违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 中国北方干旱半干旱区降水的多年代际变化特征及其与太平洋年代际振荡的关系-The Multidecadal Variability of Precipitation in Arid and Semi-arid Region of Northern China and Its Relationship with PDO Index
doi:  10.3878/j.issn.1006-9585.2016.16036
中国北方干旱半干旱区降水的多年代际变化特征及其与太平洋年代际振荡的关系

The Multidecadal Variability of Precipitation in Arid and Semi-arid Region of Northern China and Its Relationship with PDO Index
摘要点击 150  全文点击 19  投稿时间:2016-02-06  修订日期:2016-08-17
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基金:  
中文关键词:  降水,干旱半干旱区,多年代际变化,太平洋年代际振荡,集合模态经验分解(EEMD)
英文关键词:  Precipitation, Arid  and semi-arid  region, Multidecadal  variability, Pacific  decadal oscillation, Ensemble  empirical mode  decomposition
        
作者中文名作者英文名单位
从靖Cong Jing天津市气象台
赵天保Zhao Tianbao中国科学院东亚区域气候-环境重点实验室
马玉霞Ma Yuxia兰州大学大气科学学院
引用:从靖,赵天保,马玉霞.2017.中国北方干旱半干旱区降水的多年代际变化特征及其与太平洋年代际振荡的关系[J].气候与环境研究
Citation:Cong Jing,Zhao Tianbao,Ma Yuxia.2017.The Multidecadal Variability of Precipitation in Arid and Semi-arid Region of Northern China and Its Relationship with PDO Index[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      基于最新版本的全球降水气候中心 (Global Precipitation Climatology Centre, GPCC_V7)资料与欧洲中期数值预报中心20世纪再分析资料(ERA_20C)融合的百年尺度逐月降水资料 (1901-2012年),运用集合经验模态分解方法(EEMD)、合成分析等方法系统分析了我国北方干旱半干旱区降水多年代际变化特征及与太平洋年代际振荡(PDO)之间的相互关系。结果表明:北方干旱半干旱区大多数区域降水都具有50-60年的平均变化周期,而PDO对大多数地区降水多年代际变化特征具有明显的调制作用;其中新疆北部和内蒙古北部的降水与PDO呈现出显著的正相关,而河套东西部地区的降水则与PDO的变化呈现显著负相关。进一步分析表明,当PDO为暖相位时,径向环流增强使得北冰洋水汽南下,当遇到低空北上的阿拉伯海域暖湿气流时,会造成新疆中南部的降水增多;另一方面,PDO暖相位时赤道西太平洋及印度洋区域通过对流加热的作用激发了太平洋-日本/东亚-太平洋(PJ/EAP)遥相关型的产生,这有利于渤海湾暖湿水汽输送至干旱半干旱区北部区域,增大降水概率;同时,当偏北和偏西气流在河套北部区域相遇时会形成降水中心。当PDO位于冷位相时,结论则反之。
Abstract:
      Based on the data of both GPCC_V7 and ERA_20C monthly precipitation, mainly using ensemble empirical mode decomposition (EEMD) and composition analysis method to analyze the multidecadal change of arid and semi-arid region in northern China and the relationship between mdv and Pacific Decade Oscillation (PDO).The result shows: the precipitation of arid and semi-arid region in northern China has a multidecadal variability with about 50-60 years mean period which may be modulated by PDO. The northern Xinjiang and Inner Mongolia is significant positive correlation, while the east and west to Hetao is significant negative correlation. The further study shows, the strengthening of meridional circulation make water vapor of Arctic Ocean flow southward on positive PDO phase. As a result, the precipitation of Xinjiang is increased by the converging of northwest cold-wet flow from Arctic Ocean and southwest warm-wet flow from Arabian Sea in southern Xinjiang. On the other hand, the convection heating of equatorial western Pacific Ocean and Indian Ocean led to the Pacific-Japan/East Asia-Pacific(PJ/EAP) pattern of teleconnection. It is benefit to transport wet flow from Bohai sea to northern area and increase precipitation on positive PDO phrase. Besides, the wet north flow from Bohai and west flow converges in northern Hetao area and shows a maximum precipitation center.The conclusion is the opposite on the negative PDO phrase.
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