ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 26,Issue 5,2000 Table of Contents
2000, 26(5):3-7.
DOI: 10.7519/j.issn.1000-0526.2000.5.001
Abstract:
The effect of north Pacific SST anomaly in the middle latitute,which is both active and significantly correlative with rainfall in China,on precipitation was simulated by means of OSU-AGCM.The results show that SST decrease in a large scale may cause more rainfall in north China and less precipitation in south China with a boundary at about 40°N latatute.At the same time significant changes take place for precipitation in north Pacific in the middle and low latitute.The mechanism of the impact of SST anomaly on precipitation was discussed through analysing the variation of the atmospheric physical fields caused by SST anomaly and some useful results were obtained.
The effect of north Pacific SST anomaly in the middle latitute,which is both active and significantly correlative with rainfall in China,on precipitation was simulated by means of OSU-AGCM.The results show that SST decrease in a large scale may cause more rainfall in north China and less precipitation in south China with a boundary at about 40°N latatute.At the same time significant changes take place for precipitation in north Pacific in the middle and low latitute.The mechanism of the impact of SST anomaly on precipitation was discussed through analysing the variation of the atmospheric physical fields caused by SST anomaly and some useful results were obtained.
2000, 26(5):8-12.
DOI: 10.7519/j.issn.1000-0526.2000.5.002
Abstract:
The rainfall predicting values from T106 and HLAFS of NWC,BP neuron and dynamic similar method of Shanxi Meteorological Observatory were used for prediction factors.By using of grey theory,the original sequence of the predicting factors and actual rainfall sequence were conducted for accumulating process,respectively,then the random weakened increasing sequence were obtained.The recurrence calculation with Kalman filter method was used to acquire the rainfall predicting values.The values were retrieved to initial state,and the rainfall prediction for every county was given.The experiment in Summer in 1998 was conducted and obtained a good result in rainfall prediction.
The rainfall predicting values from T106 and HLAFS of NWC,BP neuron and dynamic similar method of Shanxi Meteorological Observatory were used for prediction factors.By using of grey theory,the original sequence of the predicting factors and actual rainfall sequence were conducted for accumulating process,respectively,then the random weakened increasing sequence were obtained.The recurrence calculation with Kalman filter method was used to acquire the rainfall predicting values.The values were retrieved to initial state,and the rainfall prediction for every county was given.The experiment in Summer in 1998 was conducted and obtained a good result in rainfall prediction.
3 Contrast Experiments on Methods for Retrieving Two-Dimensional Wind from Single-Doppler Radar Data
2000, 26(5):13-16.
DOI: 10.7519/j.issn.1000-0526.2000.5.003
Abstract:
Four methods for retrieving two-dimensional wind from single-Doppler radar data were introducted,they are the VAP method,rotation-divergence method,simple adjoint method,and the PAR method.Three experiments were conducted using simulated single-Doppler radar data to compare the methods.It is shown that different methods have different results.The root-mean-square errors of the tangential velocity and angle also support the main results.
Four methods for retrieving two-dimensional wind from single-Doppler radar data were introducted,they are the VAP method,rotation-divergence method,simple adjoint method,and the PAR method.Three experiments were conducted using simulated single-Doppler radar data to compare the methods.It is shown that different methods have different results.The root-mean-square errors of the tangential velocity and angle also support the main results.
2000, 26(5):17-19.
DOI: 10.7519/j.issn.1000-0526.2000.5.004
Abstract:
By comparing the test between Campbell-Stokes,Jordan sunshine recorder and pyrheliometer,the threshold value of Campbell-Stokes sunshine recorder is 120W·m-2or so.IRSR which is defined by WMO is right.The record of Jordan is 5% less than that of Campbell-Stokes and most of this error appear at sunrise or sunset.In the main,Jordan is suitable for routine observations.Pyrheliometer can be used as standard of threshold value.If the deviation of tracking sun is overcome,it can be used as a sunshine sensor,or the accuracy is hard to meet the demands.
By comparing the test between Campbell-Stokes,Jordan sunshine recorder and pyrheliometer,the threshold value of Campbell-Stokes sunshine recorder is 120W·m-2or so.IRSR which is defined by WMO is right.The record of Jordan is 5% less than that of Campbell-Stokes and most of this error appear at sunrise or sunset.In the main,Jordan is suitable for routine observations.Pyrheliometer can be used as standard of threshold value.If the deviation of tracking sun is overcome,it can be used as a sunshine sensor,or the accuracy is hard to meet the demands.
2000, 26(5):20-23.
DOI: 10.7519/j.issn.1000-0526.2000.5.005
Abstract:
The 5-day average of the 500hPa height field as predictors and the pentad regional precipitation of 4 areas in sanxia,China as predictands were used to build the BP Canonical Correlation Analysis(BP-CCA)model.The forecast skills of BP-CCA for the precipitation of 4 areas were estimated by using a cross-validation technique.The forecast test shows that the predictive skills of BP-CCA for areal precipitation forecast in sanxia areas are good enough for the operational medium range weather forecast and the results are valuable for reference to forecasters.
