El Niño事件消亡期亚洲季风区对流层上层经向热力差异的演变  

Evolution of Meridional Thermal Difference in the Upper Troposphere of the Asian Monsoon Region during the Disappearance of El Niño Event

作　　者：周亿萍 罗小青[1] Zhou Yi-ping(Guangdong Ocean University,Zhanjiang,Guangdong 524088)

机构地区：[1]广东海洋大学,广东湛江524088

出　　处：《农业灾害研究》2023年第5期67-69,73,共4页Journal of Agricultural Catastrophology

摘　　要：采用NOAA1979—2019年的南方涛动SOI指数、GPCC降水数据和ERA5气温数据探究El Niño事件消亡期亚洲季风区对流层上层海陆热力差异的演变特征。El Niño事件衰减期按所处季节可分为春季型、秋季型和冬季型,其中冬季型衰减对季风区对流层上层经向热力差(TIup)的贡献最大,且热力差异在冬季达到最大;春季型衰减会使伴随长江中下游夏季降水增加,秋季型衰减会使长江中下游夏季降水减少,冬季型衰减会使华北大部分地区夏季降水增多,只有华南、西南及东北部分地区降水略有减小。Using the NOAA Southern Oscillation SOI index,GPCC precipitation data and ERA5 temperature data from 1979 to 2019 to explore the evolution characteristics of the thermal difference between the upper troposphere and land in the Asian monsoon region during the disappearance of El Niño event.The El Niño event attenuation period can be divided into spring type,autumn type and winter type according to the season.The winter type attenuation has the largest contribution to the meridional thermal difference(TIup)in the upper troposphere of the monsoon region,and the thermal difference reaches the maximum in winter;The spring type attenuation will increase the summer precipitation in the middle and lower reaches of the Yangtze River,the autumn type attenuation will reduce the summer precipitation in the middle and lower reaches of the Yangtze River,and the winter type attenuation will increase the summer precipitation in most parts of North China,only the precipitation in parts of South China,Southwest and Northeast China will decrease slightly.

关 键 词：El Niño衰减期 亚洲季风区 海陆热力差异 降水 

分 类 号：P461.2[天文地球—大气科学及气象学]