|Budget Amount *help
¥96,100,000 (Direct Cost: ¥96,100,000)
Fiscal Year 2010: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2009: ¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2008: ¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 2007: ¥13,700,000 (Direct Cost: ¥13,700,000)
Fiscal Year 2006: ¥59,400,000 (Direct Cost: ¥59,400,000)
In the surface waters of the western North Pacific Ocean, we investigated biogeochemical processes of trace metals, which supplied through the deposition of atmospheric aerosols such as Asian dust, and its bioavailability for phytoplankton growth. Atmospheric aerosols influenced by anthropogenic sources during the transport from the Asian continent to the North Pacific showed relatively high trace-metal solubility, and growth of phytoplankton was stimulated along with the increases in dissolved iron concentrations. Volcanic ash depositions were found to initiate phytoplankton blooms in the subarctic North Pacific during summer and it could be one of the important sources of trace metals from the atmosphere to the surface-ocean.