双月刊

ISSN 1006-9895

CN 11-1768/O4

+高级检索 English
夏季次季节尺度副高东西变动特征及其与中国西南降水的关系
作者:
作者单位:

1.云南省气候中心;2.云南大学资源环境与地球科学学院

作者简介:

通讯作者:

基金项目:

国家自然科学基金(41575097,41775073);云南省自然科学基金重点项目(2016FA041)


Characteristics of subseasonal scale zonal movement of subtropical high in summer and its relationship with precipitation in southwest China
Author:
Affiliation:

Department of Resources,Environment and Geosciences,Yunnan University

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    副高是影响中国气候的大尺度环流系统,本文研究了夏季次季节尺度副高东西变动对西南地区降水的影响及其影响的物理过程。首先根据副高东西变动的关键区位置分别定义了前夏和后夏副高东西变动指数,指数具有显著的10-30天次季节周期,能够很好表征副高次季节东西变动特征。根据指数的标准化值,共选取前夏和后夏东西事件195次(1374天)。分析表明次季节尺度上副高东西变动与西南地区降水有十分密切的联系,在副高偏西(东)事件中,副高经历了由东→西→东(西→东→西)逐渐变化的过程,相应西南大部分地区的降水经历了逐渐由少→多→少(多→少→多)变化的过程,次季节尺度上西南降水对副高变化的响应与副高东西变动过程中副高北侧及副高主体区域的水汽和气流的垂直运动有很大的关系。另外,分析发现对于西南地区而言,在副高影响背景下,贵州和重庆地区降水变化的一致性特征比较好,而云南和四川地区降水变化的区域差异比较大,尤其是云南。前夏,在副高东西变动过程中云南大部分地区的降水甚至呈现出与西南大部分地区,尤其是贵州和重庆地区的降水完全相反的特征,即副高偏西事件中,云南大部分地区的降水偏少,相反,副高偏东事件中云南大部地区的降水偏多;后夏,云南中北部地区的降水与其它地区的降水相反。

    Abstract:

    The subtropical high of northwestern Pacific (abbreviated as WPSH) is a large-scale circulation system that affects on the climate in China. In this paper, the influence and the physical processes of the sub-seasonal east-west movement of subtropical high on the southwestern China are investigated. First, the east-west displacement index of the WPSH is defined according to the key position of WPSH movement in early summer and late summer. The index has a significant period of 10-30 days and represents well zonal shift of the WPSH. A total of 195 events (1374 days) are chosen based on standardization value of the index. The results show that the subseasonal scale zonal movement of the WPSH is a closed relation to the precipitation in the southwestern China. During the west (east) events, the WPSH move gradually from east→west→east(west→east→west), and the rainfall in most southwestern China changed from less→more →less(more→less→more). The response of southwest precipitation on the sub-seasonal scale to the WPSH change is closed related to the water vapor and vertical movement of the gas flow in the north side of the WPSH and the main area of the WPSH during the movement process of the WPSH. Otherwise, the analysis shows that, in the condition of the WPSH, the consistency of precipitation in Guizhou and Chongqing is good, but the regional difference of precipitation in Yunnan and Sichuan is very significant, especially in Yunnan. In early summer, in the process of the zonal movement of the WPSH, the precipitation in most parts of Yunnan is even contrary to that in most parts of southwest China, especially in Guizhou and Chongqing. Namely, when WPSH move westward, the precipitation is less in most regions of Yunnan, vise verse. In the late summer, the precipitation in north-central Yunnan is opposite to that in other regions.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-08-21
  • 最后修改日期:2020-03-24
  • 录用日期:2020-04-01
  • 在线发布日期:
  • 出版日期: