华北汛期水汽条件的年代际特征分析  

The Interdecadal Variabilities of Moisture Conditions During the Rainy Season over North China

作　　者：刘海文[1,2] 田淑欣[3] 杜建华 

机构地区：[1]成都信息工程学院大气科学学院,成都610225 [2]成都信息工程学院高原大气与环境四川省重点实验室,成都610225 [3]山西省气象台,太原030006 [4]高平市气象局,山西高平048400

出　　处：《山东气象》2010年第2期1-4,共4页Journal of Shandong Meteorology

摘　　要：利用NCEP/NCAR逐日再分析资料,使用合成分析等方法,分析了华北汛期水汽条件的年代际变化特征,结果表明:大气对华北汛期的水汽输送以及华北区域的水汽收支有明显的年代际变化。以1978年为界,先前以异常西南风对华北进行水汽输送的改变为以后的异常东北风的水汽输送,先前以异常东风水汽输送的改变为以后的异常偏西风水汽输送,先前以异常偏西风水汽输送的改变为以后的异常偏东风水汽输送。对于华北区域而言,先前由南边界和西边界的异常水汽输送,改变为以后的由北边界和东边界异常水汽输送,华北地区水汽由以前的异常水汽辐合和盈余,改变为以后的异常水汽辐散和亏损。The interdecadal variabilities of moisture conditions are analyzed during the rainy season over North China based on the NCEP/NCAR reanalysis daily data by means of composite analysis methods. The results are follows： there are apparent interdecdal variabilities both moisture transport and regional water vapor budget over North China during the flood season before and after 1978. Moisture transport over North China has changed from former anormal southwest wind to the later anormal northeast wind, from former anormal east wind to later west wind, and from former anormal west wind to later east wind, Meanwhile, anormal moisture transport have also changed from south and east boundary to from north and west boundary.Water vapor over North China changed from former convergence and surplus to later divergence and deficit.

关 键 词：华北汛期 水汽条件 年代际变化 

分 类 号：P426[天文地球—大气科学及气象学]