摘要
基于1982—2015年高分辨率海气资料,从海表面温度(Sea Surface Temperature, SST)和海表面风速相关关系的角度研究了年际尺度上赤道印度洋的海气关系。结果表明,印度洋的海气关系具有明显区域性和季节性特征,即整个印度洋除赤道东南印度洋和赤道西印度洋SST与海表风速在夏季(7—9月)为显著正相关关系,主要表现为海洋影响大气;其他地区和月份均为负相关关系,主要表现为大气对海洋的强迫作用。回归分析发现,夏季赤道西印度洋SST异常可能通过海平面气压调整机制影响海表面风场,即海温增温使边界层空气增暖,海表面风场辐合增强;反之则相反。此外,还利用AM2.1模式进行模拟试验,试验结果成功地再现了夏季赤道西印度洋海表面温度与海表风速之间的正相关关系。
Based on the high resolution ocean-atmosphere data from 1982 to 2015,this study reveals the ocean-atmosphere relationship in the equatorial Indian Ocean on the inter-annual timescale in terms of the correlation between the Sea Surface Temperature(SST)and sea surface wind speed.The results show that the ocean-atmosphere relationship in Indian Ocean manifests significant regional and seasonal characteristics.The correlation between the SST and surface wind speed anomalies appearred positive only in the western equatorial Indian Ocean and southeast equatorial Indian Ocean during summer(July-September),which was manifested as ocean-to-atmosphere forcing,while the correlations in other regions and months were all negative,which was manifested as atmosphere-to-ocean forcing.The regression analysis shows that the SST anomalies in the western equatorial Indian Ocean during the summer might influence the sea surface wind field via the sea level pressure adjustment mechanism,that is,the sea temperature increase made the boundary layer air warmer,leading to the increase of convergence of sea surface wind field,and vice versa.In addition,the AM2.1 model was used for the simulation test.The test results successfully reproduced the positive correlation between the surface temperature of the western equatorial Indian Ocean and the sea surface wind speed in summer.
作者
何青青
徐海明
张乐英
HE Qingqing;XU Haiming;ZHANG Leying(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster,Ministry of Education,Nanjing University of Information Science & Technology,Nanjing 210044,China;National Demonstration Center for Experimental Atmospheric Science & Environmental Meteorology Education,Nanjing University of Information Science & Technology,Nanjing 210044,China)
出处
《气象科学》
北大核心
2019年第1期1-11,共11页
Journal of the Meteorological Sciences
基金
国家自然科学基金资助项目(41575077
41490643)
关键词
印度洋
海气特征
气压调整机制
Indian Ocean
ocean-atmosphere relationship
pressure adjustment mechanism
