摘要
利用1948—2011年NCEP/NCAR逐日再分析资料,采用倒算法计算了亚洲地区大气热量源汇的值,分析了中南半岛和青藏高原地区大气热源的候变化特征及南亚高压的位置与两个地区热源变化的关系。结果表明,中南半岛地区上空大气在12候由冷源转变为热源。当中南半岛地区大气热源与东西相邻地区热力梯度减小,且孟加拉湾、中南半岛和菲律宾群岛地区的大气都为热源时,南亚高压中心西移到中南半岛上空。当青藏高原大气热源进入一年中的极大值区时,南亚高压中心盘踞在高原上空,当高原上空大气转变为冷源时南亚高压中心退出高原。中南半岛地区的大气热源对南亚高压的西移有触发作用,而南亚高压中心在青藏高原上空的建立与退出,和高原大气热源的强度和大气环流的突变有关。
Based on NCEP / NCAR daily reanalyzed data from 1948 to 2011,the atmospheric heat sources in Asia are computed by the inverted arithmetic. Then the characteristics of pentad changes of heat sources over Indo-China Peninsula and Tibetan Plateau and the relationship between South Asia High's position and changes of heat sources over above-mentioned zones are analyzed. The results show that it is at pentad 12 when the atmosphere over Indo-China Peninsula shifts from a cold source to a heat one. The centre of the South Asia High moves over the Indo-China Peninsula when the thermal gradient decreases between Indo-China Peninsula and the adjacent areas on its east and west sides and the atmosphere over the Bay of Bengal,Indo-China Peninsula and the Philippine Islands all becomes heat sources. The centre of South Asia High moves over the Tibetan Plateau when the Tibetan Plateau heat source develops into its climax period. And the centre moves out the plateau when the atmosphere over the Tibetan Plateau turns cold. The Indo-China Peninsula heat sources trigger the westward movement of the South High. The entering and exiting of the South High over the Tibetan Plateau are influenced by the heat sources' strength over the plateau and the changes of circulation.
出处
《大气科学学报》
CSCD
北大核心
2015年第5期716-720,共5页
Transactions of Atmospheric Sciences
基金
江苏省气象局科研基金面上项目(KM201213)
关键词
南亚高压
中南半岛
青藏高原
大气热源
South Asia High
Indo-China Peninsula
Tibetan Plateau
heat sources