ISSN 1000-0526
CN 11-2282/P

Volume 25,Issue 7,1999 Table of Contents

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  • 1  Simulation Study of Taihang Mountain Terrain Effects on Heavy Rain in August 1996
    徐国强 胡欣 苏华
    1999, 25(7):3-7. DOI: 10.7519/j.issn.1000-0526.1999.7.001
    [Abstract](734) [HTML](0) [PDF 332.05 K](703)
    With application of four designed simulation schemes,effects of the Taihang mountain terrain on heavy rain in August 1996 was explored by MM4 model,and the mechanism of the increasing precipitation in terms of some elements such as perpendicular motion,vaporflux etc.was discussed.The results show that the terrain affects obviously the intensity and location of precipitation cell,increases rainfall by 60%,and favors the upward current and vapor convergence.It is proved that the closer active terrain is,the better the model forecast will be and the higher terrain is,the more obvious precipitation enhancement effect will be.
    2  The Numerical Simulation Experiments of the Jets Effects on Torrential Rain over the Southern Haihe River Basin during August 1996
    胡欣 徐国强 苏华
    1999, 25(7):8-11. DOI: 10.7519/j.issn.1000-0526.1999.7.002
    [Abstract](576) [HTML](0) [PDF 310.83 K](705)
    By means of MM4 model,the process of torrential rain over the southern Haihe River Basin during August 1996 was simulated.Through compared tests,the changes of precipitation and elements were studied after low-and high-level jets were weakened.The results demonstrate that the jets are favorable to the torrential rain occurrence and maintenance,the lowlevel jet has more important effects on the rain compared with that of the high-level jet.
    3  The Heavy Rain′s Vapor Sources and Vapor Sensitivity Simulation in August 1996
    徐国强 张迎新
    1999, 25(7):12-16. DOI: 10.7519/j.issn.1000-0526.1999.07.003
    [Abstract](723) [HTML](0) [PDF 344.56 K](607)
    The vapor sources of the heavy rain during August 1996 in terms of real data was studied.The result points out that the vapor of the torrential rain comes from the South China Sea and the Bay of Bengal as well as typhoon-low itself carrying moisture.Finally,the heavy rain sensitivity to vapor by virtue of MM4 model was analysed.It is suggested that a little variety of vapors can bring large change of rainfall and latent heat releasing has positive feedback effects to heavy rain.
    4  The Weak Cold Air Influence upon Heavy Rain in August 1996 and Its Simulation
    徐国强 胡欣
    1999, 25(7):17-20. DOI: 10.7519/j.issn.1000-0526.1999.7.004
    [Abstract](725) [HTML](0) [PDF 258.74 K](624)
    The stream field and thermohyet field of heavy rain in August 1996 were analysed and the low-level weak cold air influence on the heavy rain by means of MM4 model was studied.The results indicate that the weak cold air has noticeable effects on the falling area and intensity of the torrential rain.It is favorable to low-level convergence and upward current as well as vapor and energy accumulation in Hebei province.
    5  Structural Characteristics of Very Heavy Rain Occurring in the Periphery of a Typhoon
    李云川 张杏敏 周须文
    1999, 25(7):21-24. DOI: 10.7519/j.issn.1000-0526.1999.07.005
    [Abstract](490) [HTML](0) [PDF 1.27 M](618)
    The distribution characteristics of satellite picture,radar echo,surface wind field and θse field were analyzed in order to in vestigate the very heavy rain occurred in the southwest of Hebei province in August 3~5,1996.The results show that meso-β and mesoγ cloud clusters in meso-αare able to result in not only the precipitation enchancing but also the bursting of severe precipitation.In addition,the wet neutral structure is beneficial to the emerging and strengthening of very heavy rain.
    6  Analysis on Mesoscale Systems of the Torrential Rain August 1996
    杜青文 任荣彩 康锡言
    1999, 25(7):25-28. DOI: 10.7519/j.issn.1000-0526.1999.7.006
    [Abstract](852) [HTML](0) [PDF 349.44 K](610)
