Modulation of marine heatwaves by salinity effect in the Northeast Pacific Ocean in 2013-2014  

作　　者：Xiaokun Wang Hai Zhi Ronghua Zhang Jiaxiang Gao Pengfei Lin 

机构地区：[1]School of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Henan Meteorological Disaster Prevention Technology Center,Zhengzhou 450003,China [3]School of Marine Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China [4]Laoshan Laboratory,Qingdao 266237,China [5]Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China [6]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Acta Oceanologica Sinica》2025年第1期17-27,共11页海洋学报(英文版)

基　　金：The Laoshan Laboratory under contract Nos LSKJ202202403 and LSKJ202202402;the National Natural Science Foundation of China under contract Nos 42030410 and 42406202;the Natural Science Foundation of Jiangsu Province under contract No.BK20240718;the Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology;the Jiangsu Innovation Research Group under contract No.JSSCTD202346;the Jiangsu Funding Program for Excellent Postdoctoral Talent under contract No.2023ZB690.

摘　　要：Marine heatwaves(MHWs)are extreme ocean events characterized by anomalously warm upper-ocean temperatures,posing significant threats to marine ecosystems.While various factors driving MHWs have been extensively studied,the role of ocean salinity remains poorly understood.This study investigates the influence of salinity on the major 2013-2014 MHW event in the Northeast Pacific using reanalysis data and climate model outputs.Our results show that salinity variabilities are crucial for the development of the MHW event.Notably,a significant negative correlation exists between sea surface temperature anomalies(SSTAs)and sea surface salinity anomalies(SSSAs)during the MHW,with the SSSAs emerging simultaneously with SSTAs in the same area.Negative salinity anomalies(SAs)result in a shallower mixed layer,which suppresses vertical mixing and thus sustains the upper-ocean warming.Moreover,salinity has a greater impact on mixed layer depth anomalies than temperature.Model sensitivity experiments further demonstrate that negative SAs during MHWs amplify positive SSTAs by enhancing upper-ocean stratification,intensifying the MHW.Additionally,our analysis indicates that the SAs are predominantly driven by local freshwater flux anomalies,which are mainly induced by positive precipitation anomalies during the MHW event.

关 键 词：marine heatwave salinity effect ocean stratification and mixing sea surface temperature Northeast Pacific Ocean 

分 类 号：P731[天文地球—海洋科学]