文献类型：期刊文献

中文题名：MJO对南海夏季降水的调制及其对海洋表层盐度的影响

英文题名：The Modulation of MJO on Precipitation and Its Effect on Sea Surface Salinity in the Summer South China Sea

作者：谢晓丽[1,2,3];杨婧灵[1,2,3];凌征[1,2,3]

机构：[1]广东海洋大学海洋与气象学院,广东湛江524088;[2]陆架及深远海气候、资源与环境广东省高等学校重点实验室,广东湛江524088;[3]广东海洋大学海洋近海海洋变化与灾害预警实验室,广东湛江524088

年份：2022

卷号：40

期号：2

起止页码：209

中文期刊名：海洋科学进展

外文期刊名：Advances in Marine Science

收录：CSTPCD、、CSCD2021_2022、北大核心、CSCD、北大核心2020

基金：广东海洋大学启动经费资助项目——热带气旋与地形相互作用对南海影响研究(R17073)。

语种：中文

中文关键词：降水;MJO;盐度;南海

外文关键词：precipitation;MJO;salinity;the South China Sea

中文摘要：基于向外长波辐射、降水、大气再分析资料和HYCOM(HYbrid Coordinate Ocean Model)盐度等资料,研究了MJO(Madden-Julian Oscillation,热带大气季节内振荡)对南海夏季降水的调制,并初步探讨了其对海洋表层盐度的影响。结果显示:MJO对南海夏季降水有显著的调制作用,导致南海降水具有强的季节内变化,其最显著周期为45 d。降水季节内信号在泰国湾北部、吕宋岛以西和台湾岛西南等迎风坡区域较强,而在越南外海的安南山脉背风区域较弱,且降水信号会随着MJO信号向东北方向移动。MJO对流抑制(活跃)中心所在区域,低层大气辐聚减弱(增强),中层大气对流减弱(增强),导致降水减少(增加);此外,MJO对流抑制(活跃)中心伴随的反气旋式(气旋式)环流会改变风场,风场减弱(增强)使得迎风区域的降水减少(增加)。MJO引起的降水异常进一步影响南海盐度,南海表层盐度也有明显的季节内变化特征,其显著周期和降水基本一致,为47 d,且盐度异常信号也随降水异常向东北移动。本研究结果有助于进一步了解南海降水和表层盐度的季节内变化特征。

外文摘要：The modulation of MJO(Madden-Julian Oscillation)on the summer precipitation and its effect on sea surface salinity in the South China Sea is investigated based on the outgoing longwave radiation,precipitation,atmospheric reanalysis data and HYCOM salinity,with the composite analysis,significance test and correlation analysis.The MJO has significant modulation effects on the summer precipitation in the South China Sea,which exhibits strong intraseasonal variation with period of 45 days.The intraseasonal signal of precipitation shows significant changes in the windward slope including the northern Gulf of Thailand,the west of Luzon Island and the southwestern Taiwan Island,while weak in the leeward slope of the Annam mountains near Vietnam,and moves northeastward with the MJO signal.The analysis of dynamic factors suggests that the impact of the convergence in the lower troposphere and the convection in the middle troposphere is suppressed(enhanced)in the region of inactive(active)MJO convection,leading to low(high)precipitation.The influence between wind and anticyclonic(cyclonic)circulation followed by inactive(active)MJO convection shows that weak(strong)wind maintain lower(high)precipitation in the windward slope.The MJO-induced anomalous precipitation also influences the salinity of the South China Sea,causing strong intraseasonal variation in salinity with period is 47 days.The salinity anomaly signal moves northeastward with the precipitation anomaly.