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首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Observed variability of summer precipitation pattern and extreme events in East China associated with variations of the East Asian summer monsoon
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Observed variability of summer precipitation pattern and extreme events in East China associated with variations of the East Asian summer monsoon

机译：观测到的东亚夏季风变化与东亚夏季风变化相关的极端事件

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摘要

This article presents a comprehensive analysis of interannual and interdecadal variations of summer precipitation and precipitation-related extreme events in East China associated with variations of the East Asian summer monsoon (EASM) from 1979 to 2012. A high-quality daily precipitation data set covering 2076 observational stations in China is analysed. Based on the precipitation pattern analysis using empirical orthogonal functions and the regime shift detection method, three sub-periods of 1979-1992 (period I), 1993-1999 (period II) and 2000-2012 (period III) are identified to be representative of the precipitation variability. Similar significant variability of the extreme precipitation indices is found across four sub-regions in eastern China. The spatial patterns of summer mean precipitation, the number of days with daily rainfall exceeding 95th percentile precipitation (R95p) and the maximum number of consecutive wet days (CWD) anomalies are consistent, but opposite to that of maximum consecutive dry days (CDD) anomalies to some extent during the three sub-periods. However, the spatial patterns of hydroclimatic intensity (HY-INT) are notably different from that of the other three extreme indices, but highly correlated to the dry events. The changes of precipitation anomaly patterns are accompanied by the change of the EASM regime and the abrupt shift of the position of the west Pacific subtropical high around 1992/1993 and 1999/2000, respectively, which influence the moisture transport and contributes to the precipitation anomalies. In addition, the EASM intensity is linked to sea surface temperature anomaly over the tropical Indian and Pacific Ocean through its effects on convective activity over the west Pacific that induces the cyclonic or anticyclonic anomaly over the South China and northwest Pacific.
机译：本文对1979年至2012年中国东部夏季降水和与降水相关的极端事件的年际和年代际变化与1979年至2012年的东亚夏季风（EASM）的变化进行了综合分析。高质量的每日降水数据集涵盖2076对中国的观测站进行了分析。基于使用经验正交函数的降水模式分析和状态偏移检测方法，确定了1979-1992年（第一阶段），1993-1999年（第二阶段）和2000-2012年（第三阶段）的三个子阶段具有代表性。降水变异性。在中国东部的四个次区域中，极端降水指数也有类似的显着变化。夏季平均降水的空间格局，日降水量超过第95个百分位数（R95p）的天数和连续湿日（CWD）的最大异常数是一致的，但与最大连续干旱天（CDD）的异常相反在这三个子阶段中都有一定程度的发展。但是，水文气候强度（HY-INT）的空间格局与其他三个极端指数显着不同，但与干旱事件高度相关。降水异常模式的变化分别伴随着EASM体制的变化和西太平洋副热带高压位置的突变（分别在1992/1993年和1999/2000年左右），这影响了水分的输送并导致了降水异常。 。此外，EASM强度与热带印度洋和太平洋海面温度异常有关，这是由于其对西太平洋对流活动的影响而引起的，这引起了华南和西北太平洋的气旋或反气旋异常。

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