文献类型：期刊文献

英文题名：Using Stable Isotopes (δ¹⁸O and δD) to Study the Dynamics of Upwelling and Other Oceanic Processes in Northwestern South China Sea

作者：Zhou, Fengxia[1,2,3];Wu, Junhui[1,2,3];Chen, Fajin[1,2,3];Chen, Chunqing[1,2,3];Zhu, Qingmei[1,2,3];Lao, Qibin[1,2,3];Zhou, Xin[1,2,3];Lu, Xuan[1,2,3]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang, Peoples R China;[2]Guangdong Ocean Univ, Key Lab Climate, Resources & Environm Continental Shelf Sea & Deep, Zhanjiang, Peoples R China;[3]Guangdong Ocean Univ, Lab Coastal Ocean Variat & Disaster Predict, Coll Ocean & Meteorol, Zhanjiang, Peoples R China

年份：2022

卷号：127

期号：1

外文期刊名：JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS

收录：SCI-EXPANDED(收录号：WOS:000751885800001)、、WOS

基金：This work was supported by the National Natural Science Foundation of China (U1901213), Guangdong Natural Science Foundation of China (2019B1515120066, 2016A030312004), Foundation for Young Talents in General Colleges and Universities of Guangdong Province (2019KQNCX044), and Project of Enhancing School with Innovation of Guangdong Ocean University (GDOU2016050260).

语种：英文

外文关键词：stable isotopes; upwelling; water mass; physical process; northwestern South China Sea

外文摘要：Few systematic investigations use isotopic compositions (delta O-18 and delta D) of seawater together with water temperature and salinity to trace the water dynamic processes in the upwelling area. This study presents depth-specific delta O-18, delta D, salinity (S), and temperature data of water samples collected from the northwestern South China Sea (NWSCS) during spring and summer 2018 to study upwelling and other oceanic physical processes. Strong upwelling is observed in the southwestern area of the NWSCS in both spring and summer based on the distribution of water temperature. In spring, the area with lower water temperature has generally higher delta D and delta O-18 values than other studied areas, while this phenomenon is not observed in summer. This indicates different hydrodynamic conditions in these seasons. The eastward advection of upwelled water in summer contributes to this phenomenon, which can be supported by the delta O-18-S relationships. delta O-18-S regression line in summer has higher slope than that in spring. Five water masses are defined in both seasons. In the west area of the NWSCS, the offshore upper water (OUW) is mainly formed by the mixing of coastal water and offshore deep water (ODW). We use the principle of mass conservation to estimate the relative contributions of ODW based on delta O-18. ODW in spring contributes 40% to OUW, while in summer it contributes 69%. This study presents the method of using stable isotopes to study the upwelling event in NWSCS and quantifies the contribution of upwelling which obtains more information compared with the traditional hydrological observations.