Abstract:By using hemispherical climate anomaly height field intensity and improved scheme of spherical function analysis,the circulation features of 500hPa climate anomaly height field in both northern and southern hemispheres.It is coucluded that,1)the hemispherical climate anomaly height field intensity in winter(northern hemisphere)is stronger than that in summer(southern hemisphere);2)the 500hPa climate anomaly height field is mainly composed of super long and long wave spherical function components(0≤m、k≤6)and characterized by lower order and dimension;3)the spectrum structure of 500hPa climate anomaly height field is more complicated in northern hemisphere(summer) than that in southern hemisphere(winter).The hemispheric 500hPa climate anomaly geopotential height field can be well fitted by supper long and long wave spherical function components with high accuracy.

Abstract:A quasi geostrophic barotropic model is employed for performing four experiments with 24h integration to investigate the impact of meso scale vortex streets in typhoon circulation on the typhoon intensity,and the results are compared to that of single meso scale vortex.Results show that the vortex united twice during the process of relative vorticity transfer(RVT) in the vortex streets.The VRVT of the vortex streets has little impact on the intensity of the typhoon,but VRVT of single meso scale vortex can enhance the typhoon.

Abstract:The influence of the change of the upper level westerly jet on the precipitation intensity and the position of rain band of a torrential rain process in the middle lower reaches of the Yangtze river is investigated in this paper using the MM5 (V2).Numerical experiment results show that the control experiment (CTL) is able to successfully simulate the position of the upper/low level jet and the intensity of precipitation;in the sensitive experiment,the technique used to strengthen/weaken the upper level westerly jet (SJet/WJet) is reasonable as well as feasible.The influencing processes of SJet and WJet on the low level circulation and the precipitation intensity of rain band are different;SJet is favorable to the strengthening of the low level jet,thus leading to the increase of precipitation south of and the reduction north of the rain band in the CTL,this corresponds to the circumstance of the withdrawal of the rain band;while WJet is favorable to the northward advance of the rain band.Therefore,SJet results in the position of torrential rain center south than normal,and WJet leads to the position north than normal.

Abstract:The situation in land degradation has become serious in the west of Liaoning province during the recent decades,and many districts have become ecologically vulnerable areas.The mesoscale model (MM5V3.5) was used to simulate the changes in temperature,sensible heat flux and latent heat flux by means of changing landuse according to the survey data about the land degradation in the west of Liaoning,and using the data in June,2001.Results show that the monthly averaged temperature of June will raise by 0.1～0.7℃ and monthly averaged surface temperature of June will raise by 0.3～1.3℃ at the degradation land area;the sensible heat flux will increase,while the latent heat flux will reduce after the underlying surface state being changed.

Abstract:Clouds have important effect on the Earth Air system radiation budget.This paper investigates the relationship of satellite measurements with global radiation and net radiation in clear and cloudy skies by using radiation theory.We develop some models estimating global radiation and net radiation by using satellite data,and seperal best models of them are selscted.These models can be used to estimat the global and net radiation in clear sky and cloudy sky,thus remedying the stortage of radiation data.

Abstract:Spatial temporal distributive features of autumn (September November) precipitation and temperature in China is analyzed in this paper in the context of 1951-1999 data,the high autumn precipitation regions are found,and then dry/wet autumns and warm/cold autumns are determined and climatic change features of dry/wet years and warm/cold years are investigated.At last,the large scale general circulation background responsible for the autumn climatic anomaly in China,especially in the middle lower reaches of the Yangtze River are studied using the 500hPa geopotential height data.

Abstract:The maximum trapped wavelength and critical emitting angle of elevation for electromagnetic wave to form duct propagation are derived in this paper,the four kinds of necessary conditions are introduced,and the equations for ray propagation situation in atmospheric duct are also given.Comparing the observation of super refraction of radar wave in Nanjing with the model electromagnetic wave propagation path,we could explain the abnormal super refraction echo with the model results.

Abstract:Hemispherical mean monthly abnormal geopotential height fields are divided into hemispherical homogeneous and inhomogeneous parts,and corresponding homogeneous anomaly index ξand inhomogeneous anomaly index ηconstructed.The time lag correlation analyses of ξand ηshow that the duration of ξ in Northern(Southern) hemisphere is significant,and it can persist for 1 year(3 years) in January(July) respectively.The persistence of η is not obvious and the duration generally less than 1 month;the stronger perisistence occurs in stratosphere in northern summer with the longest being 4 months.

