文献类型：期刊文献

英文题名：The impact of marine heatwaves on surface phytoplankton chlorophyll-a in the South China Sea

作者：Chen, Yingjun[1];Shen, Chunyan[2];Zhao, Hui[1,3,4,5];Pan, Gang[1,4,6]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Coll Fisheries, Zhanjiang 524088, Peoples R China;[3]Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China;[4]Guangdong Ocean Univ, Cooperat Res Ctr Nearshore Marine Environm Change, Zhanjiang 524088, Peoples R China;[5]Guangdong Ocean Univ, Res Ctr Coastal Environm Protect & Ecol Resilience, Zhanjiang 524088, Peoples R China;[6]York St John Univ, Sch Humanities, York, England

年份：2024

卷号：949

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:001288767300001)、、EI(收录号：20243216811280)、Scopus(收录号：2-s2.0-85200231538)、WOS

基金：This work was supported by the National Natural Science Foundation of China (No. 42076162) , the project was supported by the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (No. 311020004) , and the Postgraduate Education Innovation Project of Guangdong Ocean University (202435) .

语种：英文

外文关键词：Chlorophyll-a; Marine heatwaves; Nutrients; Upwelling; South China Sea

外文摘要：According to previous studies, marine heatwaves (MHWs) significantly suppress the phytoplankton chlorophyll-a concentration (Chl a) in tropical oceans. However, pre-MHW Chl a has rarely been considered as a reference value. In this study, the Chl a for the periods preceding and during MHWs events was used to explore the impact of MHWs on Chl a from 1998 to 2022 in the South China Sea (SCS). The Chl a response to MHWs in different regions was further discussed based on the Chl a variation characteristics. The results showed that the Chl a response to MHWs exhibited regional variability. Interestingly, there was a large proportion of positive Chl a anomalies (similar to 0.55) in the estuary and offshore regions during MHWs; however, Chl a anomalies were mostly negative in the upwelling regions. These different response patterns are related to background conditions, including nutrient concentrations, wind-driven dynamics, and light availability. In upwelling regions, negative Chl a anomalies were primarily due to the weakening of wind speeds, Ekman pumping velocities, and upwelling intensities. In estuarine regions, positive Chl a anomalies were caused by enhanced light availability, whereas in offshore regions, there were attributed to the increased atmospheric wet deposition. These results have improved our understanding of the impact of MHWs on marine ecosystems.