论文部分内容阅读
利用NCEP/NCAR再分析资料计算了1950-2006年夏季（6-8月）南亚高压（SAH）和印度低压（IL）的面积、强度和中心位置指数,并定量分析了SAH、IL的气候和异常特征及其与亚洲季风区大气热源的同期相关关系,结果表明：（1）夏季SAH 7月最强、6月最弱,中心位置6月偏东南,7、8月偏西北;IL 7月最强,中心位置偏西。（2）SAH、IL的年际异常与亚洲季风区热源异常显著相关,但IL与热源的相关明显强于SAH。（3）青藏高原（下称高原）的影响主要表现在SAH、IL中心位置的经度指数异常与同期高原及亚洲内陆与东亚、东北亚间的热源异常型;SAH、IL中心偏东年,热源异常型为西正、东负。高原主体及其邻近地区的热源异常与SAH强度异常无显著相关,而与IL强弱呈显著正相关。“,”Using NCEP/NCAR reanalysis data from 1950 to 2006,A set of seasonal and monthly circulation indices of South Asia High(SAH) and Indian Low(IL) in summer are calculated,including area index(s),intensity index(p) and center position index(λc,φc).The climatic and anomalous characteristics of SAH and IL and their contemporaneous correlation with atmospheric heat source in Asian monsoon area are investigated.The results show that,SAH is the weakest in June and the strongest in July and the center locates southeasterly by the normal in June,but northwesterly in July and August.IL is the strongest in July and the center locates westerly.There is notable correlation between the interannual anomaly of SAH,IL and the anomaly of atmospheric heat source in Asian monsoon area,respectively,but the correlation between IL and atmospheric heat source is higher.The primary effects of the Tibetan Plateau mainly display anomalous types of SAH,IL center position indices λc and atmospheric heat source over the Tibetan Plateau,Asian inland and the area between East Asia and Northeast Asia at the same period;if SAH and IL centers locate easterly,the anomaly of atmospheric heat source is positive in the west and negative in the east.There is no significant correlation between anomaly of atmospheric heat source over the Tibetan Plateau and its neighboring area and South Asia pressure intensity,but significantly positive correlation with IL intensity.