The 5-day average of the 500hPa height field as predictors and the pentad regional precipitation of 4 areas in sanxia,China as predictands were used to build the BP Canonical Correlation Analysis(BP-CCA)model.The forecast skills of BP-CCA for the precipitation of 4 areas were estimated by using a cross-validation technique.The forecast test shows that the predictive skills of BP-CCA for areal precipitation forecast in sanxia areas are good enough for the operational medium range weather forecast and the results are valuable for reference to forecasters.
2000, 26(5):24-26.
DOI: 10.7519/j.issn.1000-0526.2000.5.006
Abstract:
Three basic color soft lights are gradually and extensively applied to TV news and TV weather forecast program-making because of its high technology index and the feature of energy saving.The function and structure of the three basic color soft lights were analysed,and Its correct use method in the TV weather forecast programs making was discussed.
Three basic color soft lights are gradually and extensively applied to TV news and TV weather forecast program-making because of its high technology index and the feature of energy saving.The function and structure of the three basic color soft lights were analysed,and Its correct use method in the TV weather forecast programs making was discussed.
2000, 26(5):27-31.
DOI: 10.7519/j.issn.1000-0526.2000.5.007
Abstract:
The influence of 500hPa geopotential height anomaly sustained fluctuation last summer on flood season rainfall in the middle and lower reaches of Changjiang River was studied.The results indicate that the anomaly accumulation index in subtrotical area is related to flood season rainfall in the middle and lower reaches of Changjiang River and rainfall distribution in China.
The influence of 500hPa geopotential height anomaly sustained fluctuation last summer on flood season rainfall in the middle and lower reaches of Changjiang River was studied.The results indicate that the anomaly accumulation index in subtrotical area is related to flood season rainfall in the middle and lower reaches of Changjiang River and rainfall distribution in China.
2000, 26(5):32-35.
DOI: 10.7519/j.issn.1000-0526.2000.5.008
Abstract:
Based on the data of monthly mean air temperature,precipitation,maximum and minimum air temperature from 25 stations in 1951-1998,the climate change and its characteristics in Liaoning Province in recent 48 years and in recent 10 years were analyzed and studied comprehensively.
Based on the data of monthly mean air temperature,precipitation,maximum and minimum air temperature from 25 stations in 1951-1998,the climate change and its characteristics in Liaoning Province in recent 48 years and in recent 10 years were analyzed and studied comprehensively.
2000, 26(5):36-38.
DOI: 10.7519/j.issn.1000-0526.2000.5.009
Abstract:
9907 typhoon depression moved northwest,came into Shandong province from Yellow Sea on August 9 night,11-12 with westerlies system interaction,and caused a heavy rain or very heavy rain in part area of Shandong.Heavy rain area located at the intersection of the southeast low-level jet,in the right side of the upper-level jet entrance and the typhoon depression moving direction,and the weak cold air of westerlies.
9907 typhoon depression moved northwest,came into Shandong province from Yellow Sea on August 9 night,11-12 with westerlies system interaction,and caused a heavy rain or very heavy rain in part area of Shandong.Heavy rain area located at the intersection of the southeast low-level jet,in the right side of the upper-level jet entrance and the typhoon depression moving direction,and the weak cold air of westerlies.
2000, 26(5):39-43.
DOI: 10.7519/j.issn.1000-0526.2000.5.010
Abstract:
With Principal Component (PC) and Rotated Principal Component (RPC) analysis,the spatial anomaly characteristics of flood season rainfall over the Tibetan Plateau were studied by using 26 observational stations precipitation data of rainy season (from May to September) over the Tibetan Plateau from 1973 to 1998.Results show that the first three loading vector field could reflect the whole wet season anomaly structures of rainfall over the Plateau,for example,wet (dry) in all area pattern,wet (dry) in north and dry (wet) in south pattern,wet (dry) in west and dry (wet) in east pattern.The first six rotated loading vector field represent six principal anomaly regions:Southeast part,northeast part,midwest region of Naqu,Yalu Zangbu River basin,the margin zone of south Plateau and northwest part.
With Principal Component (PC) and Rotated Principal Component (RPC) analysis,the spatial anomaly characteristics of flood season rainfall over the Tibetan Plateau were studied by using 26 observational stations precipitation data of rainy season (from May to September) over the Tibetan Plateau from 1973 to 1998.Results show that the first three loading vector field could reflect the whole wet season anomaly structures of rainfall over the Plateau,for example,wet (dry) in all area pattern,wet (dry) in north and dry (wet) in south pattern,wet (dry) in west and dry (wet) in east pattern.The first six rotated loading vector field represent six principal anomaly regions:Southeast part,northeast part,midwest region of Naqu,Yalu Zangbu River basin,the margin zone of south Plateau and northwest part.
