Changes in summer extreme precipitation in Northeast Asia and their relationships with the East Asian summer monsoon during 1961-2009
Changes in summer extreme precipitation in Northeast Asia and their relationships with the East Asian summer monsoon during 1961-2009
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1961-2009年东北亚夏季极端降水变化及其与东亚夏季风的关系
DOI：
10.1002/joc.4683
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Zong Shengwei
中科院分区：
文献类型：
--
作者：
Wang Lei;Wu Zhengfang;He Hongshi;Wang Fuxue;Dua Haibo;Zong Shengwei
利用1961 - 2009年东北亚442个气象站逐日降水资料，分析了东亚夏季极端降水的时空变化及其与东亚夏季风的关系。结果表明，除连续干旱日数（CDD）指数外，各SEP指数的空间分布趋势相似，具有明显的聚类性。呈现增加趋势的台站主要位于中国东部（EC）和西日本西部（WJ）。呈下降趋势的台站主要分布在中国北方和东日本南部。除CDD指数外，EASM指数EASMI和SEP指数之间的相关性的空间格局是相似的。呈下降趋势的台站大多数SEP指数与EASMI呈正相关，反之亦然。1961 - 2009年东南太平洋海温指数变化趋势的空间格局（EC呈上升趋势，NC和东北地区呈下降趋势）与东亚夏季风减弱相关。研究表明，东亚夏季风平均状态变化的控制机制同样适用于SEP，在东亚夏季风弱年，一个强中纬度气旋可能导致EC和日本的区域SEP（1天内一个亚区域20多个站出现R99 p），在东亚夏季风强年，可能导致NC的区域SEP。
On the basis of the daily precipitation records of 442 meteorological stations throughout Northeast Asia (NEA) from 1961 to 2009, this study investigates spatiotemporal changes in summer extreme precipitation (SEP) and the relationship between SEP and East Asia summer monsoon (EASM) in NEA. The results show that the spatial patterns of the trends in SEP indices are similar, with obvious clustering, except for the consecutive dry days (CDD) index. Stations exhibiting increasing trends are mainly located in Eastern China (EC) and the western part of Western Japan (WJ). Stations with decreasing trends are mostly distributed in Northern China (NC) and the southern region of Eastern Japan (EJ). The spatial patterns of the correlations between the EASM index EASMI and the SEP indices are similar, except for the CDD index. Stations that show decreasing trends mostly exhibit positive correlations between SEP indices and the EASMI, and vice versa. The spatial patterns of trends (increasing trends in EC, decreasing trends in NC and Northeast China) in SEP indices between 1961 and 2009 have a correlation with a weakening EASM. This study demonstrates that the mechanism dominating the mean state change of the EASM also applies to SEP. A strong mid‐latitude cyclone could result in a regional SEP (R99p occurred in more than 20 stations over a subregion in 1 day) in EC and Japan in weak EASM years, and could result in a regional SEP in NC in strong EASM years.