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This article investigates in detail the structure, genesis and development of parallel-type warm sector rainbands from radar observations. By comparing these observations with diagnostic results from temperature, pressure, moisture and wind data, which are both actually observed and numerically generated by a mesoscale model, and the theory of symmetric instability, it is found that the conditional symmetric instability might be responsible for the formation and development of these rainbands. 相似文献
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第二届中美中尺度气象会议于1990年9月19—21日在美国科罗拉多州博尔德市召开。国家气象局、中科院大气所、北京大学、南京大学、上海市气象局和湖北省气象局共12名代表与会。该研讨会按中美大气科学技术协议每两年召开一次,在两国交替举行,它的首届会议于1988年9月5—7日在北京举行,美方以当时的 NCAR 主任 Anthes 为团长的12人代表团参加了首届会议,成员也是来自NCAR、NOAA 和一些大学。会议主要有两个任务:相互交流中尺度气象研究、应用、业务方面的最新成果;回 相似文献
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中尺度业务预报试验数值模式系统 总被引:8,自引:5,他引:8
以引进的美国Penn State/NCAR中尺度模式(MM2和MM4)为基础,按照实时业务预报需要和我国资料特点,在PC/386微机上研制了中尺度业务预报试验数值模式系统。在1989—1990年进行的实时业务预报试验中,该系统运行稳定,预报时效能满足实时业务预报要求,预报结果对12—24小时短期天气预报具有参考价值,适合于省(市)级气象台站等业务单位使用。 相似文献
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This study is essentially an experiment on the control experiment in the August 1975 catastrophe which was the heaviest rainfall in mainland China with a maximum 24-h rainfall of 1060.3 mm, and it significantly demonstrates that the limited area model can still skillfully give reasonable results even only the conventional data are available. For such a heavy rainfall event, a grid length of 90 km is too large while 45 km seems acceptable. Under these two grid sizes, the cumulus parameterization scheme is evidently superior to the explicit scheme since it restricts instabilities such as CISK to limited extent. The high resolution scheme for the boundary treatment does not improve forecasts significantly.The experiments also revealed some interesting phenomena such as the forecast rainfall being too small while affecting synoptic system so deep as compared with observations. Another example is the severe deformation of synoptic systems both in initial conditions and forecast fields in the presence of comp 相似文献
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中尺度数值模式中初始场和地形的不同处理对降水预报的影响及相对比较 总被引:4,自引:0,他引:4
与天气尺度系统相比,中尺度天气系统的风场较重要,散度场和降水量有很好的相关性。那么在中尺度模式的初始资料处理中是否能延用天气尺度模式的处理方法,如风场的无辐散处理等。另一方面,中尺度系统中强迫过程如地形的作用也很重要。这两方面分别有过不少研究[1,2],但对某一地区,特别是地形复杂的地方,弄清中尺度数值模拟是对初始场还是对地形处理敏感,将有助于中尺度模式的研究改进和地形作用的探讨。 相似文献
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