ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 20,Issue 10,1994 Table of Contents
1994, 20(10):3-11.
DOI: 10.7519/j.issn.1000-0526.1994.10.001
Abstract:
An interactive assimilation /retrieval/forecaste circle system d eveloped through a joint NSMC/NMC research to improve the accuracy of the satellite retrievals and their usage in operational NWP is introduced. Firstly,the basic principle of the interactive system,the introduction of the analysis/forecast model and the scheme of satellite retrieval are given. Secondly,the primary results are reported. It can be seen that the interactive circle system is likely to improve the quality of satellite data and make them a useful NWP data source for NWC.
An interactive assimilation /retrieval/forecaste circle system d eveloped through a joint NSMC/NMC research to improve the accuracy of the satellite retrievals and their usage in operational NWP is introduced. Firstly,the basic principle of the interactive system,the introduction of the analysis/forecast model and the scheme of satellite retrieval are given. Secondly,the primary results are reported. It can be seen that the interactive circle system is likely to improve the quality of satellite data and make them a useful NWP data source for NWC.
1994, 20(10):12-16.
DOI: 10.7519/j.issn.1000-0526.1994.10.002
Abstract:
The insolameter recommended in literature [1] was used to measure the data of consecutive luminar variation in clear days,then the data was analysed by spectral statistics to study the activities of the eddies in the boundary layer.The data of the insolametry in Jan. 14th and 15th two clear days was analysed by spectral statistics based on two different kinds of sampling periods(Total recording time),it was concluded that there were fluctuations with different frequency or different period in the whole daytime (eight hours) and two hours period,and the lower frequency partion contributed most to the total energy (almost 2/3),the higher frequency partion also has characteristic period at a few minutes. So the auther assumed the insolameter as a tool to survey the activities of the boundary layer eddies. It can survey the atmosphere media density non-well distributed eddies with horizontal spatial size of 100-1000m. It can also be used in the studies such as the structure of boundry layer eddies,the diffusion of pollutants etc.
The insolameter recommended in literature [1] was used to measure the data of consecutive luminar variation in clear days,then the data was analysed by spectral statistics to study the activities of the eddies in the boundary layer.The data of the insolametry in Jan. 14th and 15th two clear days was analysed by spectral statistics based on two different kinds of sampling periods(Total recording time),it was concluded that there were fluctuations with different frequency or different period in the whole daytime (eight hours) and two hours period,and the lower frequency partion contributed most to the total energy (almost 2/3),the higher frequency partion also has characteristic period at a few minutes. So the auther assumed the insolameter as a tool to survey the activities of the boundary layer eddies. It can survey the atmosphere media density non-well distributed eddies with horizontal spatial size of 100-1000m. It can also be used in the studies such as the structure of boundry layer eddies,the diffusion of pollutants etc.
1994, 20(10):17-20.
DOI: 10.7519/j.issn.1000-0526.1994.10.003
Abstract:
Distributions of large rain regions and precipitation tendency of the whole country in June can be divided into three types: North China type,Changjiang type and South China type. Such distributions of precipitation types associate with Westly circulation change and position in Asia and West Pacific Subtropical high and Indian-Burma low trough. The analysis suggests that the precipitation types in June is related to climatic oscillation of a adecade in recent forty years. It may be associated with influences of atmospheric circulation as well as short-term climatic change of SST.
Distributions of large rain regions and precipitation tendency of the whole country in June can be divided into three types: North China type,Changjiang type and South China type. Such distributions of precipitation types associate with Westly circulation change and position in Asia and West Pacific Subtropical high and Indian-Burma low trough. The analysis suggests that the precipitation types in June is related to climatic oscillation of a adecade in recent forty years. It may be associated with influences of atmospheric circulation as well as short-term climatic change of SST.
1994, 20(10):21-25.
DOI: 10.7519/j.issn.1000-0526.1994.10.004
Abstract:
By using the hourly GMS infrared imagery and conventional meteorological data,an analysis of the heavy rain over Huabei plain and the east of Northwest China during 3-6 August 1993 is made. It is mainly to inquire into the problems with the genesis and development of the meso-α-ascale convective systems which caused severe convective weather. The results shown that the envirinmental conditions,especially the interaction between the cloud system of the middle and low latitudes for the formation of large cloud clusters is very important. The negative area of the wetbulb potential temperature is helpful to the prediction of the emergence of heavy rainfall.
