干旱气象 ›› 2019, Vol. 37 ›› Issue (5): 736-746.DOI: 10.11755/j.issn.1006-7639(2019)-05-0736

• 论文 • 上一篇    下一篇

南亚高压的水平和垂直结构及其变化特征

吴辉1,2,雒佳丽2,纪海宇2,王丽娟3,田红瑛2   

  1. 1.中国人民解放军95994部队,甘肃酒泉735000;
    2.兰州大学大气科学学院,半干旱气候变化教育部重点实验室,甘肃兰州730000;
    3.中国气象局兰州干旱气象研究所,甘肃兰州730020
  • 出版日期:2019-10-31 发布日期:2019-11-04
  • 通讯作者: 雒佳丽(1987— ),女,甘肃天水人,博士,讲师,研究方向为平流层-对流层相互作用.E-mail: luojl@lzu.edu.cn。
  • 作者简介:吴辉(1995— ),男,甘肃酒泉人,助理工程师,研究方向为短期天气预报.E-mail: wuh14@lzu.edu.cn。
  • 基金资助:
    国家自然科学基金项目(41705021)和兰州大学中央高校基本科研业务费(lzujbky-2018-48、lzujbky-2017-it16)共同资助

Horizontal and Vertical Structure of the South Asia High and Their Variation Characteristics

WU Hui1,2, LUO Jiali2, JI Haiyu2, WANG Lijuan3, TIAN Hongying2   

  1. 1. The 95994 Troop of PlA, Jiuquan 735000, Gansu, China;
    2. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
    3. Institute of Arid Meteorology, CMA, Lanzhou 730020, China
  • Online:2019-10-31 Published:2019-11-04

摘要: 利用1948—2016年NCEP/NCAR月平均再分析资料,对南亚高压的水平与垂直结构、中心强度、位置及多年变化特征进行分析。结果表明:与多年平均相比,在上对流层下平流层区域(70、100、150、200 hPa),不同典型异常年份南亚高压的水平结构表现出双中心、纬向与经向跨度变大的特征,但不同高度其水平范围变化不同。近69 a对南亚高压内部空气束缚的东风急流最大风速整体呈减弱趋势,而西风急流的最大风速则无明显变化趋势。南亚高压的热力和动力垂直结构在不同年份有所不同,即东、西风急流强度和温度异常存在年际差异。1948—2016年南亚高压的厚度有明显的年际变化,大致为6.32~6.42 km。各高度南亚高压中心位势高度值在1975—1980年间均上升了0.1 gpkm左右,且中心位置存在东西振荡和南北位移,但这种变化幅度存在一定差异。

关键词: 南亚高压, 上对流层下平流层, 水平与垂直结构, 多年变化特征

Abstract: Based on monthly average reanalysis data from NCEP/NCAR from 1948 to 2016, the horizontal and vertical structure of the South Asia high (SAH) and their long-term variation characteristics were investigated. The results show that the horizontal structure of the SAH on 70 hPa, 100 hPa, 150 hPa and 200 hPa in different typical anomaly years appeared double centers mode and zonal and meridional enlargement, compared with the climatology state, but the horizontal width change of the SAH on different levels was different. The maximum wind speed of easterly jet constrained by internal air of the SAH weakened from 1948 to 2016 as a whole, while that of westerly jet had no significant change tendency. The dynamic and thermal vertical structures of the SAH including easterly jet, westerly jet, and air temperature anomaly were different during 1948-2016. The thickness of the SAH had obvious annual change, and it varied from 6.32 km to 6.42 km in the past 69 years. The geopotential height values of the SAH center on different levels rose about 0.1 gpkm during 1975-1980, and the east-west oscillation and south-north displacement of the central location were obvious, but the change ranges were different on different levels.

Key words: South Asia high, UTLS, horizontal and vertical structure, long-term variation characteristics

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