Abstract:The circulational cause of heavy rainfall of Beijing on 19 August,2001 is given through diagnostic analysis.The results show that it is a typical large scale heavy rainfall which is related to the middle latitude baroclinic disturbance.The mechanism of the heavy rainfall could be revealed by the qusai-geostrophic theory.This study is a complement to the heavy rainfall research which was concentrated on mesocale convective system nowadays.

Abstract:″973″key project--China Heavy Rain Experiment and Study (CHeRES) used dual-Doppler radar to measure the heavy rain in the middle and lower reaches of Changjiang River in 2001,it is the very important to retrieve the three-dimensional wind fields using the radar volume scan data. A software system is developed that can retrieve the three-dimensional wind fields from the data measured by multiple-Doppler radar synchronously. The three-dimensional wind fields of a meso-β heavy rain measured by dual-Doppler radar on July 13th 2001 are retrieved and analyzed by using this software system. The results show that the wind field structure is resonable,and the system can meet the requirements of the experiment.

Abstract:The making an investigation of air pollution sources is a difficult thing for prediction of urban air quality. A new method is introduced into the inversion of air pollution point-source distribution. The direct relationship between concentration and source′s discharge can be established by this method. Data of TSP from EPA were used to simulation a case.

Abstract:The rainfall estimation technique based on the artificial neural network model is developed. Using the hourly GMS four channel′s data and rainfall records from hydrolgraphical station,the study of a heavy rain case which occurred in Huai River and Yangtze River basins (east of 108°E,from 24°to 36°N) shows that the average correlative coefficient between the quantitative precipitation estimation and the observation rainfall is 0.57,which is far higher than that in operation.

Abstract:The climatic distribution features of the monthly precipitation and the annual variation of the seasonal precipitation from 1951 to 2000 in the Northern Xinjiang are analyzed. And the obvious response of the precipitation of the rainy season (AMJJ) and the monthly precipitation in the Northern Xinjiang (average for 5 stations) to SST over the equatorial eastern Pacific and to southern oscillation index (SOI) are revealed emphatically.Furthermore,by using SST and SOI in the previous period as the predictors,the predictive equation of precipitation during the rainy season in the Northern Xinjiang is set up.The equation has the great application value for the long-range forecast of the rainy season precipitation in the region.

Abstract:The method of statistical analysis is Applied to discuss the relationship between activity of tropical cyclone affecting Guangxi and the early or late,intensity of tropical monsoon onset by using conventional tropical cyclone data and the recent results of south China Sea monsoon experiment research. And then some statistical features are revealed. The results show that not only the enhancement of summer monsoon would promote tropical cyclone genesis but also when the monsoon air rolls into the tropical cyclone it would play a positive role in the development of cyclone.

Abstract:Based on the observations by a CINRAD WSR-98D Doppler weather radar, and synoptic charts at 500hPa and 850hPa, satellite imagine, etc.,a case of heavy rain on November 2,2001 is analyzed. The results show that the cold/warm advection and the position of a cold front causing heavy rainfall can be determined and analyzed according to the run of zero velocity line, the movement of the heavy rainfall area can be determined according to wind fields.

Abstract:Based on collecting of meteorological cereal crop yield forecasting models and quantitative analysis of meteorological cereal crop yield affecting factors, the configuration of meteorological factors are classified according to the different areas by methods of clustering analysis. The primary and secondary meteorological factors affecting major cereal crop yields in different areas of China and their affecting periods are found and discussed thoroughly. The conclusions can be used for forecasting of the large-area cereal crop yields .

Abstract:Using the results calculated from the model output production of mesoscale model (MM5) the forecast of heavy fog on the high way in Shaanxi province is made.In the output productions, there are some elements,such as moisture,wind and thermal fields per hour,which a closely related with the formation of fog.Then,using the methods of PPI,MOM and MEC,the fog forecasts of 14 point on four expressway in Shaanxi province can be presented.It is shown that the forecast method is proved to be available.

Abstract:The probability forecasting method of quantifying, timing and locating of hail storms in Weihai city is developed with analog deviation and sounding data from January 1986 to December 1997 in Eurasia. According to numerical information composed four circulation patterns of Weihai hail storms, the recognizing circulation patterns of numerical forecast production is finished with analog deviation. A multiple probability forecasting of quantifty, timing and locating of hail storms is realized with HLAFS numerical forecasting production and multiple-stage analog method in Weihai city.

Abstract:Temperature abrupt changes and its decadal variation characteristics in Kezhou district, Xinjiang are discussed. A mean generating function model is used in the experiment of short-term climate prediction.The results show that this model can correctly simulate the climate trend in the period of 1995-2000, and it also has a good ability in the predication of seasonal and annual temperature variation.

Abstract:By investigating the processes of sending the meteorological data such as the radar through the ADSL broad-band to the internet,it is shown that it is practicable to transmit the meteorological information by using the communication method provided by ISP.