Intrusions of Kuroshio and Shelf Waters on Northern Slope of South China Sea in Summer 2015  

作　　者：LI Denghui ZHOU Meng ZHANG Zhaoru ZHONG Yisen ZHU Yiwu YANG Chenghao XU Mingquan XU Dongfeng HU Ziyuan 

机构地区：[1]Institute of Oceanology, Shanghai Jiao Tong University, Shanghai 200240, China [2]Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China [3]Second Institute of Oceanography, China State Ocean Administration, Hangzhou 310012, China [4]School for the Environment, University of Massachusetts, Boston 02125, USA

出　　处：《Journal of Ocean University of China》2018年第3期477-486,共10页中国海洋大学学报（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2014CB441500);the National Natural Science Foundation of China (No. 41406021)

摘　　要：The northern slope region of the South China Sea(SCS) is a biological hot spot characterized by high primary productivity and biomasses transported by cross-shelf currents, which support the spawning and growth of commercially and ecologically important fish species. To understand the physical and biogeochemical processes that promote the high primary production of this region, we conducted a cruise from June 10 and July 2, 2015. In this study, we used fuzzy cluster analysis and optimum multiparameter analysis methods to analyze the hydrographic data collected during the cruise to determine the compositions of the upper 55-m water masses on the SCS northern slope and thereby elucidate the cross-slope transport of shelf water(SHW) and the intrusions of Kuroshio water(KW). We also analyzed the geostrophic currents derived from acoustic Doppler current profiler measurements and satellite data. The results reveal the surface waters on the northern slope of the SCS to be primarily composed of waters originating from South China Sea water(SCSW), KW, and SHW. The SCSW dominated a majority of the study region at percentages ranging between 60% and 100%. We found a strong cross-slope current with speeds greater than 50 cms^(-1) to have carried SHW into and through the surveyed slope area, and KW to have intruded onto the slope via mesoscale eddies, thereby dominating the southwestern section of the study area.The northern slope region of the South China Sea （SCS） is a biological hot spot characterized by high primary produc-tivity and biomasses transported by cross-shelf currents, which support the spawning and growth of commercially and ecologically important fish species. To understand the physical and biogeochemical processes that promote the high primary production of this region, we conducted a cruise from June 10 and July 2, 2015. In this study, we used fuzzy cluster analysis and optimum multiparam-eter analysis methods to analyze the hydrographic data collected during the cruise to determine the compositions of the upper 55-m water masses on the SCS northern slope and thereby elucidate the cross-slope transport of shelf water （SHW） and the intrusions of Kuroshio water （KW）. We also analyzed the geostrophic currents derived from acoustic Doppler current profiler measurements and satellite data. The results reveal the surface waters on the northern slope of the SCS to be primarily composed of waters originating from South China Sea water （SCSW）, KW, and SHW. The SCSW dominated a majority of the study region at percentages ranging between 60% and 100%. We found a strong cross-slope current with speeds greater than 50 cm s？1 to have carried SHW into and through the surveyed slope area, and KW to have intruded onto the slope via mesoscale eddies, thereby dominating the southwestern section of the study area.

关 键 词：South China Sea shelf water Kuroshio water geostrophic currents cross-slope current 

分 类 号：P731.2[天文地球—海洋科学]