2001年1月滇黔准静止锋在演变过程中的结构及大气环流特征分析
ANALYSIS OF ATMOSPHERIC CIRCULATION AND STRUCTURE OF YUNNAN-GUIZHOU QUASI-STATIONARY FRONT DURING ITS EVOLUTION
-
摘要: 利用地面常规观测资料和NCEP/NCAR再分析资料,分析2001年1月的滇黔准静止锋在演变过程中的温湿结构和大气环流特征。结果表明:滇黔准静止锋表现为湿度锋,其大气环流特征与高原关系密切。青藏高原的抬升作用与Hadley环流偏南导致Ferrel环流的生成、加强对云贵高原的天气有重大的影响。对于Ⅰ、Ⅱ型静止锋,Hadley环流圈南北跨距小,环流圈下沉支偏南,易与高原南部的上升支一起形成反环流,该反环流可产生较强的雨雪、凝冻的灾害性天气;Ⅲ、Ⅳ型静止锋,Hadley环流圈北推,环流圈南北跨距大,此时在青藏高原的南部无反环流存在,云贵地区上升运动较弱,产生的降水与天气也较弱。由于受副高增强的间接影响,Hadley环流在Ⅱ、Ⅲ、Ⅳ型静止锋存在明显的双层结构。Abstract: Based on general ground observation data and NCEP data,the atmospheric circulation and the structure of Dian-Qian Quasi-stationary Front (named as DQQSF,same hereafter) during Jan. 2001 are studied. The results show that the DQQSF is a front of humidity and its circulation features are highly related to Tibetan Plateau. The weather of Yunnan-Guizhou Plateau is greatly impacted by the emergence of the Ferrel cell,which is resulted from the lifting effect of Tibetan Plateau and the southward anomaly of the Hadley cell. Corresponding to Pattern Ⅰ and Ⅱ Quasi-Stationary Front,the north-south distance of Hadley cell is short and its sinking branch is southward,which helps form counter-circulation with its rising branch at the south plateau. It is the counter -circulation that result in the severe weather such as snow,ice rain etc. In contrast,the Ⅲ and Ⅳ pattern Quasi-Stationary Front occurs with the north Hadley cell with longer north-south distance,and there is no counter-circulation over the south Tibetan plateau. Because of the indirect influence of the strengthening subtropical anticyclone,the Hadley cell shows a two-layer structure corresponding to the quasi-stationary front in Pattern Ⅱ,Ⅲ and Ⅳ.
-
Key words:
- Dian-Qian Quasi-stationary Front /
- Tibetan Plateau /
- Hadley cell /
- Ferrel cell /
- two-layer structure
-
[1] 叶笃正,高由禧.青藏高原气象学[M].北京:科学出版社,1979:39-40;49-61;202-212. [2] 叶笃正,罗四维,朱抱真.西藏高原及其附近的流场结构和对流层大气的热量平衡[J].气象学报,1957,28(2):108-121. [3] 钱正安,吴统文,梁潇云,等.高原及周围地区的平均垂直环流特征[J].大气科学,2001,25(4):444-454. [4] 秦剑,琚建华,解明恩,等.低纬高原天气气候[M].北京:气象出版社,1997:63-66. [5] 段旭,李英,孙晓东.昆明准静止锋结构[J].高原气象,2002,21(2):205-209. [6] 李英,段旭,潘里娜.昆明准静止锋的准地转Q矢量分析[J].气象,25(8):6-10. [7] 李英.条件性对称不稳定与昆明准静止锋风雹[J].热带气象学报,1999,15(3):273-279. [8] 陆痒.对云贵静止锋的一些看法[J].气象,1982,3(1):43-45. [9] 朱乾根,杨松.青藏高原大地形对冷涌作用的数值模拟研究[J].气象学报,1990,2(2):162-171. [10] 岳阳,管兆勇,王盘兴.两种再分析资料间Hadley环流双层结构的差异[J].南京气象学院学报,2005,28(5):695-703. [11] LORENZ E N.The nature and theory of the general circulation of the atmosphere[M].Geneva:WMO,1967(218):43-81.
点击查看大图
计量
- 文章访问数: 964
- HTML全文浏览量: 6
- PDF下载量: 613
- 被引次数: 0