ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 24,Issue 8,1998 Table of Contents
1998, 24(8):3-7.
DOI: 10.7519/j.issn.1000-0526.1998.8.001
Abstract:
Taking acount of the latent heat of the vapour condensation in the atmosphere,the concept of the wet Q vector was proposed. An expression of the wet Q vector and the non geostrophic ω equation,in which the divergence of wet Q vector was taken as a forcing term,was derived. By using routine meteorological data for diagnostric analysis,the results show that the wet Q vector is better than the quasi geostrophic Q vector in the low latitude area.
Taking acount of the latent heat of the vapour condensation in the atmosphere,the concept of the wet Q vector was proposed. An expression of the wet Q vector and the non geostrophic ω equation,in which the divergence of wet Q vector was taken as a forcing term,was derived. By using routine meteorological data for diagnostric analysis,the results show that the wet Q vector is better than the quasi geostrophic Q vector in the low latitude area.
1998, 24(8):8-13.
DOI: 10.7519/j.issn.1000-0526.1998.8.002
Abstract:
During early 1990s,the indices of Western Pacific Subtropical High are abnormal,e.g.,the Area Index and Strength Index of High are too high to be reliable. The possible reason is discussed,and the change of 500hPa geopotential height filed for calculating those indices should be in change of the abnormality. The National Climate Center 500hPa geopotential heights of T42 model from November 1991 to February 1996 are corrected through the NCEP/NCAR reanalysis 500hPa heights. And based on the corrected 500hPa heights,the indices for the abnormal period are recalculated.
During early 1990s,the indices of Western Pacific Subtropical High are abnormal,e.g.,the Area Index and Strength Index of High are too high to be reliable. The possible reason is discussed,and the change of 500hPa geopotential height filed for calculating those indices should be in change of the abnormality. The National Climate Center 500hPa geopotential heights of T42 model from November 1991 to February 1996 are corrected through the NCEP/NCAR reanalysis 500hPa heights. And based on the corrected 500hPa heights,the indices for the abnormal period are recalculated.
1998, 24(8):14-17.
DOI: 10.7519/j.issn.1000-0526.1998.8.003
Abstract:
The meteorological information,such as precipitation and thermo hydric status in atmosphere,could be easily obtained at any time. How to use these data to report the seasonal drought change,for example,based on the characteristic of rainfall: seasonal and effective precipitation,the hysteresis of soil layer moisture and according to the thermo hydric status in the atmosphere,the drought index was developed. The drought seasonal monitoring and forecast and the measurement of the drought disater degree was also studied simultaneously.
The meteorological information,such as precipitation and thermo hydric status in atmosphere,could be easily obtained at any time. How to use these data to report the seasonal drought change,for example,based on the characteristic of rainfall: seasonal and effective precipitation,the hysteresis of soil layer moisture and according to the thermo hydric status in the atmosphere,the drought index was developed. The drought seasonal monitoring and forecast and the measurement of the drought disater degree was also studied simultaneously.
1998, 24(8):18-21.
DOI: 10.7519/j.issn.1000-0526.1998.08.004
Abstract:
Based on a great deal of historical data of agriculture and meteorology,a service system was developed to offer annual services for crops,disasters,yield predictions,and agrometeorological resources. The service system works on windows NT server. It is easy to run on Internet using Netscape or Explorer.
Based on a great deal of historical data of agriculture and meteorology,a service system was developed to offer annual services for crops,disasters,yield predictions,and agrometeorological resources. The service system works on windows NT server. It is easy to run on Internet using Netscape or Explorer.
1998, 24(8):21-25.
DOI: 10.7519/j.issn.1000-0526.1998.8.005
Abstract:
The growing vigor of winter wheat is seriously affected by different topography,geomorphology and climate ecological conditions,and the monitoring accuracy of remote sensing is also limited by them. Based on the influence analysis of different topographical and climate ecological conditions to wheat growing vigor,NOAA/AVHRR data and topography map,soil map,year rainfall map,mean yearly temperature map,administrative area map etc. were integrated and the monitoring region was divided into several layers by means of the methods of scanning,data format transiting and database creating etc. based on EPPL7 GIS tools. The monitoring indexes of wheat growing vigor within different layers were acquired by systematic observed data and random investigating data. The mean monitoring accuracy of 8% was improved by excluding non wheat cells and distinguishing layers. The basic integrating application of GIS and RS was realized with some connection software.
The growing vigor of winter wheat is seriously affected by different topography,geomorphology and climate ecological conditions,and the monitoring accuracy of remote sensing is also limited by them. Based on the influence analysis of different topographical and climate ecological conditions to wheat growing vigor,NOAA/AVHRR data and topography map,soil map,year rainfall map,mean yearly temperature map,administrative area map etc. were integrated and the monitoring region was divided into several layers by means of the methods of scanning,data format transiting and database creating etc. based on EPPL7 GIS tools. The monitoring indexes of wheat growing vigor within different layers were acquired by systematic observed data and random investigating data. The mean monitoring accuracy of 8% was improved by excluding non wheat cells and distinguishing layers. The basic integrating application of GIS and RS was realized with some connection software.
