文献类型：期刊文献

英文题名：Long-term variation of mesopelagic biogenic flux in the central South China Sea: Impact of monsoonal seasonality and mesoscale eddy

作者：Li, Hongliang[1,2];Wiesner, Martin G.[3];Chen, Jianfang[2,4];Ling, Zheng[5];Zhang, Jingjing[2];Ran, Lihua[2]

机构：[1]Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China;[2]State Ocean Adm, Lab Marine Ecosyst & Biogeochem, Hangzhou 310012, Zhejiang, Peoples R China;[3]Univ Hamburg, Inst Geol, D-20146 Hamburg, Germany;[4]State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Zhejiang, Peoples R China;[5]Guangdong Ocean Univ, Coll Ocean & Meteorol, Guangdong Key Lab Coastal Ocean Variabil & Disast, Zhanjiang 524088, Peoples R China

年份：2017

卷号：126

起止页码：62

外文期刊名：DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS

收录：SCI-EXPANDED(收录号：WOS:000408076600006)、、EI(收录号：20172403755548)、Scopus(收录号：2-s2.0-85020299036)、WOS

基金：This study was financially supported by the State Key R & D Project of China (2016YFA0601100) and the National Natural Science Foundation of China (91128212 and 91528304), the Special Fund for Basic Scientific Research of the Second Institute of Oceanography, State Oceanic Administration (JT1501, JG1514 and JT1401), the National Programme on Global Change and Air -Sea Interaction (GASI-03-01-03-03) and the German Ministry of Education and Research (03G0095, 03G0114, 03G0513, 03G0532, 03F0604, 03F0727 and 03F0673). This paper is a contribution to the Sino-German cooperation project "Impact of the ENSO-Monsoon System on the Biogeochemical Fluxes in the Northern South China Sea". We would like to thank Jiliang Xuan, Ruibin Ding, Denglingtong Lu and Ronghua Chen help with the ancillary data collection and the crew of R/V Xianyanghong-5, R/V Xianyanghong-14 and R/V Sonne for their assistance in the deployment and recovery of the sediment trap moorings. We also wish to express our thanks to Kuanbo Zhou, Jie Xu and Ruiz-Pino Diana for their comments and suggestions.

语种：英文

外文关键词：Sinking biogenic flux; Seasonal variation; Mesoscale eddy; Biological pump; South China Sea

外文摘要：The East Asian Monsoon and mesoscale eddies are known to regulate primary production in South China Sea (SCS), the largest tropical marginal sea; however, their contributions to the deep biogenic flux are yet to be quantified. Based on 7-year time series sediment trap observations at the depth of 1200 m in the central SCS, we used the monthly average sinking biogenic fluxes to evaluate the impact of the monsoon and mesoscale cyclonic eddies on biogenic fluxes in combination with remote sensing physical parameters. The monthly average particulate organic carbon (POC) and opal fluxes, ranging from 3.0 to 5.2 and 14.8-34.9 mg M-2 d(-1), respectively, were higher during the northeastern monsoon period. This corresponded to the deeper mixed layer depth and higher net primary production in this area, due to nutrient replenishment from the subsurface induced by monsoon transition and surface cooling. In contrast, lower POC and opal fluxes occurred during well-stratified inter-monsoon periods. In addition, CaCO3 flux (23.6-37.0 mg m(-2) d(-1)) exhibited less seasonality and was assumed to originate from foraminifera. In terms of the long-term record, the combined effect of cyclonic eddies and mixing in the upper ocean could effectively regulate the temporal variation in the biogenic flux. In particular, the opal and POC fluxes in cyclonic eddies were 116% and 41% higher on average, respectively, than those during the non-cyclonic eddy period. Since the cyclonic eddies mainly occurred during the northeastern monsoon period, their contributions to biogenic flux via diatom blooms might overlap the regular winter flux peak, which could make the biological carbon pump more efficient at CO2 sequestration during this period thus amplifying the impact of seasonal transition.