ISSN 1000-0526
CN 11-2282/P

Volume 19,Issue 5,1993 Table of Contents

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  • 1  Review on the Techniques for Estimation of Precipitation with Satellite Data
    1993, 19(5):3-8. DOI: 10.7519/j.issn.1000-0526.1993.5.001
    [Abstract](811) [HTML](0) [PDF 211.02 K](472)
    The widely used techniques for estimation of precipitation with satellite data are comprehensively presented. Some data in the published papers are used to analyse and compare these techniques. The problems in solving precipitation estimation are discussion.
    2  An Analysis on the Causes of the Typical Drought/Flood over the Valleys of the Yellow and theChangjiang Rivers during the Last Decades
    李月洪 刘永强
    1993, 19(5):9-15. DOI: 10.7519/j.issn.1000-0526.1993.05.002
    [Abstract](360) [HTML](0) [PDF 204.55 K](481)
    Based on the ECMWF data in summers of 1983,1986 and 1991,authors diagnostically analyze the features and physical causes of drought events over North China and flood events over the mid-low reaches of the Changjiang River. The results show that two patterns of the potential verticity field exist. One can be called "the blocking pattern"(1986),the other is "cold vortex pattern "(1983 and 1991). In addition,it is obvious that the features of water vapor transport and apparent heat sources of atmosphere vary during the different drought/flood periods.
    3  A Non-Parameter Test of the Twice Artificial Precipitations by Air-craft
    宋润田 刘力威
    1993, 19(5):16-19. DOI: 10.7519/j.issn.1000-0526.1993.05.003
    [Abstract](551) [HTML](0) [PDF 107.18 K](490)
    In order to understand the effect of the twice artificial precipitations by air-craft in 1990,the non-parameter techniques by W-M-W(Wilcoxon-Marn-Whitney)and Wilcoxon are used. The results show that the rainfalls vary in great amount between the plume area and non-plume area in 3 hours since operating. And the significant variations are also found in the plume area between 3 hours after and 3 hours before operating. Therefore,it is easy to understand that artificial seeding brings out the significant increment of rainfall. The rainfall inhencement are estimated quantitatively.
    4  Test on the Ice Nucleation of Liquid Nitrogen in a Small Cloud Chamber
    王美玲 任婕 韩光 曹学成 俞香仁 姚扬苑 黄世鸿 李如祥
    1993, 19(5):20-22. DOI: 10.7519/j.issn.1000-0526.1993.05.004
    [Abstract](573) [HTML](0) [PDF 100.67 K](528)
    The number of ice crystals generated from lg liquid Nitrogen was determined in a cloud chamber. The average is 1012. g-1. It is nothing with air temperature that liquid Nitrogen can generate ice crystals.
    5  Test and Evaluation of Physical Performance of OTC-1 Open Top Ghamber
    王春乙 高素华 潘亚茹 白月明 温民 刘江歌
    1993, 19(5):23-26. DOI: 10.7519/j.issn.1000-0526.1993.05.005
    [Abstract](532) [HTML](0) [PDF 121.08 K](500)
    The physical performance of OTC-1 open top chamber is evaluated. The results show that the control of the input CO2 is stable and the horizontal and vertical distribution of CO2 density in the chamber is homogeneous when CO2 density is different. With the conditions of ventilation and nonventilation, the distributions of temperature and humidity in the chamber are basically similar. And the C-filter is working efficiently.
    6  The Efficiency of T42 NWP Products and Synoptic Analysis in China
    张芬馥 刘国强
    1993, 19(5):27-33. DOI: 10.7519/j.issn.1000-0526.1993.5.006
    [Abstract](502) [HTML](0) [PDF 254.25 K](489)
    In order to understand the performance of T42 NWP and the efficiency of its products,the comprehensive analysis is made on the parameters obtained case studies of T42 prediction products in 1992. Meanwhile, the investigations on the evolution of the large-scale circulation and its adjustment are taken and the significant weather processes are taken into account. The results show that the 96-hour and 120-hour forecasts by T42 model are reasonably reliable for the motions of the atmospheric long wave and extra-long waves. They are considered to be valuable for the medium-range forecasting of the tendency and trend related to the evolution of the large-scale circulation. The model is better working in forecasting of the westerly belt circulation than in prediction of the subtropical circulation. However,the significant distortion appears when the model is used for forecasting of the southern frontal area and its formation and extinction. This is the key point when the model is improved.
    7  On the Background Situation and Midium-RangeForecasting of the Explosively Developing Cyclonesover the Temperate Zone
    李晓东 马德贞
    1993, 19(5):34-38. DOI: 10.7519/j.issn.1000-0526.1993.5.007
    [Abstract](747) [HTML](0) [PDF 179.12 K](507)
    Based on the analysis of the Features with the physical quantities of the relative parameters 5 days before the explosive development of the cyclones over the Northwest Pacific in winters during 1975-1988,it is found out that the locations of the explosive cyclones are related with the disposal of the ultra-long wave,long wave and the location of the westerly jet center in the middle-up troposphere. The studies lay a solid foundation to improve the medium-range forecasting. The forecasting rangs can be extented longer with NWP products.
    8  Temporal and Spatial Characteristics of Summer Monsoon Rainfall in China in 1991
    1993, 19(5):39-44. DOI: 10.7519/j.issn.1000-0526.1993.5.008
    [Abstract](498) [HTML](0) [PDF 211.53 K](537)
    The temporal and spatial characteristics of the onset of the summer monsoon rainfall and the shift of the rain belt over East China is analysed based on the dekad rainfall data at 41 stations from April to September in 1991. The distribution patterns of the summer monsoon rainfall arediscussed using empirical orthogonal function (EOF) and its 20 to 30 day'low-frequency variability is also discussed. The difference between the rainfall distribution patterns in flood years and that in drought years in the Jianghuai area is considered tentatively.
    9  Application of Meteorological Satellite Remote-Sensings to Investigation of the Sea Temperature Resources
    韩玺山 袁国恩 赵彦
    1993, 19(5):45-49. DOI: 10.7519/j.issn.1000-0526.1993.05.009
    [Abstract](687) [HTML](0) [PDF 184.57 K](480)
    The meteorological satellite data of sea surface temperatrue are handled with computer. The three-dimensional distribution of the sea temperature is plotted. The law of the movements of cold and warm water masses which affect the aquatic products industry in Changhai County are found out. The masses are classified, which is considered as the important scientific reference to the aquatic products industry.
    10  Studies on the Forecast of Crop Yield with Compound Factors in Heilongjiang Province
    矫江 王俊河 高耀辉 任鹏
    1993, 19(5):50-52. DOI: 10.7519/j.issn.1000-0526.1993.05.010
    [Abstract](498) [HTML](0) [PDF 108.85 K](453)
    The meteorological data are accumulated and compounded to "heat index, drought index and water-logging index ", which can represent the calastrophic meteorology in Heilongjiang Province. In this case,the effects of the chilly injury,drought and water-logging damage are considered for the crop yield forecast. The indices can be used to eliminate the average error calculated from the multi-point meteorological data and increase the efficiency of the meteorological data. The test in 1990 (a pumper year)and 1991 (a heavy water-logging year)show 2. 62%. In July and August 1991,an error at a rate of the crop yield was predicted two and three morths ahead respectively, the average accuracy was above 95%.

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