沙漠与绿洲气象2017，Vol.11Issue(2)：50-59,10.DOI:10.12057/j.issn.1002-0799.2017.02.008
1981—2010年江淮地区持续性强降水低频特征分析
Properties of the Low Frequency Oscillations of Persistent Heavy Precipitation in the Yangtze-Huai River Valley during 1981-2010
摘要
Abstract
Based on the daily precipitation data at 756 stations in China were provided by the China Meteorological Information Center, and a precipitation index(PRE index)was defined. There are 26 persistent extreme precipitation events were selected in the Yangtze-Huai River valley from June-July 1981-2010. The Ensemble Empirical Mode Decomposition(EEMD)method was applied to investigate oscillation properties of the persistent heavy precipitation events in the Yangtze-Huai River valley. Results indicated that the variance contribution of summer precipitation shows a decreasing trend with the increase of oscillation period in the Yangtze-Huai River valley. According to the low frequency characteristics of persistent heavy rainfall, the selected events can be divided into three categories: events dominated by 10～30 days low frequency oscillation, by both 10～30 days and 30～60 days low frequency oscillation and by 30～60 days low frequency oscillation. The key systems work on persistent heavy precipitation were low frequency anticyclone which was located in the South China Sea to northern Philippines and low frequency cyclone which was located in the East Asia mid-latitudeon low frequency scales. For the second kind event, the low frequency anomaly systems on 30～60 days scale was more stable, which was favorable to the formation of key system on 10～30 days scale. Low frequency activities on these two time scales occur "phase-locked"when the event happens, which make the duration of persistent precipitation longer.关键词
江淮地区/持续性强降水/低频振荡Key words
Yangtze-Huai River valley/persistent heavy precipitation/low frequency oscillation分类
天文与地球科学引用本文复制引用
邓超,李蕾..1981—2010年江淮地区持续性强降水低频特征分析[J].沙漠与绿洲气象,2017,11(2):50-59,10.基金项目
灾害天气国家重点实验室开放课题(2016LASW-B11),2011年度公益性行业(气象)科研专项(GYHY201106003). （2016LASW-B11）
