中文摘要：

利用1979-2006年NCEP／NCAR大气月平均资料、OLR对流和CMAP降水日平均资料，从季节平均、月平均、季节内振荡不同时间尺度分析了2006年东亚夏季风活动特征及其与雨带分布之间的联系。结果表明，2006年东亚夏季风爆发时间正常，而夏季风推进过程存在异常：前沿在华南地区和华北地区维持时间偏长、在长江流域维持时间偏短，夏季风极端北界偏北，这种推进异常与南海夏季风强度偏强有关。南海夏季风强度偏强及推进过程异常导致东亚夏季（6—8月）降水为Ⅰ类雨带分布，即长江流域降水偏少，华南、黄淮流域-朝鲜半岛-日本中南部降水偏多。从月时间尺度看，2006夏季各月都具有南海地区夏季风强度偏强、前沿位置偏北和偏东的异常趋势；西太平洋副热带高压6月偏西偏南，7、8月偏北，在这种异常形势下，长江流域6、7、8各月降水都偏少，华南地区各月以偏多为主，黄淮流域7、8月降水偏多。从季节内振荡看，2006年大气季节内振荡（ISO）纬向传播与气候平均相比具有特殊性，长江流域纬度带西传波和静止波偏弱，华南地区纬度带东传波和静止波偏强，ISO这种异常与夏季长江流域降水偏少、华南降水偏多有关。

英文摘要：

Activity characteristics of East Asia summer monsoon and their relationship to the rainfall distribution over Eastern China in 2006 are analyzed from multiple （seasonal, monthly and intraseasonal） time scales, using the 1979-2006 NCEP/NCAR monthly mean atmospheric data, OLR convection and CMAP precipitation daily mean data. The results show that the 2006 East Asia summer monsoon was normal in the onset date but abnormal in the advancing process, relative to climatology： the front of the summer monsoon stagnated longer in Southern and Northern China but shorter in the Yangzi River valley and the extreme northern boundary of summer monsoon is more northward. The abnormal advancement was related to a stronger South China Sea summer monsoon, which, acting together with the abnormal progression, result in a pattern of less precipitation from the Yangzi River valley versus more precipitation in Southern China to Yellow River and Huanghe River valleys and then to Korea Peninsula and middle and southern Japan, which is known as Pattern Ⅰ in rainfall distribution over East Asia during summer （Jun.--Aug.）. On the monthly time scale, summer monsoon is stronger in intensity over the South China Sea and its front locates more to the north and east in every summer month. The western Pacific subtropical high is more southward and westward in June and more northward in July and August. Under these conditions, monthly precipitation is all less in the Yangzi River valley and more in Southern China in June, July and August and more in the Yellow River and Huanhe Rivers valleys in July and August, than climatology. On the intraseasonal oscillation （ISO） time scale, the zonal propagation of atmospheric ISO in 2006 had its own uniqueness; the westward and stationary ISO along the latitude belt of the Yangzi River valley was weaker while the eastward and stationary ISO along the latitude belt of Southern China was stronger, as compared to climatology. These abnormal characteristics of ISO are related to a distribution o