文献类型：期刊文献

英文题名：Impact of boreal summer intraseasonal oscillation on the coastal upwelling off eastern Hainan Island

作者：Xiong, Yuanyuan[1,2];Ling, Zheng[1,2];Zhu, Xueming[1,2];Ma, Chunlei[1,2]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Key Lab Climate Resources & Environm Continental S, Zhanjiang 524088, Peoples R China;[2]Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China

年份：2026

外文期刊名：ACTA OCEANOLOGICA SINICA

收录：SCI-EXPANDED(收录号：WOS:001713961900001)、、WOS

基金：The Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) under contract Nos SML2022SP401 and SML2024SP023; the National Natural Science Foundation of China under contract No. 42176029; the Ocean Negative Carbon Emissions (ONCE) Program.

语种：英文

外文关键词：intraseasonal oscillation; Qiongdong upwelling; South China Sea; BSISO; chlorophyll a

外文摘要：The coastal upwelling off eastern Hainan Island (Qiongdong upwelling, QDU) is a significant seasonal upwelling system in the northwestern South China Sea, playing a crucial role in marine biological resources, the carbon cycle, and ecosystem dynamics. Using satellite observed sea surface temperature (SST) and atmospheric reanalysis datasets, combined with numerical simulation, this study investigates the impact of the boreal summer intraseasonal oscillation (BSISO) on the QDU. Results show that under the influence of BSISO, the QDU exhibits pronounced intraseasonal variation characteristics. The changes in QDU further influences SST and chlorophyll a (Chl-a), with their responses lagging behind upwelling by 2-4 d. The BSISO contains two components, BSISO1 (30-60 d period) and BSISO2 (10-20 d period), both of which can affect the QDU through modulating the wind field, with BSISO2 having a more substantial impact than BSISO1. During enhancing phases, the anomalous southerly winds strengthen the QDU through enhanced offshore Ekman transport and local Ekman pumping. During weakening phases, the anomalous northerly winds weaken the QDU through reduced offshore Ekman transport and local Ekman pumping. In this wind-driven modulation process, Ekman transport is found to play a major role. The combined effects of BSISO1 and BSISO2 are also discussed in this study: when both BSISO1 and BSISO2 are in enhancing phases, the anomalous southwesterly winds intensify the QDU to its strongest; conversely, when both are in weakening phases, the northeasterly winds suppress the QDU to its weakest.