东亚副热带西风急流变化特征及其与长江中下游地区夏季降水关系研究  

Research on Variation Characteristics of Subtropical Westerly Jet in East Asia and Its Relationship with Summer Precipitation in the Middle and Lower Reaches of the Yangtze River

作　　者：彭筱[1] PENG Xiao(Lanzhou Central Meteorological Station,Lanzhou Gansu 730020)

机构地区：[1]兰州中心气象台

出　　处：《河南科技》2019年第17期146-149,共4页Henan Science and Technology

摘　　要：本文研究急流强度指数与长江中下游地区夏季降水关系时,发现急流强度与长江中下游地区降水有很好的正相关关系。当急流偏强时,西北太平洋副热带高压偏强,位置偏西偏南,长江中下游地区低层有较强的辐合气流,对应高层有较强的气流辐散,气流上升运动增强,降水偏多;急流偏弱时,西太平洋副热带高压偏弱,位置偏东偏北,长江中下游地区低层的风场辐散,上升气流较偏弱,降水偏少。本文利用CMIP5的BCC_CSM气候系统模式检验了该模式对东亚副热带西风急流的模拟性能,结果表明该模式没有较好地模拟出急流的年际、年代际变化。This paper studied the relationship between jet intensity index and summer precipitation in the middle and lower reaches of the Yangtze River,it is found that there is a good positive correlation between jet intensity and pre?cipitation in the middle and lower reaches of the Yangtze River.When the intensity index of the East Asian subtropi?cal westerly jet is strong,the position of the jet axis is south,and the precipitation in the middle and lower reaches of the Yangtze River is more in summer.When the intensity index of the East Asian subtropical westerly jet is weak,the position of the jet axis is north,and the precipitation in the middle and lower reaches of the Yangtze River is less in summer.This paper used the BCC_CSM climate system model of CMIP5 to test the simulation performance of the model for the East Asian subtropical westerly jet.The results showed that the model does not simulate the interannual and interdecadal variations of the jet well.

关 键 词：东亚副热带西风带急流 急流强度 长江中下游 

分 类 号：P426.615[天文地球—大气科学及气象学]