Abstract:Index and process of impact of fog on highway communication were studied,an assessment model of impact of fog on highway communication was made using a lot of highway communication accidents caused by fogs.

Abstract:Based on the definition of rare events to be given and the assessment of the successful parameters forecasting rare events,an equation by parament transformation was suggested.It can be seen that a method to improve the forecast accuracy of rare events is to turn the rare eveuts from very little probability into large probability by conditional probability.

Abstract:Penman formula was used to calculate the evapotranspiration in the upper valley of the Huanghe river since 1980.The variation tendency of some climatic factors,such as evapotranspiration,sunshine duration,air temperature,air saturation deficit and etc,were analysed.The dry climate impact on the evapotranspiration in the area was focused in the study.The results show that the evapotranspiration is increasing annually with the speed of 3.25 mm in the area;while the sunshine duration which is considered as main impact factor,is increasing with 3.6 hour/year;air temperature is appearing the increasing tendency,and its climatic tendency is 0.4℃/10 years;air saturation deficit is increasing with 0.02/year.Therefore,It is suggested that the evapotranspiration is greatly increasing as increment of sunshine duration,air temperature and air saturation deficit in the area.But the increment of evapotranspiration and decrement of precipitation amount impact directly on the decrement of flow curve and expanding of grassland′s desertization in the upper valley of the Huanghe river.

Abstract:There is a good correlation between snow cover of the Qingzang Plateau in winter and the summer rainfall in China,especially in the Changjiang River valley.The inundation of the Changjiang River valley in 1998 was closely related the anomaly snow cover of the Plateau in winter,and the situation was a reflection of 500hPa mean height field in spring and summer.But its correlation effected by the interannual and decadal variation of 500hPa mean height field is complicated.

Abstract:Based on the comparison and analyses of large flood in the Changjiang River valley in 10 years since 1951,the results of assessment of the rainfall in the Changjiang River valley in 1998 show that flood in 1998 is similar to that in 1954,the summer rainfall in the Changjiang River valley in 1998 similar to that in 1954,and more than other flood years.

Abstract:After analyzing the macro-scale circulation characteristics favourable to the storm rainfall in the Nenjiang-Songhuajiang River basin during 1998 flood period,It′s found that the East Asia blocking high is persistently strong and has a westward position.A longwave pressure ridge maintains between Ural and West Siberian region,and the West Pacific subtropical high and the East Asia blocking high superimpose each other in 130°E.The stable northeast cold vortex is a main reason leading to the storm rainfall in the Nenjiang river and the Songhuajiang river basin in 1998 summer.

Abstract:By using of the ocean temperature data in the North Pacific,and temperature and precipitation data in China from 1951 to 1998,the relationship of the air temperature and precipitation in China and the ocean temperature at four seasons in the Equatorial East Pacific,El Nino and La Nina event were analysed.The results show that there is a certain relationship among these factors,the temperature in winter is better relation to the ocean temperature,and the precipitation in autumn is the best relation to the ocean temperature among other three seasons.

Abstract:By using of the TBB data of 16 cases during 1981-1991,the influence of Bengal Bay depression on the heavy rainfall in Yunnan province was analysed.The isotherm,temperature gradient of cloud top,and the effectiveness of cloud precipitation were calculated.The structure and cloud images of the mesoscale convective system causing heavy rainfall were also analysed.The relationship of the cloud image characters of the depression and heavy rainfall in Yunnan was described.

Abstract:Using the data of monthly precipitation in China,sea surface temperatures and the general circulation indexes,the general circulation feature,climate background and SST influence were studied.It′s shown that:there is an apparent teleconnection between the general circulation indexes and SST field in the Pacific; the variation of the Pacific SST in winter and spring is able to predict precipitation tread in South China in next summer.Floods in South China were formed in this kind of circulation background,the early change of SST and feature of general circulation have an indication to precipitation forecast in South China.

Abstract:The developed method of the meteorological database managment system was introduced.The prevalent visual designed tool visual Foxpro 5.0 as the programming language was selected to realize the function of database building,query,modification,copy,join and transformation of the meteorological database.

Abstract:On the basis of geometric rectification theory of digital image,a simple correcting arithmetic is introduced for most typical distortion of satellitic image.Theoretically,the arithmetic has an error less than one-pixel,which is accurate enough for routine calibration.

Abstract:The stepwise regression method was used to analysis the sunshine duration,the latitude longitude and sea level elevation of 20 weather stations in the Tarim basin during 36 years from 1961 to 1996.A calculating model of annual sunshine duration along the Tarim oil gas pipeline was given.Annual sunshine duration with different probabilities at the solar energy power stations of the middle station of the pipeline was estimated in terms of the extreme distribution probability model,and the distribution feature of annual sunshine duration in the Tarim basin was described.The extremes of annual sunshine duration once every 30,50 and 100 years were referred to as the designed value in the project of solar energy power station.These values are of importance in the development of the oil gas resources at the Tarim oilfield.

Abstract:Based on the data of beginning time and final severity ration of winter wheat powdery mildew,synchronous meteorological factors of representative stations in Jiangsu province in recent affect 10 years,the characteristic of influence of meteorological condition on winter wheat powdery mildew was studied in terms of sliding correlation analysis.It was found that meteorological conditions affect notably the beginning time and final situation of winter wheat powdery mildew,but the influence varies in different phase and region.Based on the conclusion given abov,the prediction model of winter wheat powdery mildew was developed.

Abstract:The design,structure and function of integrating management system for meteorological data demanded by the national project of Huanan Area Meso scale Experiment (HUAMEX) was introduced.The meteorolgical data in different sources and format can be managed in the integrating system.