湖北农业科学 ›› 2021, Vol. 60 ›› Issue (23): 62-67.doi: 10.14088/j.cnki.issn0439-8114.2021.23.013

• 资源·环境 • 上一篇    下一篇

太平洋海温异常对湖南冬季雨凇的影响

李易芝1, 罗伯良1, 廖玉芳1, 郭凌曜2, 段丽洁2   

  1. 1.湖南省气象科学研究所/气象防灾减灾湖南省重点实验室,长沙 410118;
    2.湖南省气候中心,长沙 410118
  • 收稿日期:2020-09-01 出版日期:2021-12-10 发布日期:2021-12-21
  • 通讯作者: 廖玉芳(1962-),女,正高职高级工程师,主要从事气象灾害研究工作,(电子信箱)lyf_13975681873@163.com。
  • 作者简介:李易芝(1988-),女,工程师,硕士,主要从事灾害性天气气候诊断分析与预测方法研究工作,(电话)13875876886(电子信箱)girl.lyz@163.com;
  • 基金资助:
    湖南省气象局短平快课题(XQKJ20B033)

The influence of Pacific SST anomaly on winter glaze in Hunan province

LI Yi-zhi1, LUO Bai-liang1, LIAO Yu-fang1, GUO Ling-yao2, DUAN Li-jie2   

  1. 1. Institute of Meteorological Science of Hunan Province/Key Laboratory of Preventing and Reducing Meteorological Disaster,Changsha 410118,China;
    2. Hunan Climate Center,Changsha 410118,China
  • Received:2020-09-01 Online:2021-12-10 Published:2021-12-21

摘要: 基于1961—2018年湖南89个气象观测站雨凇资料、NCEP/NCAR再分析资料及Hadley中心月平均海温资料等,分析太平洋海温异常对湖南冬季雨凇日数的影响。结果表明,前期7—9月太平洋海温南正北负的偶极子分布型与湖南冬季雨凇日数存在显著的正相关关系。当海温指数偏高时,后期冬季200 hPa长江以北西风急流偏强,500 hPa乌拉尔山附近位势高度偏高,东亚中高纬位势高度偏低,西伯利亚海平面气压偏强,寒潮活动偏多,湖南冬季雨凇日数偏多;反之,湖南冬季雨凇日数偏少。

关键词: 太平洋海温, 湖南雨凇, 物理机制

Abstract: Based on the glazedata collected at 89 meteorological observational stations in Hunan, NCEP/NCAR reanalysis data, monthly mean sea surface temperature data from Hadley Centre from 1961 to 2018,the influence of Pacific SST anomaly in the early stage on winter glaze in Hunan province were analyzed. The results showed that,there was a significant positive correlation between the distribution of positive and negative dipoles in the Pacific SST in the early July-September period and the number of winter glaze days in Hunan. When the SST index is on the high side, the westerly jet to the north of the Yangtze River at 200 hPa in the late winter was stronger, the geopotential height near the Ural Mountain at 500 hPa was higher, the geopotential height at the middle and high latitudes in East Asia was lower, the sea level pressure in Siberia was stronger, the cold wave activity was more, and the number of glaze days in winter in Hunan was more; on the contrary, the number of glaze days in winter in Hunan was less.

Key words: Pacific SST, glaze in Hunan, physical mechanism

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