ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 22,Issue 4,1996 Table of Contents
1996, 22(4):3-7.
DOI: 10.7519/j.issn.1000-0526.1996.4.001
Abstract:
Three higher-accurate boundary conditions is introduced. The first-order spacial differential is calculated by using the Spline function,and a set of simpler calculating formulation of the Hermite method is presented. Comparisons of the interpolation errors among the Lagrangian,the Spline and the Hermite schemes for different locations of the interpolation points are made. The results show that although these schemes have given accuracies to some extent,the error of the Hermite method with periodic boundary condition is around one fourth or a half of the errors of other boundary conditions,and is about one order of magnitude smaller than that of the Lagrangian technique.
Three higher-accurate boundary conditions is introduced. The first-order spacial differential is calculated by using the Spline function,and a set of simpler calculating formulation of the Hermite method is presented. Comparisons of the interpolation errors among the Lagrangian,the Spline and the Hermite schemes for different locations of the interpolation points are made. The results show that although these schemes have given accuracies to some extent,the error of the Hermite method with periodic boundary condition is around one fourth or a half of the errors of other boundary conditions,and is about one order of magnitude smaller than that of the Lagrangian technique.
1996, 22(4):8-12.
DOI: 10.7519/j.issn.1000-0526.1996.4.002
Abstract:
Based on the monthly mean sea level pressure data during the years of 1951-1994,the East Asia summer monsoon intensity index has been suggested. The statistical results show that the variation of summer rain belt pattern relates closely to the strength of summer monsoon in the East Asia. It was found that when the strong monsoon years,the positive anomaly of precipitation would appear in the north China (Pattern Ⅰ rain belt),when the week monsoon years,the summer rain belt would appear in the south China (Pattern Ⅲ rain belt) ；when the normal monsoon years,the summer rain belt would appear in central China (Pattern Ⅱ rain belt). The onset time of summer monsoon in the East Asia is one of the factors affecting the strength of summer monsoon. The stronger summer monsoon is predominant when the summer monsoon established early in East Asia ion the contrary,the weaker summer monsoon is predominant. These results would be useful for the long range forecasting of rainfall anomaly pattern.
Based on the monthly mean sea level pressure data during the years of 1951-1994,the East Asia summer monsoon intensity index has been suggested. The statistical results show that the variation of summer rain belt pattern relates closely to the strength of summer monsoon in the East Asia. It was found that when the strong monsoon years,the positive anomaly of precipitation would appear in the north China (Pattern Ⅰ rain belt),when the week monsoon years,the summer rain belt would appear in the south China (Pattern Ⅲ rain belt) ；when the normal monsoon years,the summer rain belt would appear in central China (Pattern Ⅱ rain belt). The onset time of summer monsoon in the East Asia is one of the factors affecting the strength of summer monsoon. The stronger summer monsoon is predominant when the summer monsoon established early in East Asia ion the contrary,the weaker summer monsoon is predominant. These results would be useful for the long range forecasting of rainfall anomaly pattern.
1996, 22(4):13-16.
DOI: 10.7519/j.issn.1000-0526.1996.04.003
Abstract:
The parameters of raindrop size distribution for three precipitation processes,the M－P distribution and the Γ-distribution have been calculated. Meanwhile the shapes of raindrop size distribution have been calculated,and the relationship between the shapes and the precipitation intensity has been analysed.
The parameters of raindrop size distribution for three precipitation processes,the M－P distribution and the Γ-distribution have been calculated. Meanwhile the shapes of raindrop size distribution have been calculated,and the relationship between the shapes and the precipitation intensity has been analysed.
1996, 22(4):17-19.
DOI: 10.7519/j.issn.1000-0526.1996.04.004
Abstract:
There was normal or more precipitation in the most of China in 1995,but there was a seasonal variance of precipitation distribution. The Spring drought extent was larger in the North,the continuous drought was very serious in Shanxi and Gansu provinces in winter,spring and summer. Hard rain was frequent in Jiangnan and the southern part of Northeast in summer,and the flooding occurred in some regions. The thermal condition was better and the sunshine level was poor. Landed typhoon and tropical storm was more than normal. Some regions were hit by hailstorm and dust devil.
