利用LPAC图分析北半球夏半年环流季节转换及异常
投稿时间:2004-06-17  修订日期:2005-03-28  点此下载全文
引用本文:
摘要点击次数: 518
全文下载次数: 490
作者单位
蔡新玲 南京信息工程大学, 大气科学系, 江苏, 南京, 210044
陕西省气象局, 陕西, 西安, 710015 
王盘兴 南京信息工程大学, 大气科学系, 江苏, 南京, 210044 
杜继稳 陕西省气象局, 陕西, 西安, 710015 
刘子臣 陕西省气象局, 陕西, 西安, 710015 
基金项目:国家自然科学基金资助项目(40233037)
中文摘要:用NCEP/NCAR再分析月平均风、压场资料得到1958—1997年5—10月月际场的局地型相似系数(LPAC)。多年平均LPAC表明了对流层和平流层低层印度夏季风环流的建立、东亚夏季风环流的北进和南亚高压上高原的过程,这些区域LPAC值较同纬度非季风区明显偏低。在平流层中层,夏季型环流表现出纬向对称性和由高纬向低纬的传播特征。对东亚LPAC气候变率时空剖面及3个涝年LPAC异常的分析反映出环流型季节转变异常及其与东亚月降水异常的关系。
中文关键词:局地型相似系数  大气环流  季节转换  气候及异常
 
Analysis on Seasonal Transition and Anomaly of General Circulation in Summer Half Year around the Northern Hemisphere by LPAC Map
Abstract:Based on the NCEP/NCAR reanalyzed monthly wind and pressure dataset,the Local Pattern Analogue Coefficient(LPAC) map of May-September inter-monthly field between 1958—1997 is calculated.The long term averaged LPAC map fairly reflects the processes of the establishment of India summer monsoon circulation pattern,the northward movement of east Asia summer monsoon circulation,and the south Asia high moving up the Tibet Plateau in the troposphere and lower stratosphere,and the LPAC in those areas is significantly lower than that in non-monsoon area of the same latitude.In the middle stratosphere,the establishment of summer pattern circulation shows a character of longitudinal symmetry of LPAC and the propagation of the low value area of LAPC from high to low latitude.Moreover the spatial-temporal cross-section of East Asian LPAC climatic variability and three flood years LPAC anomaly maps are analyzed,and the result indicates that those maps objectively reflect the anomaly of the seasonal transition of circulation pattern and it’s relationship with the anomaly of East Asian monthly precipitation.
keywords:local pattern analogue coefficient(LPAC)  atmospheric circulation  seasonal transition  climate and anomaly
查看全文  查看/发表评论  下载PDF阅读器