6 The Analysis of Noise Level about VIS Channels on Spin Span Radiometer of FY2 Meteorology Satellite
1998, 24(8):26-28.
DOI: 10.7519/j.issn.1000-0526.1998.8.006
Abstract:
In order to analyze the noise level of FY2 VISSR VIS channels using the space areas data on FY2 VIS full Earth disk imagery,space structure function analysis was used. The results show that the noise level of FY2 VISSR VIS channels are not the same,the equivalent noise level of CH1 is 0.51,and the equivalent noise level of the other channels are from 0.42 to 0.45.
In order to analyze the noise level of FY2 VISSR VIS channels using the space areas data on FY2 VIS full Earth disk imagery,space structure function analysis was used. The results show that the noise level of FY2 VISSR VIS channels are not the same,the equivalent noise level of CH1 is 0.51,and the equivalent noise level of the other channels are from 0.42 to 0.45.
1998, 24(8):29-32.
DOI: 10.7519/j.issn.1000-0526.1998.08.007
Abstract:
Soil moisture of different layers was measured by improved L520 Neutronscope made in China and calibrated with polinomial regression method. The results show that measurments with new instrument and curve calibration method are much more accurate than that of the old LNW 50C Neutronscope and the linear calibration method.
Soil moisture of different layers was measured by improved L520 Neutronscope made in China and calibrated with polinomial regression method. The results show that measurments with new instrument and curve calibration method are much more accurate than that of the old LNW 50C Neutronscope and the linear calibration method.
1998, 24(8):32-37.
DOI: 10.7519/j.issn.1000-0526.1998.8.008
Abstract:
Based on the objective analyses of real time echo data of weather radar,the echo intensity gradient was defined,and the correction to the feature of radar echo attenuation with distance was given to make the detecting data more actual. A lot of weather physical factors were selected and calculated,combining with a routine mathematic statistics model,the 0～2 hour precipitation forecasting model was developed. Thus,the super short term quantitative rainstorm prediction was given.
Based on the objective analyses of real time echo data of weather radar,the echo intensity gradient was defined,and the correction to the feature of radar echo attenuation with distance was given to make the detecting data more actual. A lot of weather physical factors were selected and calculated,combining with a routine mathematic statistics model,the 0～2 hour precipitation forecasting model was developed. Thus,the super short term quantitative rainstorm prediction was given.
1998, 24(8):37-41.
DOI: 10.7519/j.issn.1000-0526.1998.08.009
Abstract:
The characteristics of the hail weather over four cities at the northeast of Yimeng mountain in Shandong province were analysed. 4 major weather conditions of hail occurrence and 5 major hail cloud moving trace were presented. The result showed when the hail weather occured was most frequent in May and June. Therefore,a serial of short range forecast equations for May and June were established,and a short range criteria for distinguishing hail cloud and thunder rain cloud was suggested by using radar sounding.
The characteristics of the hail weather over four cities at the northeast of Yimeng mountain in Shandong province were analysed. 4 major weather conditions of hail occurrence and 5 major hail cloud moving trace were presented. The result showed when the hail weather occured was most frequent in May and June. Therefore,a serial of short range forecast equations for May and June were established,and a short range criteria for distinguishing hail cloud and thunder rain cloud was suggested by using radar sounding.
1998, 24(8):42-43.
DOI: 10.7519/j.issn.1000-0526.1998.08.010
Abstract:
The heights of thermal internal boundary layer at three observation sites are calculated for the east coast of Liao Dong bay,and the comparison are made between observation and calculation with experiential formula.
The heights of thermal internal boundary layer at three observation sites are calculated for the east coast of Liao Dong bay,and the comparison are made between observation and calculation with experiential formula.
1998, 24(8):44-49.
DOI: 10.7519/j.issn.1000-0526.1998.8.011
Abstract:
There was a very obvious high temperature phenomenon in North China in the summer of 1997. Its characteristics and temporal spatial distribution of high temperature in that summer were analyzed. Besides,contrasted analysis with historical data and the relationship with El Nio were also discussed in order to understand the feature of high tempreature in the summer of 1997 in detail.
There was a very obvious high temperature phenomenon in North China in the summer of 1997. Its characteristics and temporal spatial distribution of high temperature in that summer were analyzed. Besides,contrasted analysis with historical data and the relationship with El Nio were also discussed in order to understand the feature of high tempreature in the summer of 1997 in detail.
1998, 24(8):50-56.
DOI: 10.7519/j.issn.1000-0526.1998.08.012
Abstract:
The details of the cause of the early summer severe drought disaster in Yunnan Province in 1997 was diagnosed from two sides of general atmospheric circuclation and air sea interaction. As for the amount of early summer precipitation in Yunnan Province,a comprehensive forecast scheme which considers to combine physical diagnosis with statistical forecast was presented,the method has a reference value to make climate forecast in the area.
The details of the cause of the early summer severe drought disaster in Yunnan Province in 1997 was diagnosed from two sides of general atmospheric circuclation and air sea interaction. As for the amount of early summer precipitation in Yunnan Province,a comprehensive forecast scheme which considers to combine physical diagnosis with statistical forecast was presented,the method has a reference value to make climate forecast in the area.
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