Abstract:A review on the distilling climatic and environmental information from tree ring hydrogen isotope and thein application and achievements to global climatic change is conducted, and the existent problems and prospects in this field are also investigated.

Abstract:Genetic Algorithm (GA) is a current method for the optimal estimation of model parameters. Genetic algorithm is applied to optimize the parameters of heavy rain intensity formula of different reappearance periods in some regions. The calculated results show that the method of genetic algorithm has the direct perceptibility, simplicity, and generality.

Abstract:In the view of data analyses, it is indicated that the variation of general circulation systems such as the subtropical westerly jet in both Hemispheres, the easterly jet, the Tibetan Plateau high and the Mexican high is greatly different between the period that the summer monsoon is in activity in the South China Sea (SCS) and the period that the SCS monsoon is in inactivity. The results are also shown that the activity or inactivity of the summer monsoon in the SCS is determined by the different phase of the northward propagating low frequency oscillation (LFO) of wind divergence field from the Southern Hemisphere and the phase of southward propagating LFO of westerly wind field from the Northern Hemisphere. And the phase locked of different type LFO in the SCS is the determinant factor in controlling the timing of activity of the SCS monsoon.

Abstract:Based on GPS (Global Positioning System) data observed at the intervals of half an hour during the period of the Huanan (South China) Torrential Rainfall Experiment from 5 May to 26 June 1998,analysis results reveal that the characteristics of moisture variation and moisture increasing manner of the total water content with in the local column air.It indicates that increasing and decreasing of the total water content within the column in of discontinuity evidently.This is directly associated with variation of general circulation and with outbreak of Huanan Torrential Rainfall.

Abstract:The strong clear air turbulence is the outburst gale which takes place at the seashore area in winter and often causes the disastrous nautical accidents.The physical causation and forecast of the strong clear air turbulence according to atmospheric circulation characters are discussed.It comes to the conclusion that the strong clear air turbulence is caused by the energy transition of the baroclinic atmosphere,the activity of northwest jet and the momentum downward transfer.On the basis of these analyses,the forecast idea and method of the strong clear air turbulence,are brought forward.

Abstract:The atmospheric circulation, the intensity of cold air and the thermal instability are analyzed through the twenty-three cases of sandstorm weather events affecting Xining region. The scientific method of the sandstorm weather now forecasting in Xining region are obtained.

Abstract:Summer temperature anomalies (June to August) at 11 stations in Jiangsu Province from 1961 to 1999 are analyzed in terms of the EOF analysis .The 500 hPa height and sea temperature fields are also analyzed and some useful results for the prediction of summer temperature are abtained.

Abstract:According to the 40 year (1958 to 1997) record of global reanalysis data of atmospheric fields from NCEP/NCAR (National Centers for Environmental Prediction and National Center for Atmospheric Research,USA), a display system was developed by applying the database software Visual Foxpro and the meteorological software package GrADS. It has the function of displaying kinds of figures in agreement with user′s choice in area, time and map projection, and exporting the data in usual format.

Abstract:By using the methods of MOS and Kalman filter, two forecasting models for Hefei′s air pollution are established. The models provide the necessary supporting technology to make the forecast of air pollution at Hefei City.

Abstract:Combined with prediction factors which are turned out to be preferable by practice forecasting, a forecasting system of tropical cyclone track is developed by the k-nn method. The results show that it is satisfying, and can apply to routine operational forecasting as well.

Abstract:A new method,rolling correlative analysis, which can generally investigate the history data is introduced,and then the comparison analysis between rolling correlation and general correlation methods is carried out.The results show that the correlation of the factors which are gained from rolling correlation method is more stable,and its forecast accuracy is better than general correlation method.

Abstract:Based on the temperature data for 45 years (1955-1999) in heating days,a meteorological service system for the various periods is studied.It can provide the beginning and ending heating data,respectively.It can also provide the temperature forecast hour by hour.The system has a good social and economic benefits.

Abstract:Based on the synchronization data of Tianjin intestinal infection and the meteorological observation,the periodic law of outbreak of intestinal infection caused by meteorological factors was analyzed and the regression forecast equations of monthly intestinal infection were given.The results show that the forecasting effect is satisfying.