Abstract:Cloud micro-physical structures for mei-yu front rainfall were observed by using the balloon-borne Precipitation Particle Image Sensor during June and July 1999 at Shanghai.The observations including vertical distributions of various particle size,their number density and mass density are obtained.Analyses show that icecrystals,graupels,snowflakes and frozen droplets often coexist with the liquid phase in the convective cloud clusters inbanded in mei-yu front rainband.They and their interactions play important roles in the formation and evolution of rainfall.

Abstract:Using the data from 1994 to 1998 on both mandatory levels and significant levels at Kuerle station,two different methods are designed for calculating the past years′ atmospheric densities at a fixed altitude,which is at a distance of 500m ranging from surface to the most sea level elevation.The comparing analyses suggest that both results are very close.

Abstract:Fujian precipitation enhancement commanding system refers to a one-dimentional time dependent cumulus model of Hu ZhiJin.A research method of determining initial field of cumulus model in weather modification is discussed.Considering different weather type affecting model initial parameter,the method of determining sensitive parameter priority to other correlative parameter is developed synthetically.By classifying,it is proved that the model initial field is good correlative with weather type.It is obtaind that the precipitation forecast accuracy of model is greater than 75% and that is available to forecast cumulus height.It is also obtained that sensitive parameter (initial disturbance temperature) and mean surface maximum temperature are carrelative each other.

Abstract:A statistical relationship between daily electricity depletion and meteorological elements in Beijing city is established by using the real power consumption data and meteorology data during the Summer of 1998 and 1999. Statistical and forecasting equations of daily power consumption including the maximum, the minimum and the average value are achieved, respectively. The results show that the power consumption had a very close relationship to the weather condition, especially it is very sensitive to the temperature, and then to the relative humidity, wind, sunshine duration and as well as the precipitation.

Abstract:In recent 40 years the area of heat island in Shanghai city has extended 7～8 times and the intensity of heat island enhanced about one time. It results in the increase of hoting damage. The rapid extension and intensification of heat island in Shanghai since 1980′s are related well with the development of the city construction. It has become a problem urgently to be solved that how the city construction should be programmed rationally in order to reduce the influence of heat island and to keep Shanghai city healthy and sustainable development. The decreasing tendency of heat island effect in the central district in recent years indicates the importance of city greening.

Abstract:Based on the 46 days′observations of the temperature and humidity inside four different storey rooms in midsummer in 2000 in Wuhan, the changing rules of the temperature and humidity inside rooms are analysed, and the differences of the garret′s to the other storey′s and the facing-nouth room′s to the facing-north room′s are described, which are caused by various solar radiation receiving and so on. After that, the forcasting equations to the temperature and humidity in rooms are set up with multivariate linear regression.

Abstract:The concept of crop water requirements is discussed,based on which the calculation method of crop water requirements is established.Using the newest crop and meteorological data,the water requirement of spring crops in China is calculated,and its distributoin is discussed.The satisfied degree of water demands for spring corn is evaluated by using water correction factor.The results indicate that the climate is suitable to the production of spring corn,except in April,May and June,which is the time of planting,emergence and jointing for spring corn.Some measures such as relevant planting technology,saving irrigation and manual rainfall should be taken to alleviate the drought.

Abstract:Meteorological Information Comprehensive Analysis and Processing System (MICAPS) is a subsystem of project 9210 of CMA.It provides a basic working platform for operational weather forecasters.This system can be used to process and display almost all the meteological information.MICAPS system has two versions,one is for SGI workstation and another is for PC platform.The PC version has been used in weather forecast station of all levels (from province,district to county).In order to enlarge the application scope and facilitate the system installation,both Chinese version and English version of setup program have been developed.The main usage and some key techniques about the tool kit are discussed.

Abstract:Based on the results of field experiment, the analysis of water consumption during various growing phases in an arid year is made. The influences of different daily rainfall on distribution of soil water on three-meter profile are compared. The variation of soil layers in different depth in processes of soil water losing and its effect on accumulation of dry mass are discussed. The result could provide a foundation for management of soil water in the field of summer corn in arid year.

Abstract:Statistical methods are mainly applied to the analysis on the factors of the tropical cyclone itself, such as location, lowest pressure near center, speed of movement etc., so as to study their correlation with the speed of movement of the tropical cyclone. And with the predictors of previous central pressure, latitude,longitude,speed of movement,productions of numerical forecast of tropical cyclone and so on,stepwise regression equations are established for the speed forecast.

Abstract:Analysis of the daily precipitation in Fuzhou by statistical and wavelet transform methods,the monthly and decade regulations of the rainy frequency with different intensity are obtained.It shows that:(1) The heavy rainfall always break out in the period from March to September,and the serious storms (R≥100mm) are mostly concentrated within the typhoon season (from July to September),but from January to March and November to December,there is none.(2) For the decade distribution,it is constantly symmetrical.(3) The quite period of the heavy storms (R≥50mm) during the recent one hundred and ten years is 14 years.All these results will provide a reliable climatic background for the ordinary heavy rain forecast.

Abstract:During flood happened in Heilongjiang Province , at 500hPa geopotential height circulation anormaly field prevail series ″+-+-″ quasi-stationary planetary wave and the circulation evolution tendency the fore of April-June . When flood happened , it prevail ″A″ rainfall type , or above normal in northern of China and below normal in south China . In June Prevail ″B″ rainfall type , or Huanghe River and the south of China above normal the other below normal,it is also divided by ″B1″ deputy type, or Changjiang River and Songhuajiang River above normal , the other below normal . In May and April prevail ″C″ and ″D″ rainfall type , or Huanghe River above normal and in the south and in the northern region below normal and the northern of Changjiang above normal and the south of Changjiang below normal . And indicate solicitation flood key area that is Huanghe River middle region and northern of Shanxi and Hebei Province above normal .

Abstract:The collapse of TV iron tower of the teaching TV station at Bozhou,Anhui province on 30 August 1999 is caused by a squall.The iron tower endured much great wind beyond the limit criterion in GBJ9 87.Additional,the iron tower locates on one high building near to another high building,these two high buildings form a ′hom′ that makes the wind speed swifter than otherwhere,the high speed wind collapses the TV iron towere.This conclusion is beneficial to the study of high building and iron towere building criterion.