摘要
观测分析表明,春季Hadley环流异常可以导致东亚大气环流异常变化进而影响长江流域夏季降水的发生。利用中国科学院大气物理研究所9层大气环流模式(IAP9L-AGCM),对春季Hadley环流异常偏强情形下东亚夏季大气环流和长江流域夏季降水的响应进行了数值模拟。模拟结果表明当春季Hadley环流异常偏强时,东亚夏季风减弱,夏季西太平洋副热带高压和南亚高压加强,菲律宾以东洋面对流减弱,长江流域降水增多。初步的数值模拟结果与已有的诊断结果相吻合。
It is indicated by analysis of observed data that spring Hadley circulation anomaly can result in the variability of the East Asian summer atmospheric circulations and further impact the summer precipitation in the Yangtze River valley.A simulation by IAP9L-AGCM is performed on the responses of the East Asian atmospheric circulations and precipitation in the Yangtze River valley to strong spring Hadley circulation.Results show that related to strong spring Hadley circulation,East Asian summer monsoon is weakened and western Pacific subtropical high and South Asian high in summer are strengthened.Convection of east of the Philippines is reduced as well.All of these provide favorable conditions for increasing the precipitation in the Yangtze River valley.the simulation results agree with those from the diagnoses.
出处
《气候与环境研究》
CSCD
北大核心
2008年第2期182-188,共7页
Climatic and Environmental Research
基金
中国科学院知识创新工程重要方向性项目KZCX3-SW-221
国家自然科学基金资助项目4062013011
关键词
数值模拟
HADLEY环流
大气环流
夏季降水
numerical simulation,Hadley circulation,atmospheric circulations,summer precipitation
