleted and DSi remains after the termination of diatom-based blooms. In Type (b), residual DIN and DIP favors dinoflagellates after the bloom. In Type (c), the remineralization of sedimental organic matters keep the level of nutrients. There is a possibility of ecological changes from type (a) to type (b) or (c) in the Asian marginal seas because of the change of Si and other nutrient loading originated from large scale land-use modifications on the continent.

[Key Words]

Phytoplankton Blooming, Ferry, DSi-Depletion, pH-Hole, Anthropogenic Effects