大气科学2017，Vol.41Issue(3)：593-602,10.DOI:10.3878/j.issn.1006-9895.1608.16174
全球不同空间尺度陆地年降水的年代尺度变化特征
Decadal Characteristics of Global Land Annual Precipitation Variation on Multiple Spatial Scales
摘要
Abstract
Based on 1951-2010 Global Precipitation Climatology Centre monthly precipitation dataset,decadal characteristics of annual precipitation over the globe,the Eastern and Western Hemispheres,five continents and four typical arid and semi-arid regions were analyzed using the Ensemble Empirical Mode Decomposition (EEMD) method.The results showed that:(1) there exists a decadal oscillation in global land precipitation in addition to a long-term trend.Compared to the long-term trend,the decadal oscillation is more distinct and it is the major phenomenon in global land precipitation.(2) On the hemisphere scale,decadal characteristics of the Eastern and Western Hemispheres are opposite before 2000,with a drying trend over the Eastern Hemisphere and an wetting trend over the Western Hemisphere.(3) The decadal oscillation,long-term trend,drying period and drought period of precipitation over Eurasia and Africa exhibit an opposite variation with that over North America,South America and Australia during 1951-2010.Five continents tend to enter a wet phase in the recent 10 years.(4) The decadal characteristics of precipitation over the four typical arid and semi-arid areas have distinctly differences.Generally,the long-term trend and multi-decadal oscillation of precipitation over North China and North Africa are opposite with that over North America and central Asia.North China and North Africa are approximately in phase.Although North America and central Asia are both in wet period in the recent years,the beginning year for the wet period is 1975 in North America and 1985 in central Asia.Additionally,North America experiences a dry period during the first wet period (1959-1968) in central Asia.关键词
陆地降水/年代尺度/不同空间尺度/EEMD (Ensemble Empirical Mode Decomposition)方法Key words
Land precipitation/Decadal oscillation/Different spatial scales/EEMD (Ensemble Empirical Mode Decomposition) method分类
天文与地球科学引用本文复制引用
徐保梁,杨庆,马柱国..全球不同空间尺度陆地年降水的年代尺度变化特征[J].大气科学,2017,41(3):593-602,10.基金项目
国家重点研发计划项目2016YFA0600404,全球变化国家重大研究计划项目2012CB956201,国家自然科学基金项目41275085,公益性行业(气象)科研专项项目GYHY201506001-1、GYHY201106028,江苏省气候变化协同创新中心 （气象）
National Key Research and Development Program of China (Grant 2016YFA0600404),National Basic Research Program of China (Grant 2012CB956201),National Natural Science Foundation of China (Grant 41275085),China Special Fund for Meteorological Research in the Public Interest (Grant GYHY201506001-1,GYHY201106028),Jiangsu Collaborative Innovation Center for Climate Change （Grant 2016YFA0600404）
