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气象:2004,30(5):3-7
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近50年青岛夏季降水变化趋势及其可能原因
(1.山东省青岛市气象局,266003;2.中国科学院大气物理研究所)
Analysis of Precipitation Change in Qingdao Station for Last 50 Years and Its Causes
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中文摘要: 利用Morlet小波变换分析了青岛站近100a夏季降水变化的多层次时间尺度结构,表明该站夏季降水存在显著的准50a周期,而近50a来该站夏季降水却呈明显的下降趋势,在上世纪70年代末由一个相对多雨期跃变为一个相对少雨期。利用NCEP/NCAR再分析资料初步讨论了近50a夏季降水减少的可能原因:由于上世纪70年代末海平面气压场和海温场出现了一次明显的年代际变化,导致东亚夏季风环流减弱,青岛站夏季降水同时期发生突变,降水出现偏少的趋势。
Abstract:Based on monthly mean temperature and precipitation during 100 years (1899—1999) in Qingdao,the trend of summer climatic change is investigated. The main results are as follows: summer temperature has obviously increased,the variation of precipitation is not remarkable over the last 100 years,however,there are dry (wet) and cold (warm) period of alternative changes,but,the tend of summer precipitation in the last 5 decades is remarkably decreased. Such consequence is chiefly affected by the decreasing summer monsoon and SST in the Pacific.
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引用文本:
丁锋,周顺武,2004.近50年青岛夏季降水变化趋势及其可能原因[J].气象,30(5):3-7.
,2004.Analysis of Precipitation Change in Qingdao Station for Last 50 Years and Its Causes[J].Meteor Mon,30(5):3-7.