By using the hourly GMS infrared imagery and conventional meteorological data,an analysis of the heavy rain over Huabei plain and the east of Northwest China during 3-6 August 1993 is made. It is mainly to inquire into the problems with the genesis and development of the meso-α-ascale convective systems which caused severe convective weather. The results shown that the envirinmental conditions,especially the interaction between the cloud system of the middle and low latitudes for the formation of large cloud clusters is very important. The negative area of the wetbulb potential temperature is helpful to the prediction of the emergence of heavy rainfall.
1994, 20(10):26-30.
DOI: 10.7519/j.issn.1000-0526.1994.10.005
Abstract:
Monthly precipitation and temperature data for 1951-1992 in China have been gridded with objective analysis procedure,i. e. stepwise search approximation. A comparison of the gridded data with the observational data have been also made with pattern recognition.
Monthly precipitation and temperature data for 1951-1992 in China have been gridded with objective analysis procedure,i. e. stepwise search approximation. A comparison of the gridded data with the observational data have been also made with pattern recognition.
1994, 20(10):31-35.
DOI: 10.7519/j.issn.1000-0526.1994.10.006
Abstract:
Based on the Radar echoes, sounding data, real weather at Yancheng, Jiangsu Province and Fujian Province, an approach to some problems, such as the applicable range of distinguishing of hail cloud with independent parameter conditional probability,the effect of the height of 0℃ level on the distinguishing accuracy,the choice of parameters and so on.
Based on the Radar echoes, sounding data, real weather at Yancheng, Jiangsu Province and Fujian Province, an approach to some problems, such as the applicable range of distinguishing of hail cloud with independent parameter conditional probability,the effect of the height of 0℃ level on the distinguishing accuracy,the choice of parameters and so on.
1994, 20(10):36-39.
DOI: 10.7519/j.issn.1000-0526.1994.10.007
Abstract:
Daily and ten-day water surface evaporation are respectively calculated with the conversion coefficient algorithm,the Penman formula and the Dation formula. The results show that the errors of Dation are the smallest; that of conversion coefficient algorithm are the greatest, and therefore, the method is unsuitable for the calculation of the water surface evaporation for a short range.
Daily and ten-day water surface evaporation are respectively calculated with the conversion coefficient algorithm,the Penman formula and the Dation formula. The results show that the errors of Dation are the smallest; that of conversion coefficient algorithm are the greatest, and therefore, the method is unsuitable for the calculation of the water surface evaporation for a short range.
1994, 20(10):42-45.
DOI: 10.7519/j.issn.1000-0526.1994.10.009
Abstract:
The system is developed on the basis of weather radar digital extreme. It consists of automatic ceding for weather radar network and precipitation echo map printing. The system is prer gramed with 8088 assembler language. The functions and techniques of the system are presented in detail. The automation degree and precision in weather radar operations have been improved obviously with the system.
The system is developed on the basis of weather radar digital extreme. It consists of automatic ceding for weather radar network and precipitation echo map printing. The system is prer gramed with 8088 assembler language. The functions and techniques of the system are presented in detail. The automation degree and precision in weather radar operations have been improved obviously with the system.
1994, 20(10):46-49.
DOI: 10.7519/j.issn.1000-0526.1994.10.010
Abstract:
The storage and extraction of upper-air data is unconvenient due to its large amount. An efficient database system combined compressed upper-air data and software storing and drawing to form a compression and processing system of upper-air data is introduced. Efficiency of compression to upper-air data is more than 80 percent,the inquiry and extraction of upper-air data is convenient.
The storage and extraction of upper-air data is unconvenient due to its large amount. An efficient database system combined compressed upper-air data and software storing and drawing to form a compression and processing system of upper-air data is introduced. Efficiency of compression to upper-air data is more than 80 percent,the inquiry and extraction of upper-air data is convenient.
1994, 20(10):50-55.
DOI: 10.7519/j.issn.1000-0526.1994.10.011
Abstract:
Based on data for the last 40 years,an analysis of the disasters caused by typhoons is made. It is shown that the disasters' are frequent, heavier, while the affected area is vast, and characterized by regionalism and seasonal features.
Based on data for the last 40 years,an analysis of the disasters caused by typhoons is made. It is shown that the disasters' are frequent, heavier, while the affected area is vast, and characterized by regionalism and seasonal features.
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ISSN:1000-0526 CN:11-2282/P