首页|青藏高原及其周围地区大气热源对川渝盆地夏季降水的影响

青藏高原及其周围地区大气热源对川渝盆地夏季降水的影响

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利用NCEP/NCAR再分析资料和中国地面观测站的逐日降水资料,分析了青藏高原及其周围地区大气热源异常变化对川渝盆地夏季西涝东旱及东涝西旱发生的影响.结果表明,青藏高原东部经长江流域到渤海附近地区以及孟加拉湾到中南半岛附近地区大气热源减弱时,引起高纬冷空气和低纬暖湿气流向川渝盆地西部汇合,大量的水汽被输送到川渝盆地西部辐合上升形成降水,而东部地区的环流形势则不利于水汽辐合,最终导致西涝东旱;相反,青藏高原东部经长江流域到渤海附近、中南半岛经中国南海到菲律宾附近地区和中国西北部及蒙古国附近地区的热源加强时,引起高纬冷空气及低纬暖湿气流向川渝盆地东部汇合,大量的水汽被输送到川渝盆地东部辐合上升形成降水,西部地区环流形势也不利于水汽辐合,造成东涝西旱.
Impact of Heat Source over Qinghai-Xizang Plateau and Its Surrounding Areas on Rainfall in Sichuan-Chongqing Basin in Summer
Using the NCEP/NCAR reanalysis data and observed daily rainfall from gauge stations,analyze the relationship between atmospheric heat source (hereafter called 〈 Q1 〉) over the Qinghai-Xizang Plateau(QXP) and its surrounding areas and precipitation in the Sichuan-Chongqing basin in the summer has been studied in this paper,The result shows that:when the heat source (hereafter called 〈 Q1 〉) over the areas that from the eastern of the QXP via the Yangtze River Basin to the Bohai Bay and its surrounding areas and from the Bay of Bengal to the Indo-China Peninsula are weakened,lead to the cool air over the high latitude and the warm air over the low latitude convergence over the west of Sichuan-Chongqing basin,thereby,most moisture was transported to the west of Sichuan-Chongqing basin,convergent and ascend lead to the rainfall occurred in this region,and the circulation over the east of Sichuan-Chongqing basin is unfavor the moisture convergent in this region,lend to the flood in the west and drought in the east; reversely,when the 〈 Q1 〉 over the areas that from the eastern of the QXP via the Yangtze River Basin to the Bohai Bay and its adjacent region,and from the Indo-China Peninsula to Philippines and its surrounding areas across the South China sea,and the northwest in China and the Mongolia and its adjacent areas are strengthened,lead to the cool air over the high latitude and the warm air over the low latitude convergence over the east of Sichuan-Chongqing basin,thereby,most moisture was transported to the east of Sichuan-Chongqing basin,convergent and ascend lead to the rainfall occurred in this region,and the circulation over the west of Sichuan-Chongqing basin is disadvantage for the moisture convergent in this region,lend to the flood in the east and drought in the west.

The Qinghai-Xizang PlateauAtmospheric heating sourceThe Sichuan-Chongqing BasinThe drought-flood anomalies

岑思弦、巩远发、赖欣

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中国气象局成都高原气象研究所,成都610072

成都信息工程学院大气科学学院/高原大气与环境四川省重点实验室,成都610225

中国科学院寒区旱区环境与工程研究所,兰州730000

青藏高原 大气热源 川渝盆地 旱涝异常

国家自然科学基金公益性行业(气象)科研专项高原大气与环境四川省重点实验室开放课题四川省气象局青年基金

41275080,41305082GYHY201006023PAEKL-2010-C3,PAEKL-2013-C4

2014

10.7522/j.issn.1000-0534.2013.00122

高原气象
中国科学院寒区旱区环境与工程研究所

高原气象

CSTPCDCSCD北大核心
影响因子：2.193
ISSN：1000-0534
年,卷(期)：2014.33(5)
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