북서태평양에서 입자플럭스의 계절 및 연변화

Abstract

A moored time-series sediment trap was deployed at station FM 1 (13o31’N 136 o 03’E) of the northwestern Pacific from October 2007 to May 2011. Total mass fluxes varied from 2.35 to 31.1 mg m-2 day-1, showing a distinct seasonal variation with high fluxes in winter and low in summer. During the El Nino period, however, total mass fluxes were significantly reduced in winter, indicating that particle fluxes in the northwestern Pacific were considerably influenced by the El Nino. The lower total mass fluxes during the El Nino may be due to the reduced precipitation, which constrained nutrient supply at the surface waters. In addition, wind speed was fairly reduced during this period. CaCO3 fluxes varied from 1.47 to 23.4 mg m-2 day-1, comprising 65.7% of total mass fluxes. CaCO3 fluxes displayed similar annual and seasonal variations with total mass fluxes. Organic carbon fluxes ranged from 0.13 to 4.61 mg m-2 day-1, comprising about 9.7% of total mass fluxes. Organic carbon fluxes showed a large annual variation with higher fluxes in 2008 and lower fluxes in 2010. Biogenic silica fluxes ranged from 0.04 to 2.07 mg m-2 day-1, comprising about 5.3% of total mass fluxes. Biogenic silica fluxes also showed a large annual variation with higher fluxes in 2008 and lower fluxes in 2010. The reason for the large annual variations of organic carbon and biogenic silica fluxes has not been solved yet. with high fluxes in winter and low in summer. During the El Nino period, however, total mass fluxes were significantly reduced in winter, indicating that particle fluxes in the northwestern Pacific were considerably influenced by the El Nino. The lower total mass fluxes during the El Nino may be due to the reduced precipitation, which constrained nutrient supply at the surface waters. In addition, wind speed was fairly reduced during this period. CaCO3 fluxes varied from 1.47 to 23.4 mg m-2 day-1, comprising 65.7% of total mass fluxes. CaCO3 fluxes displayed similar annual and seasonal variations with total mass fluxes. Organic carbon fluxes ranged from 0.13 to 4.61 mg m-2 day-1, comprising about 9.7% of total mass fluxes. Organic carbon fluxes showed a large annual variation with higher fluxes in 2008 and lower fluxes in 2010. Biogenic silica fluxes ranged from 0.04 to 2.07 mg m-2 day-1, comprising about 5.3% of total mass fluxes. Biogenic silica fluxes also showed a large annual variation with higher fluxes in 2008 and lower fluxes in 2010. The reason for the large annual variations of organic carbon and biogenic silica fluxes has not been solved yet.