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POC fluxes from euphotic zone estimated from ^(234)Th deficiency in winter in the northwestern North Pacific Ocean

Acta Oceanologica Sinica 2004年第1期23卷 135-147页

作者： YANGYongliang HANXu kusakabemasashi GruangzhouInstituteofGeochemistry ChineseAcademyofSciencesGuangzhou510640China DepartmentofEnvironmentalScience QingdaoUniversityQingdao266071China NakaminatoLaboratory NationalInstituteofRadiologicalSciences3609IsozakichoHitachinaka311-1202Japan

Dissolved and particulate 234 Th, particulate organic carbon(PON), nitrogen, and chlorophyll-a concentrations in the upper 200 m of water columns from seven stations in the northwestern North Pacific Ocean were determined in the winter of *** dissolved, particulate, and total 234 Th activities (dissolved plus particulate)show a pronounced deficiency with respect to its parent 238 U in the euphotic zone whereas the total 234 Th shows a near-equilibrium at the depth greater than 100 *** 234 Th data are used to derive the mean residence time, export fluxes of 234 Th, and fluxes of particulate organic carbon and nitrogen out of the euphotic zone. In the Subarctic Current area, the residence time of dissolved 234 Th with respect to its removal onto particles is 40 ~50 d while the residence time of dissolved 234Th in the subtropical area is about 20 d due to the Kuroshio's *** particulate organic carbon(POC)and particulate organic nitroge(PON)fluxes in winter range over 3.8～8.2 and 0.50～0.98 mmol/(m2 ·d), respectively, and are higher in the west region than in the east, and higher in the south than in the north. The co-influence of Kuroshio-Oyashio Currents with supply of nutrient substances from the coastal area and the light condition are two factors determining the horizontal distribution of POC fluxes in *** depth distribution of the chlorophyll-a as well as the consistence of the ratio of POC to PON with the Redfield ratio suggest that phytoplankton is the main contributor to the export of POC in this area in *** POC fluxes in the northwestern North Pacific Ocean in winter are comparable to some areas in the world oceans in spring and summer seasons.

关键词： Th POC PON export production northwestern North Pacific Oceam

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