| POC fluxes from euphotic zone estimated from 234Th deficiency in winter in the northwestern North Pacific Ocean |
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| 作者姓名： | YANG Yongliang HAN Xu KUSAKABE Masashi |
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| 作者单位： | Nakaminato Laboratory，National Institute of Radiological Sciences，3609 Isozakicho，Hitachinaka 311-1202，Japan |
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| 基金项目： | the captain and crew members of the RV Mirai for their sea board assistance，国家自然科学基金 |
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| 摘 要： | 1IntroductionThefluxesofcarbon,nutrients,andassoci-atedelementsinvolvedinthebiogeochemicalcyclesoutoftheeuphoticzoneareimportantinthestudyofglobalCO2 change.Someworkershaveproposedthatatthesteadystatethefluxofparticulateorganiccarbonoutoftheeuphoticzoneequalsthenewproduction(EppleyandPe-terson,1979;Eppley,1989).Generallytwometh-odscanbeemployedtoobtainthefluxdata.Oneistousesedimenttrapsintheupperocean(<200m)orfloatingsedimenttraps.Thoughthesedimenttraptechnologyhasshowntobeuse-fulfortimeser…
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| 关 键 词： | 北太平洋 有机碳 溶解 氮 叶绿素 水柱 |
| 收稿时间： | 2003/10/22 0:00:00 |
| 修稿时间： | 2/8/2004 12:00:00 AM |
POC fluxes from euphotic zone estimated from 234Th deficiency in winter in the northwestern North Pacific Ocean |
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| YANG Yongliang,HAN Xu,KUSAKABE Masashi.POC fluxes from euphotic zone estimated from 234Th deficiency in winter in the northwestern North Pacific Ocean[J].Acta Oceanologica Sinica,2004,23(1):135-148. |
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| Authors: | YANG Yongliang HAN Xu and KUSAKABE Masashi |
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| Institution: | 1.Gruangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Department of Environmental Science, Qingdao University, Qingdao 266071, China2.Department of Environmental Science, Qingdao University, Qingdao 266071, China3.Nakaminato Laboratory, National Institute of Radiological Sciences, 3609 Isozakicho, Hitachinaka 311-1202, Japan |
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| Abstract: | Dissolved and particulate 234Th, 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 1997.The dissolved, particulate, and total 234Th activities (dissolved plus particulate)show a pronounced deficiency with respect to its parent 238U in the euphoric zone whereas the total 234Th shows a near-equilibrium at the depth greaterthan 100 m. The 234Th data are used to derive the mean residence time, export fluxes of 234Th, and fluxes of particulate organic carbon and nitrogen out of the euphotic zone. In the Subarctic Current area, the residence time of dissolved 234 Thwith 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 influence.The particulate organic carbon (POC)and particulate organic nitrogegion than in the east, and higher in the south than in the north. The co-influence of Kuroshio-Oyashio Currents withsupply of nutrient substances from the coastal area and the light condition are two factors determining the horizontaldistribution of POC fluxes in winter. The depth distribution of the chlorophyll-a as well as the consistence of the ratio ofPOC to PON with the Redfield ratio suggest that phytoplankton is the main contributor to the export of POC in this areain winter. The POC fluxes in the northwestern North Pacific Ocean in winter are comparable to some areas in the worldoceans in spring and summer seasons. |
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| Keywords: | Th POC PON export production northwestern North Pacific Oceam |
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