Production of dissolved organic carbon in the South China Sea:A modeling study

查看全文 作　　者：Wentao [1,2]MA;Peng [3,4]XIU;Yi [1,2]YU;Yiling [1]ZHENG;Fei [1,5]CHAI

机构地区：[1]State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;[2]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519080,China;[3]Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;[4]State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;[5]School of Marine Sciences,University of Maine,Orono 04469,Maine,USA

出　　处：《Science China Earth Sciences》索引2022年第65卷第2期,共14页

基　　金：This work was supported by the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(Grant No.SML2020SP008);the National Key Research and Development Program of China(Grant No.2016YFA0601101);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB42000000);the National Natural Science Foundation of China(Grant Nos.41876123,41890805,41876032);SOED research program(Grant No.SOEDZZ2104);State Key Laboratory of Marine Geology,Tongji University(Grant No.MGK202103);the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(Grant No.GML2019ZD0305). 摘　　要：The South China Sea(SCS)is the largest semi-enclosed marginal sea in the western Pacific.The alternation of East Asian monsoon causes a significant seasonal pattern of chlorophyll,primary productivity,and export flux of sinking particles.However,the source and sink of dissolved organic carbon(DOC)pools with different bioavailability are less studied.Here we evaluated the seasonal production of DOC in labile,semi-labile and refractory forms using a coupled physical-biogeochemical model.This study aims to understand the dynamics and budgets of organic matters in the SCS.Model results show that the production of labile,semi-labile and refractory DOC is highly correlated with the net primary productivity(NPP)which is higher in winter and lower in summer,reflecting a dependence of DOC on the NPP.The seasonal variation in Pearl River discharge dominates the DOC production in the northern coastal region.In the northeast,the Kuroshio intrusion associated frontal system is attributed to cause high winter production.The DOC production in the southwest is controlled by both winter mixing and summer upwelling.The production of refractory DOC with the least bioavailability favors carbon sequestration.Its annual mean production is 1.8±0.5 mg C m^(−2) d^(−1),equivalent to 26%of the export flux of particulate organic carbon at 1000 m. 关键词：Dissolved organic carbon Microbial carbon pump South China Sea Biogeochemical model ROMS COSINE

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Production of dissolved organic carbon in the South China Sea:A modeling study

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