There was normal or more precipitation in the most of China in 1995,but there was a seasonal variance of precipitation distribution. The Spring drought extent was larger in the North,the continuous drought was very serious in Shanxi and Gansu provinces in winter,spring and summer. Hard rain was frequent in Jiangnan and the southern part of Northeast in summer,and the flooding occurred in some regions. The thermal condition was better and the sunshine level was poor. Landed typhoon and tropical storm was more than normal. Some regions were hit by hailstorm and dust devil.
1996, 22(4):20-23.
DOI: 10.7519/j.issn.1000-0526.1996.4.005
Abstract:
General circulation features over the Northern Hemisphere in 1995 are analysed. It is shown that the 500hpa subtropical high over the West Pacific was stronger than normal. Its ridge line moved southward in early summer and northward in mid-summer. Meridional circulation was developed in spring,blocking pattern was stable in early summer,zonal circulation was dominant in mid-summer in Asia. 500hpa geopotential height was higher in summer and lower in winter in Qingzang Plateau. 100hpa geopotential height was persistently higher at the low latitudes and lower in mid latitude,the South Asia high was stronger. The El Nino event occured in 1994 ended in March in 1995.
General circulation features over the Northern Hemisphere in 1995 are analysed. It is shown that the 500hpa subtropical high over the West Pacific was stronger than normal. Its ridge line moved southward in early summer and northward in mid-summer. Meridional circulation was developed in spring,blocking pattern was stable in early summer,zonal circulation was dominant in mid-summer in Asia. 500hpa geopotential height was higher in summer and lower in winter in Qingzang Plateau. 100hpa geopotential height was persistently higher at the low latitudes and lower in mid latitude,the South Asia high was stronger. The El Nino event occured in 1994 ended in March in 1995.
1996, 22(4):24-26.
DOI: 10.7519/j.issn.1000-0526.1996.4.006
Abstract:
The world climate in 1995 was generally warmer than normal,especially during winter at the mid-high latitudes over the Northern Hemisphere. In summer,large sections of subtropical zones in the Northern Hemisphere were hit by heat wave. Severe droughts persisted in southern Africa and Australia. Serious floods happened in West Europe and the USA California State during winter and in the monsoon regions during summer or autumn.
The world climate in 1995 was generally warmer than normal,especially during winter at the mid-high latitudes over the Northern Hemisphere. In summer,large sections of subtropical zones in the Northern Hemisphere were hit by heat wave. Severe droughts persisted in southern Africa and Australia. Serious floods happened in West Europe and the USA California State during winter and in the monsoon regions during summer or autumn.
1996, 22(4):27-31.
DOI: 10.7519/j.issn.1000-0526.1996.4.007
Abstract:
Based on the daily-per-hour precipitation data from 54 meteorological stations in Jilin Province during 1960-1992 ,sudden cloud-burst process has been analysed and defined. Spatical and temporal distribution and orgraphic influence of unexpectedly hard rain (local suddenly storm rainfall,areal abruptly rain gush,spate) has been analysed. The results show that there were difference between time distribution and orgraphic distribution,which provided climatic scenario foundation for the weather analysis forecast.
Based on the daily-per-hour precipitation data from 54 meteorological stations in Jilin Province during 1960-1992 ,sudden cloud-burst process has been analysed and defined. Spatical and temporal distribution and orgraphic influence of unexpectedly hard rain (local suddenly storm rainfall,areal abruptly rain gush,spate) has been analysed. The results show that there were difference between time distribution and orgraphic distribution,which provided climatic scenario foundation for the weather analysis forecast.
1996, 22(4):32-36.
DOI: 10.7519/j.issn.1000-0526.1996.4.008
Abstract:
Utilizing the data of digitized color satellite cloud image,the active law and the feature of five MCC causing heavy rain in medial June 1994 in the area of South China were analyzed. The feature of satellite cloud image and the cause of MCC causing in the middle-low latitude were discussed.
Utilizing the data of digitized color satellite cloud image,the active law and the feature of five MCC causing heavy rain in medial June 1994 in the area of South China were analyzed. The feature of satellite cloud image and the cause of MCC causing in the middle-low latitude were discussed.
