%0 Journal Article
%T Seasonal characteristic and interannual variability of the atmospheric hydrological cycle in the Yangtze River basin during the summer monsoon period<br>夏季风期间长江流域的水汽输送状态及其年际变化
%A ZHAO Rui-Xia
%A WU Guo-Xiong
%A ZHANG Hong
%A <br>赵瑞霞
%J 地球物理学报
%D 2008
%I 
%X The atmospheric hydrological cycle over the Yangtze River basin during summer monsoon period is examined using the NCEP/NCAR reanalysis.The primary focus is the linkage between the interannual variability of the moisture convergence in Yangtze River and the large-scale water vapor transport and circulation fields.The southwest wind over the basin is strongest during June to July.The meridional water vapor transport makes convergence over the river in May to August,and divergence over it in September;and the zonal water vapor transport makes divergence over the river in May to July,and convergence over it in August to September.During the period when the summer monsoon is comparatively weaker over the east of China,such as May,August and September,the interannual variation of the water vapor budget over the river is significantly affected by the variation of the south wind across the south boundary.While the Yangtze River is unusually wet,an anomalous low-pressure is established over the east of Qinghai-Tibet plateau for the three months,and an anomalous anti-cyclonic circulation accompanied with a positive air pressure anomaly is established over Indo-China Peninsula as well as its eastern ocean in August and September.These two anomalous circulations all increase the water vapor input through the south boundary.But during the period when the summer monsoon is comparatively stronger over the east of China,such as June and July,the water vapor output by the south wind across the north boundary is evidently increased,and becomes the most vital path for the interannual variation of the water vapor budget over the river.While the river is unusually wet,an anomalous cyclonic circulation accompanied with a negative pressure anomaly is established in June over the Yellow Sea and the East China Sea in mid-latitude,and an anomalous anti-cyclonic circulation accompanied with a positive air pressure anomaly is established in July over the region around the outer Xinganling mountain in mid and high latitude.These two different anomalous circulations all decrease the water vapor output through the north boundary.
%K Yangtze River basin
%K Water vapor cycle
%K Summer monsoon
%K Interannual variability
%K Anomalous circulation<br>长江流域
%K 水汽循环
%K 夏季风
%K 年际变化
%K 异常环流
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=F45646E8A44D36B7F1700148465EC398&yid=67289AFF6305E306&vid=987EDA49D8A7A635&iid=B31275AF3241DB2D&sid=C134FCA51C2CF9D8&eid=B219870B99929345&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=1&reference_num=20