亚洲夏季风建立期间全球热带大气环流模态分析  

Mode Analysis of Global Tropical Circulation during Asia Summer Monsoon Onset

作　　者：张东凌[1] 于杰[2] 赵艳玲 Zhang Dongling;Yu Jie;Zhao Yanling(Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;College of Environmental, Northeast Normal University, Changchun 130024, China;Unit 61741, PLA, Beijing 100094, China)

机构地区：[1]中国科学院大气物理研究所 [2]东北师范大学环境学院 [3]解放军61741部队

出　　处：《气象与减灾研究》2018年第4期241-253,共13页Meteorology and Disaster Reduction Research

基　　金：国家自然科学基金项目(编号:41371495);国家科技支撑计划课题项目(编号:2013BAk05B01)

摘　　要：利用NCAR/NCEP提供的1948—2003年5月标准等压面的月平均风场资料,对亚洲夏季风建立期间全球热带风场进行复EOF分析,揭示各模态的特点及其与亚洲夏季风建立之间的联系,确定各模态在亚洲夏季风建立期间的地位和作用。结果表明,第一模态反映了除赤道地区外的热带地区高层纬向二波异常和低层的信风异常。其时间系数与ENSO有较好的对应关系,20世纪60年代以后时间系数呈下滑态势,可能与全球变暖有关。该模态是ENSO模态。第二、三模态的空间场分别与南亚、南海夏季风的环流密切相关,其时间系数也与南亚、南海夏季风建立的早晚有较好的对应关系。这两个模态分别是南亚、南海夏季风模态。各模态均表现出准20 a的年代际变化,这与北太平洋主要气候模态PDO的年代际变化相同,各模态的年际变化也显著。The dynamic statistic diagnosis was done for global tropical circulation in May, and the relationship between ENSO and Asia summer monsoon are discussed. Based on the 1948-2003 NCAR/NCEP reanalysis data, the deviation wind fields at 1 000, 850, 700, 500, 300, 200 and 50 hPa are regarded as whole to analyze the wind fields by the CEOF analysis method. The results are showed that in the first mode, the circulation of zonal two waves except the equatorial zone in 200 hPa and the abnormal trade wind in 850 hPa presented abnormalities respectively. After the year of 1960, the time coefficient sequence presented a downtrend. The time coefficient was corresponding to ENSO event. The first mode was the mode of ENSO event. The second mode was the mode of South Asia summer monsoon. The third mode was the mode of South China Sea summer monsoon. Interdecadal change of 20 years was obvious in every mode. The period of the change was same as PDO. Interannual change is also obvious in every mode.

关 键 词：热带大气环流 模态分析 ENSO 南亚夏季风 南海夏季风 

分 类 号：P434[天文地球—大气科学及气象学]