2000, 26(5):44-47.
DOI: 10.7519/j.issn.1000-0526.2000.5.011
Abstract:
Decision-making meteorological service system for flood prevention of Hubei province collects or displays the hydrological and meteorological information of great weather processes and the information of river,lake and reservoir′s flood prevention.It can also provide products of drainage area hyetal statistics and forecast,and give the decision making service of flood prevention for all government departments and flood prevention department.The system structure,main function designing,software realizing method of the decision-making meteorological service system for flood prevention of Hubei province and its testing results were also introduced.
Decision-making meteorological service system for flood prevention of Hubei province collects or displays the hydrological and meteorological information of great weather processes and the information of river,lake and reservoir′s flood prevention.It can also provide products of drainage area hyetal statistics and forecast,and give the decision making service of flood prevention for all government departments and flood prevention department.The system structure,main function designing,software realizing method of the decision-making meteorological service system for flood prevention of Hubei province and its testing results were also introduced.
2000, 26(5):48-50.
DOI: 10.7519/j.issn.1000-0526.2000.05.012
Abstract:
(1)The changing characteristics of maximum loading factors of the first 6 principal components in Principal Component Analysis (PCA) on 145 statistical items of 13 observed indexes were:annual sunshine hours decreased gradually during the 1970s and the 1980s,but it has increased evidently since the begining of the 1990s:and there was a decreasing trend in annual average temperature from the 1960s to the 1980s,but it has rised evidently since the 1990s;average wind velocity in October gradually reduced from the mid 1970 to the mid 1980s,then increased;the days of annual strong wind increased wavily;annual maximum wind velocity constantly lifted the change of rainfall in August.The local climatic conditions had a good developing trend before the middle of 1980s,but since the late 1980s it has been deteriortated.(2)The change of annual sandstorm days was similar to annual sunshine hours;the distributing characters of annual maximum temperature,annual average ground temperature and maximum temperature in July were similar to annual average temperature;the distributing character of annual strong wind days was similar to the average wind velocity in October.(3)The climatic condition had shown some improvements from the mid 1960s to the mid 1980s due to trees planted and shrubs in large scale since the 1960s,and it was deteriorating since the late 1980s concerned with the drop of groud water table and died off of man made sand fix forest.
(1)The changing characteristics of maximum loading factors of the first 6 principal components in Principal Component Analysis (PCA) on 145 statistical items of 13 observed indexes were:annual sunshine hours decreased gradually during the 1970s and the 1980s,but it has increased evidently since the begining of the 1990s:and there was a decreasing trend in annual average temperature from the 1960s to the 1980s,but it has rised evidently since the 1990s;average wind velocity in October gradually reduced from the mid 1970 to the mid 1980s,then increased;the days of annual strong wind increased wavily;annual maximum wind velocity constantly lifted the change of rainfall in August.The local climatic conditions had a good developing trend before the middle of 1980s,but since the late 1980s it has been deteriortated.(2)The change of annual sandstorm days was similar to annual sunshine hours;the distributing characters of annual maximum temperature,annual average ground temperature and maximum temperature in July were similar to annual average temperature;the distributing character of annual strong wind days was similar to the average wind velocity in October.(3)The climatic condition had shown some improvements from the mid 1960s to the mid 1980s due to trees planted and shrubs in large scale since the 1960s,and it was deteriorating since the late 1980s concerned with the drop of groud water table and died off of man made sand fix forest.
2000, 26(5):51-54.
DOI: 10.7519/j.issn.1000-0526.2000.5.013
Abstract:
The relationship between water supply in Shijiazhuang city and meteorological conditions were analyzed by using the successive regression.The result shows that the water supply in the city has a positive correlation with the temperature in all seasons,with precipitation,wind and humidity in summer,a negative correlation with precipitation,wind and humidity in winter,spring and fall,and an obvious correlation with some synthetic meteorological indexes such as:sultry index,and with special weather,for example,the foehn.A regression equations reflect the character that water supply is largest in summer (temperature is highest,humility is also highest) and least in winter (temperature is lowest).
The relationship between water supply in Shijiazhuang city and meteorological conditions were analyzed by using the successive regression.The result shows that the water supply in the city has a positive correlation with the temperature in all seasons,with precipitation,wind and humidity in summer,a negative correlation with precipitation,wind and humidity in winter,spring and fall,and an obvious correlation with some synthetic meteorological indexes such as:sultry index,and with special weather,for example,the foehn.A regression equations reflect the character that water supply is largest in summer (temperature is highest,humility is also highest) and least in winter (temperature is lowest).
Mobile website
® 2024 All Rights Reserved
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
ISSN:1000-0526 CN:11-2282/P