1996, 22(4):37-40.
DOI: 10.7519/j.issn.1000-0526.1996.04.009
Abstract:
Synthetic analysis of the physical parameters of 19 severe torrential rain events in Jiangxi Province is presented. The dynamic and thermal conditions and the physical background that caused the severe rain in the area are given. The forecasting focus Of regional severe torrential rain is suggested.
Synthetic analysis of the physical parameters of 19 severe torrential rain events in Jiangxi Province is presented. The dynamic and thermal conditions and the physical background that caused the severe rain in the area are given. The forecasting focus Of regional severe torrential rain is suggested.
1996, 22(4):41-45.
DOI: 10.7519/j.issn.1000-0526.1996.4.010
Abstract:
The two-dimensional image data of ice and snow particles and the shape features of snow particles and the shape features of snow particles from the measurements of 13 flights equipped with the particle Measuring System (PMS) during 1991-1993 are analyzed,with the focus on the occurrence frequency and the size distribution of graupel particles. Based on certain assumptions,the accumlated super cooled water content in the clouds above the oberservational level is estimated according to the diameters of graupel particles,so as to find out the potential of artificial precipitation above the operating level. The primary results indicate that graupel particles were found in .the operating processes of many flights of different durations; the estimated maximum integrated supercooled water content is 130 g/m2. It can be seen from the duration percentages of graupels in the processes of the flights that supercooled water is distributed horizontally and the graupel particle percentage varies greatly in different flight. In addtion,the comparison of the data obtained in the same flight indicates that the higher the altitude and the temperature,the lower graupel particle percentage is observed.
The two-dimensional image data of ice and snow particles and the shape features of snow particles and the shape features of snow particles from the measurements of 13 flights equipped with the particle Measuring System (PMS) during 1991-1993 are analyzed,with the focus on the occurrence frequency and the size distribution of graupel particles. Based on certain assumptions,the accumlated super cooled water content in the clouds above the oberservational level is estimated according to the diameters of graupel particles,so as to find out the potential of artificial precipitation above the operating level. The primary results indicate that graupel particles were found in .the operating processes of many flights of different durations; the estimated maximum integrated supercooled water content is 130 g/m2. It can be seen from the duration percentages of graupels in the processes of the flights that supercooled water is distributed horizontally and the graupel particle percentage varies greatly in different flight. In addtion,the comparison of the data obtained in the same flight indicates that the higher the altitude and the temperature,the lower graupel particle percentage is observed.
1996, 22(4):46-50.
DOI: 10.7519/j.issn.1000-0526.1996.04.011
Abstract:
According to the characteristics of differences between the changes of accumulating sucrose of sugar-cane variety in different mature period and the high sucrose content pened,the model of sucrose content acumulation of development has been used to analyze the relationship between the combination form of different mature period and the sucrose content in crushing season. The effect of the rational compose of the different mature period on lengthening high sucrose content period and cultivation of average sucrose content in the crushing season is revealed theoritically. The calculation principle and way of plant ratio is given. The guiding basis for Sugar Mill defining the plant ratio of the different mature period variety is provided and the economic benefits could be improved.
According to the characteristics of differences between the changes of accumulating sucrose of sugar-cane variety in different mature period and the high sucrose content pened,the model of sucrose content acumulation of development has been used to analyze the relationship between the combination form of different mature period and the sucrose content in crushing season. The effect of the rational compose of the different mature period on lengthening high sucrose content period and cultivation of average sucrose content in the crushing season is revealed theoritically. The calculation principle and way of plant ratio is given. The guiding basis for Sugar Mill defining the plant ratio of the different mature period variety is provided and the economic benefits could be improved.
1996, 22(4):51-54.
DOI: 10.7519/j.issn.1000-0526.1996.04.012
Abstract:
The occurrence law of dry-hot wind is preliminarily analysed by means of 38 years meteorological data in Suizhou city,Hubei province,and some countermeansures are given.
The occurrence law of dry-hot wind is preliminarily analysed by means of 38 years meteorological data in Suizhou city,Hubei province,and some countermeansures are given.
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ISSN:1000-0526 CN:11-2282/P