    After diagnosing the operational meteorological data, the satellite cloud pictures, and the intensive surface observational data, it was found that there were six surface mesoscale rain clusters (1 hr rainfall≥10mm, life cycle≥3hr) formed in succession in the two meso-a cloud clusters causing the torrential rain in Hebei in August 1996. And, associated with the clusters, there were several surface mesoscale systems closely related to the surface moist baroclinic front and the surface convergency in their development.
    7  A Routine Flow of Short-range Weather Forecast in Ningxia
    吴岩峻 胡文东 丁永红 丁建军
    1999, 25(7):29-33. DOI: 10.7519/j.issn.1000-0526.1999.07.007
    [Abstract](506) [HTML](0) [PDF 353.07 K](579)
    An operational routine flow of Ningxia short-time weather forecast was introduced, which is based on Project 9210 and guided by the Ningxia MOS guidance. Combined with the local meteorological operational situation, this automatic flow has set the forecastors free from the traditional paper-operation with computer-operation, and the automatic level of forecast is greatly improved.
    8  A Brief Introduction to Artificial Precipitation Enhancement Techniques in Beijing
    1999, 25(7):34-36. DOI: 10.7519/j.issn.1000-0526.1999.7.008
    [Abstract](523) [HTML](0) [PDF 186.39 K](625)
    The status quo of water resource shortage and general climate situation were analysed.The necessity and technique feasibility of artificial precipitation enhancement were discussed.With different means of delivery,such as aircraft,balloon,artillery and rocket,an introduction to achievements in science research on seeding agent,selection of operating opportunity,operation method,effect test and numerical simulation were also given.
    9  Forecasting Method for Hail in Middle and Western Inner Mongolia
    李一平 薄玉华 金恒泰
    1999, 25(7):37-40. DOI: 10.7519/j.issn.1000-0526.1999.07.009
    [Abstract](474) [HTML](0) [PDF 265.39 K](587)
    First,from the viewpoint of atmospheric energetics,several factors and dynamical condition favourable to the hail genesis were described.Then,after conducting 84 case studies to the precipitation with hail occurred between 1980 and 1987,some forecasting indexes were obtained.These indexes were proved to be effective in the routine weather prediction.
    10  The Forecast of Dekad Temperature Abnormal of China in Winter
    李月安 金荣花 林玉成
    1999, 25(7):41-45. DOI: 10.7519/j.issn.1000-0526.1999.07.010
    [Abstract](605) [HTML](0) [PDF 310.54 K](634)
    The routine meteorological fields were expanded by use Chebyshev Polynomials.The coefficients of them could represent the main characteristics of meteorological fields.Using them as factors,the forecast equations for dekad temperature abnormal of China in winter were established.The result indicated that this method was useful to the forecast of temperature abnormal.On the other hand,the relativity between each level data and temperature was discussed.
    11  Recognition of Formation and Development of Mesocyclone Squall Storm by Radar Data
    1999, 25(7):46-51. DOI: 10.7519/j.issn.1000-0526.1999.7.011
    [Abstract](633) [HTML](0) [PDF 346.61 K](686)
    The development of the mesocyclone squall storm in Beijing region on June 9,1998 was observed and analysed in detail by using the Chinamade 3824cband single Doppler weather radar,and the storm recognition and its formation process were also studied.
    12  Analysis of the Mechanism of a Heavy Fog in Henan Province
    夏立新 黄石璞
    1999, 25(7):52-56. DOI: 10.7519/j.issn.1000-0526.1999.7.012
    [Abstract](944) [HTML](0) [PDF 329.17 K](788)
    The mechanism of a heavy fog which result serious problems in winter 1997 Henan province was analysed.It concludes that if the water vapor condition and weather tendency condition are satisfied,continuous heavy fog could be formed by radiation effect.The continuous reconstruction of the conversion and the sufficient water vapor from LBL are necessary for the heavy fog's formation and maintenance.

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