Interannual variability of summer monsoon convective and stratiform precipitations in East Asia during 1998-2013
Interannual variability of summer monsoon convective and stratiform precipitations in East Asia during 1998-2013
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1998-2013年东亚夏季风对流和层状降水的年际变化
DOI：
10.1002/joc.4572
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发表时间：
2016-08-01
期刊：
影响因子：
--
通讯作者：
Fu, Yunfei
中科院分区：
文献类型：
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作者：
Lu, Daren;Yang, Yuanjian;Fu, Yunfei
利用16年（1998-2013年）热带测雨使命（TRMM）雷达降水产品（2A 25和3A 25），分析了夏季东亚季风（SEAM）自治领区域对流和层状降水的年际变化。结果表明，对流降水和层状降水的气候平均型基本相似，但层状降水的面积分数（AF）在东亚夏季占主导地位，可达80%左右。对流性降水产生的降水量与层状云降水相似。东亚夏季对流和层状云降水的RR、AF和贡献率（CF）的年际标准差和变异系数（CV）的空间分布相似，这是由于它们都可能受到SEAM的影响。结果表明，对流降水AF的年际变率（CV）远大于层状降水，而对流降水RR/CF和层状降水RR/CF的CV在大部分地区相似。对流降水的SEAM与RR的年际相关性比层状降水的SEAM与RR的年际相关性强。而在海洋区域则相反。对流层低层SEAM强度主要控制大气稳定度、层状降水和对流降水RR的年际变化。大气稳定度的变化进一步调制了层状和对流降水的AF和CF的年际变化。这项工作主要提供了大尺度环流与对流和层状降水在年际尺度上联系的可能证据。建议在今后的工作中，应利用更多的观测和模式模拟来探索可能的主导机制。
In this paper, interannual variations of convective and stratiform precipitations in summer East Asian monsoon (SEAM) dominion are analysed using 16-year (1998-2013) Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) rain products (2A25 and 3A25). It is found that the climatological mean patterns of convective and stratiform rain rates (RRs) are generally similar to each other, but the area fraction (AF) of stratiform precipitation can always reach about 80% and dominates in summer East Asia. Nonetheless, convective precipitation produces similar rainfall quantity with stratiform rainfall. For the RR, AF and contribution fraction (CF), their interannual standard deviation and coefficient of variation (CV) spatial patterns are similar between summer convective and stratiform precipitations in East Asia, because of the fact that they are all maybe influenced by SEAM. Differently, only the intensity of interannual variability (i.e. CV) for convective precipitation AF is much greater than that for stratiform precipitation, while CV for both convective and stratiform precipitations RR/CF are similar in most areas. Moreover, the interannual variability of SEAM is more highly correlated with that of RR for convective precipitation than that for stratiform precipitation inmost land regions. While the opposite conclusion is found in ocean regions. Generally, the SEAM intensity in the lower troposphere mainly controls interannual variability of the atmospheric stability and both stratiform and convective precipitations RR. Then, atmospheric stability variation further modulates the AF and CF variations of both stratiform and convective precipitations on the interannual scale. This work mainly provides possible evidence of linkage between large-scale circulation and convective and stratiform precipitations on the interannual scale. It suggests that the possible dominant mechanism should be explored using more observations and together with model simulations in the future work.