ENGLISH

METEOROLOGICAL CHARACTERISTICS DURING THE SECOND MEIYU EPISODE IN 1998

Source:

    ZHANG Yan （张雁）， MA Qiang（马强）

        National Meteorological Center, Beijing 100081, China

        and KATO Kuranoshin(加藤内藏进)

        Okayama University，Japan

        Received March 15, 2002; revised May 20, 2002

        ABSTRACT

        This article examined the meteorological features of the second Meiyu/Baiu episode (hereafter Meiyu II) in 1998 and the results are summarized as follows: (1) The Meiyu II period in 1998 has been the longest and the most delayed ending one since 1885, which caused the great flood around the Yangtze River Basin. The circulation situation in Meiyu II is so typical that the average geopotential height and wind fields at 500 hPa and 850 hPa are very similar to monthly mean in June. The abnormal circulation in Meiyu II is associated with an adjusting of the Okhotsk high and short period southnorth oscillation of the subtropical high. (2) The heavy rainfall around the Yangtze River during Meiyu II period is closely related to a persistent shear line, a clear eastward moving vortex structure and a very strong jet flow at lower levels. It is very clear that the strong divergence at higher levels and convergence at lower levels occurred in situ during Meiyu II period.(3) It is very clear that the convective activity propagates eastward quickly with a period about 7 days during Meiyu II period.

        Key words: second Meiyu episode, circulation feature, large scale system

        Editor-in-Chief: Zhou Xiuji (周秀骥)

        EDITORIAL COMMITTEE OF AMS

        Chairman

        Zhou Xiuji (周秀骥): CAMS

        ViceChairmen

        Ding Yihui (丁一汇): National Climate Center, Beijing 100081, China

        Ji Liren (纪立人)： IAP CAS

        Wang Shaowu (王绍武): DG PU Standing Members et al. 31 altogather.

        此外还聘请了一些国际知名的大气科学家为国外编委。

        Foreign Members

        Anthes, Richard A.: UCAR, Boulder, CO 80307 3000, USA

        Chameides, William L.: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332 0340, USA

        Lau, William K. M.: NASA, Goddard Space Flight Center, Mail Code 913, Greenbelt, MD 20771, USA

        Liu Shaw C.: Aeronomy Laboratory NOAA/ERL, 325 Broadway, Boulder, CO 80303 3328, USA

        Longhetto, A.: Consiglio Nazionale delle Ricerche Istituto di Cosmo Geofisica, 10133 Torino, Italy

        Serafin, Robert J.: NCAR, Boulder, CO80307-3000, USA

        Tanaka, M.: Upper NCAR,　Boulder, CO 803073000, USA Atmosphere Research Laboratory, Faculty of Science Tohoku University, Sendai, Japan

        Wang Bin: Department of Meteorology, University of Hawaii at Manoa, Honolulu, HI 96822 USA

        Wang Wei-Chyung: Atmospheric Sciences Research Center, State University of New York at Albany, 100 Fuller Road, Albany, NY 12205, USA

        Yasunari T.: Institute of Geoscience, University of Tsukuba, Ibaraki 305, Japan

        Zhang Da-Lin: Dept. of Meteorology 2423 computer& Space Science Bldg Univ. of Maryland College Park, Maryland, 20742-2425, USA

        According to the statistics of nearly thousand of articles published in the past volumes, the percentage of every division of atmospheric sciences can be listed as follows:

        Synoptic Meteorology， 27%

        Analysis of Weather systems，Atmospheric circulation, monsoon and LFO， Tropical meteorology， Typhoon ， Tibetan plateau & polar meteorology， Satellite & Radar meteorology

        Climatology，22%

        Climatological statistics， ENSO & Air-Sea Interation and Climatic Teleconnection， Physical climatology & climate modeling ， Climate change & historical climatology，

        Dynamics & Thermodynamics of the Atmosphere， 18%

        Thermodynamics of the Atmosphere，Dynamics of the Atmosphere，Atmospheric nonlinear dynamics， Atmospheric waves

        Atmospheric Physics，15%

        Atmospheric probing & Equipment， Boundary layer meteorology，Cloud & precipitation physics，Radiation，Atmospheric electricity

        Weather Forecasting & Modification，10%

        Atmospheric modeling，General method & application of NWP，Atmospheric experiment， Weather forecasting using synoptic method, & statistical forecasting， Weather modification

        Atmospheric Chemistry，5%

        Applied Meteorology，3%

        Agricultural meteorology， Marine meteorology

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