Abstract:Monthly mean anomaly data(1969-1998) of mixed layer depth(d_ml) and upper ocean temperature(T_s) are used to analyze the geographic distribution and the seasonal variation in interannual variability of d_ml in the Pacific.Two largest interannual variability zones of d_ml are found in the high latitude area in the North Pacific and in the central western equatorial Pacific.The latter is primarily concerned.The climatic location of d_ml,the correlation between d_ml anomalies and El Nino events,and the eastward propagation of positive d_ml anomalies along the equator preliminarily accompanied with a strong El Nino event are analyzed.

Abstract:The monthly mean temperature data at 160 stations in China during 1951-2000 are used,and among which 20 stations are selected as representative stations of Northeast China.On the basis of the analysis of seasonal and inter annual variations,the inter annual and inter decadal variations of summer temperature in Northeast China are emphatically studied in this paper.It is found that summer temperature in Northeast China is slightly warmer before 1956,is the lowest in 1956-1970's,slowly began to rise in 1980's,got much warmer in 1990's.The warming trend is obvious in the recent 50 years,with a warming rate of 0.235℃/10a.The summer temperature anomaly shows the three year,four year,seven year and sixteen year periodic variations in Northeast China.The warming trend is similar with that in North China,but it is opposite to that in areas south of the Huanghe River.The rising of summer temperature in Northeast China is one of the most prominent in China.

Abstract:The initial fields of MM5 are improved in this paper by adopting an initialization scheme of simultaneously adjusting thermodynamic and dynamic variables and coordinating humidity and temperature changes,and by assimilating R-Zdata into the initial field.Experimental results show that the improved initialization of MM5 can raise the forecast accuracy of precipitation location and rainfall,expecially of 0～6h,and the thermodynamic variable adjustment is more important than the dynamic variable adjustment in improving the forecast of precipitation location.

Abstract:Using a wind product cloud drift wind derived from GMS-5 geostationary satellit images to modity the initial wind field of a limited area numerical model in mesoscale η coordinate,the processes of the precipitation on 27-28 and 28-29 July 2001 were simulated and compared with that of a numerical simulation without modification.The result shows that there is a great improvement in the simulation for precipitation forecast through adjustment of the wind field by incorporating the cloud drift wind data into a numerical model because it remedied the fail to make forecast of meso-and micro-scale weather systems which was caused by insufficient observation stations.

Abstract:Mexican Hat wavelet and Haar wavelet transform are used to analyze relations of opening river and closing river time with preutous climate changes in the Three-River Plain.Results show that the temperature of March is significantly to the time of opening-river,and the temperature and rainfall of August,the temperature of October,and the rainfall of September-October,are related to the time of closing river.

Abstract:A model for predicting the global ultraviolet radiation arriving at the ground surface is developed in this paper on the basis of the parameterization scheme by Chen Wan long,the height amending equation of Frederick model and NWS'cloudness amending equation,and predictions of ultraviolet radiation intensity are performed.Results show that under a clear sky the model can satisfactorily reflect the variational trend of ultraviolet radiation fairily well,and under a complicated sky circumstance such as a part cloudy,cloudy,or over cast sky,the forecast errors are relatively larger,however it can basically reflect the variational trend and law of ultraviolet radiation intensity.The model allows for various influencing factors,and may be applied to the prediction of ultraviolet radition intensity in cities.

Abstract:The structure,principle,function technique target and apply condition of a new pattern multifunctional weighing/batching control system are elaborated in this paper.Experiments show that the system is an intelligenized system which incorporate weighting display and batching control,thus having a wide application perspective.

Abstract:The object oriented Technology is a mainstream method to develop software,and its features are encapsulation,inheritance and polymorphism.Their application to the Die CAD System based on template is discussed,and their effects are analyzed in improving the expandability of the system and reducing the complicacy of the system.Some examples are also given in this paper to account for the problems.

Abstract:For the study of the best-assembled investment with the maximum earning and least risk,a model of multi-objective project is built and then is transformed into a simple target programming problem by fuzzy evaluation,which is solved by using the genetic algorithm.The coding rule and steps of the algorithm are also given,and at last,an example shows the reasonableness of the model and the effectiveness of the algorithm.

Abstract:Firstly,this paper picks up area characters of the object including area,bary centeric moment,the round degree,slightness degree and nucleoplasm ratio of the geometrical modality.The sign method of single antetype and the least space sort-implement are used to constract a distinguish funtion.Finally,by comparing and computing area character of Squamous-cell,the author elects characteristic vectors through which sorts squamous cells can be discerned obviously,establishes the distinguish function and discusses the reliability of results.