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PLATEAU METEOROLOGY  1993, Vol. 12 Issue (1): 56-66    DOI:
    
SYNOPTICAL AND CLIMATOLOGICAL ANALYSIS OF THE CYCLONE AND ANTICYCLONE IN THE LOWER ATMOSPHERE OVER THE EAST ASIAN CONTINENT IN JANUARY AND JUNE
Xu Baoyu, Luo Siwei
Lanzhou Institute of Plateau Atmospheric Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000
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Abstract  In this paper,we have analysed the synoptical and climatological feature of the cyclone and anticyclone on the sea-level,850 hPa and 700 hPa charts in the Eurasian continent in January,April,July and October of 1976-1985.The main results are:(1) Except for Qinghai-Xizhang Plateau,the lee cyclogenesis and the windward anticyclogenesis over the Asian mountains are the same as the general rule.(2) There are five frequent centers of the low pressure whose main features are that from sea level to 700 hPa their frequencies increase rapidly.The frequent center for the west of the Qinghai-Xizang Plateau corresponds to the cut off low in the upper atmosphere which always appears and the other four centers of weak low pressures are generated by local,which always move eastward and disappear rapidly.The southwest vortex over Sichuan Province is typical one of them,which appears rare at surface (sea level) but about once a day on 700 hPa.Its frequent center is large for all four seasons in which it is larger in spring and autumn and less in summer,but vortex is stronger in summer.(3) In January on the sea level cold high over the west mountains of the Mongolia is the strongest with the largest frequecy but on 850 hPa it decreases rapidly in intensity and frequency.The smaller scale anticyclone over the region of Shanxi,Gansu and Ningxia Provinces-northeast part of the Qinghai-Xizang Plateau is the strongest with maximum frequecy.The sea level elevation of these areas approach to 850 hPa and their analysed results should be more able to represent the real situation of the surface but the analysis on the sea level chart may make more mistake due to the correction from the surface to sea level,i.e.the intensity and frequency of the Mongolian High on the sea level may not be true enough and some mechanism of pressure increase may exist around Lanzhou-northeast part of the Qinghai-Xizang Plateau.
Key words:  The continent of East Asia      The distribution of the cyclone and anticy-clone in the lower atmosphere      The synoptical and climatological analysis     
Received:  26 September 1992      Published:  24 March 1993
Articles by authors
Xu Baoyu
Luo Siwei

Cite this article: 

Xu Baoyu, Luo Siwei. SYNOPTICAL AND CLIMATOLOGICAL ANALYSIS OF THE CYCLONE AND ANTICYCLONE IN THE LOWER ATMOSPHERE OVER THE EAST ASIAN CONTINENT IN JANUARY AND JUNE. PLATEAU METEOROLOGY, 1993, 12(1): 56-66.

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http://www.gyqx.ac.cn/EN/     OR     http://www.gyqx.ac.cn/EN/Y1993/V12/I1/56

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