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。 斯堪的纳维亚遥相关对我国西南西部深秋降水的影响-The Impact of Scandinavian Pattern on Late Autumn Rainfall in the Western Region of Southwest China
doi:  10.3878/j.issn.1006-9585.2016.16029
斯堪的纳维亚遥相关对我国西南西部深秋降水的影响

The Impact of Scandinavian Pattern on Late Autumn Rainfall in the Western Region of Southwest China
摘要点击 378  全文点击 88  投稿时间:2016-01-27  最后修改时间:2016-02-29
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基金:  国家自然科学基金91437219和41275088;公益性行业(气象)科研专项GYHY201406001;中国科学院战略性先导科技专项XDA11010402
中文关键词:  斯堪的纳维亚遥相关  西南  深秋  降水
英文关键词:  Scandinavian teleconnection  Southwest China  late autumn  rainfall
     
作者中文名作者英文名单位
刘扬LIU Yang中国科学院大气物理研究大气科学和地球流体力学数值模拟国家重点实验室
刘屹岷LIU Yimin中国科学院大气物理研究大气科学和地球流体力学数值模拟国家重点实验室
引用:刘扬,刘屹岷.2017.斯堪的纳维亚遥相关对我国西南西部深秋降水的影响[J].气候与环境研究
Citation:LIU Yang,LIU Yimin.2017.The Impact of Scandinavian Pattern on Late Autumn Rainfall in the Western Region of Southwest China[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      使用中国台站降水数据和NCEP/NCAR再分析资料,分析了1961-2012年深秋斯堪的纳维亚(SCA)型环流异常与同期我国西南西部降水的关系,以及SCA型环流异常影响西南西部降水的具体物理过程。结果表明:SCA型遥相关与西南西部降水存在显著的负相关关系,且具有非对称性:SCA正位相时西南西部降水偏少,而SCA负位相与西南西部降水的关系不显著。SCA正位相年西南西部的降水偏少与该地区对流层中下层的异常下沉运动有关,垂直运动方程诊断结果表明该异常下沉运动主要是由冷平流异常维持。气候态风场对温度异常场的平流对西南西部的冷平流异常起主要作用。正位相SCA型激发的Rossby波向下游传播,使东亚大槽减弱,我国西南东部地区气温偏高,在平均西风作用下,西南西部有冷平流异常,造成该地区的异常下沉运动,从而降水偏少。
Abstract:
      Based on Chinese stations rainfall datasets and the NCEP/NCAR reanalysis data, the simultaneous relationship between the Scandinavian teleconnection pattern (SCA) and the precipitation over the western region of Southwest China (WSWC) in late autumn during 1961-2012 is investigated. The results show that there is a significant negative correlation between the SCA index and the rainfall over WSWC. The negative correlation is asymmetric. During the positive SCA years, the rainfall in WSWC is apparently less than normal years. Contrastingly, during the negative SCA years, the relationship between them is not significant. The negative rainfall anomaly during positive SCA years is in consistent with local anomalous descent in the low and middle troposphere. The diagnosis of the vertical motion equation indicates that the local decent is primarily maintained by the anomalous cold temperature advection. The advection of anomalous temperature by mean westerly wind contributes the most to the anomalous cold temperature advection in WSWC. The downstream Rossby wave propagation triggered by the positive SCA pattern weakens the East Asia trough. Consequently, the eastern part of Southwest China becomes warmer. The climatologic westerly wind brings anomalous colder air into the WSWC area, resulting in local downward motion and drought.
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