Recent Changes in ENSO Teleconnection over the Western Pacific Impacts the Eastern China Precipitation Dipole
Recent Changes in ENSO Teleconnection over the Western Pacific Impacts the Eastern China Precipitation Dipole
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西太平洋ENSO遥相关近期变化影响中国东部降水偶极子
DOI：
10.1175/jcli-d-16-0235.1
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发表时间：
2016-11-01
影响因子：
4.9
通讯作者：
Huo, Liwei
中科院分区：
文献类型：
--
作者：
Jin, Dachao;Hameed, Saji N.;Huo, Liwei
中国东部降水偶极子（ECPD）特征是长江中下游和河套地区夏季降水之间存在异相关系。热带西太平洋降水偶极子受ENSO遥相关的强烈影响。结果表明，90年代中期前后，中国东部地区降水变率和降水偶极子结构都有明显减弱。通过考虑两个时代来分析这些变化：一个是1979-95年，另一个是1996-2009年。在第一个时期的环流异常的特征是著名的东亚-太平洋/太平洋-日本（EAP/PJ）型，准赤道遥相关型从热带太平洋西部发出。另一方面，在后一个时期，中国东部的降水变率出现作为一个不可分割的一部分，在西太平洋环流异常。相比之下……
AbstractThe eastern China precipitation dipole (ECPD) features an out-of-phase relationship between boreal summer precipitation over the middle and lower reaches of the Yangtze River and the Hetao region to its northwest. The precipitation dipole is strongly influenced by ENSO teleconnections over the western tropical Pacific. Here it is shown that a pronounced weakening of both the rainfall variability over eastern China as well as the precipitation dipole structure occurred around the mid-1990s. The changes have been analyzed by considering two epochs: one during 1979–95 and the other during 1996–2009. The characteristic feature of the circulation anomaly during the first epoch is the well-known East Asia–Pacific/Pacific–Japan (EAP/PJ) pattern, a quasi-meridional teleconnection pattern emanating from the western tropical Pacific. On the other hand, during the latter epoch eastern China precipitation variability occurs as an integral part of the circulation anomalies over the western Pacific. In contrast...