摘要
为了掌握南亚高压活动变化的一般规律，为中长期天气预报提供新的预报思路。利用Fortran数据处理及DrADS等绘图工具处理1960～2010年NCEP／NCAR逐日及月平均再分析高度场资料，水平分辨率为2．5°×2．5°经纬网格，并依据大气环流观测事实及天气学原理，系统地分析了南亚高压多年平均变化特征。结果表明：南亚高压强度、中心位置经纬度及东伸脊点存在明显的季节性变化特征。具体表现如下：从当年1—7月一翌年1月，南亚高压中心强度呈由弱-最强-弱的波动变化特征；冬季南亚高压主体位于西太平洋，而在春季北跳上亚洲大陆，但未形成闭合高压中心，夏季南亚高压主体位于亚欧大陆-西太平洋，成为100hPa上最强大最稳定的闭合环流系统；冬季，其主体位置东退至120。E以东的洋面。南亚高压初次形成闭合中心的时间为5月第1侯；初次上青藏高原的平均时间是6月第1候；退出亚洲大陆的时间为11月第2侯。南亚高压东伸脊点的东西位移在夏季的7月和8月也有周期为10天左右的明显振荡周期变化特征。
In order to acquire the rule of variation of the South Asia High activity and provide new prediction ideas for long-term weather forecast. Using Fortran and DrADS as the tools of data processing and drawing to process the 1960- 2010 NCEP/NCAR reanalysis data （the horizontal resolution is 2.5°- 2.5°latitude-longitude grid） , according to the observation of the atmospheric circulation and learning principle, this paper systemically investigate characteristics of the annual mean of South Asia High and main results are as follows： the central strength, the latitude and longitude of the center and eastern ridge point of the South Asia high have obvious seasonal variation characteristics. The main performances are as follows： From January of the first year to July, then to January of the second year, the strength of South Asia high is from the weakest to the strongest, and then to the weakest. The main location of the South Asia high is in western Pacific Ocean in winter. Then jump on the Asia continent in spring, but do not form closed high-pressure center. In summer, the South Asia High located in Eurasia-western Pacific Ocean, becoming the most powerful and stable closed circulation system. Then the main location of South Asia High retreat to the 120~E east of Ocean-surface. Besides, the first time of the South Asia High jump on the Eurasian land is the fifth pentad of March, form closed center is the first pentad of May, jump on the Qinghai-Tibet plateau is the first pentad of June, moves away from the Asian mainland is the second pentad of November. The main location of eastern ridge point of the South Asia high also has obvious longitudinal oscillation in the summer （July and August）, the cycle is about 10 days.
出处
《成都信息工程学院学报》
2013年第2期155-161,共7页
Journal of Chengdu University of Information Technology
基金
公益性行业(气象)科研专项资助项目(GYHY201206042)
成都信息工程学院高原大气与环境四川省重点实验室开放基金项(PAKL-2010-C1)资助
关键词
气象学
气候特征
南亚高压
变化特征
meteorology
climatic characteristics
South Asia High
change characteristics
