摘要
利用1980—1999年NECP/NCAR地面气温资料和中国气象局国家气象中心中国汛期雨带类型资料,计算并分析了亚洲地区地面气温与中国汛期雨带位置的关系。结果表明,亚洲地面气温与中国汛期雨带位置关系最好的区域在青藏高原,该地区的地面气温与中国汛期雨带位置之间的正相关关系具有较好的持续性,其中关系最密切的时间是5月份。对相应大气环流的合成分析发现,当5月青藏高原地面气温偏高时,热力作用使得高原地区上升气流加剧,并在115°E,25°N附近强迫出一支相对偏强的下沉气流,导致在110°～120°E,20°～25°N附近出现一个相对的反气旋性环流,该环流有利于夏季西太平洋副热带高压的北上,最终使得中国汛期雨带位置偏北。
Using the surface air temperature data of NECP/NCAR reanalysis and the rainy belt data in Chinese flood season of National Meteorological Center, Chinese Meteorological Administration in 1980\_1999, the relationship between surface air temperature in Asia and rain belt's location in Chinese flood season is analyzed and calculated. The result showed that the closest linkage region between surface air temperature in Asia and rainy belt position in Chinese flood season is in the Qinghai-Xizang Plateau, the positive correlations between them have good persistence, the maximum correlation coefficients appear in May. Through the composite analyses of relevant atmospheric general circulation, it is found when the surface air temperature over Qinghai-Xizang Plateau in May is warmer, the thermal effect makes ascending air current to enhance, and a branch of relative strong descending air current was forced near 115°E, 25°N, causing the relative anticyclonic is appeared near 110°～120°E, 20°～25°N, which is favorable for West Pacific Subtropical High jumping to the north so that the location of rainy belt in Chinese flood season moves north toward.
出处
《高原气象》
CSCD
北大核心
2004年第3期339-343,共5页
Plateau Meteorology
基金
国家重点基础研究发展计划(2003CB415100)
国家自然科学基金(D49965001)共同资助
关键词
地面气温
中国汛期雨带位置
西太平洋副热带高压
青藏高原
热力作用
Surface air temperature
Position of rainy belt in Chinese flood season
West Pacific subtropical high
Qinghai-Xizang Plateau
Thermodynamic effect
