ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 27,Issue 7,2001 Table of Contents
2001, 27(7):3-7.
DOI: 10.7519/j.issn.1000-0526.2001.07.001
Abstract:
According to the data of air temperature for nearly 40 years(1961—1999) at 20 weather stations around open trench of desert in hydraulic engineering of diverting water of Erqisi river into Urumqi and other data (longgitude,latitude and height above sea level), and applying ways of climatology,geography,hydraulic engineering and entropy meteorology, models of mean air temperature (April and July) , annual mean air temperature and stable period of water transmission in the open trench of 170km are built, meanwhile, by means of probability models of normal distribution , design value are obtained, so the distribution laws of these circumstances are disclosed.
According to the data of air temperature for nearly 40 years(1961—1999) at 20 weather stations around open trench of desert in hydraulic engineering of diverting water of Erqisi river into Urumqi and other data (longgitude,latitude and height above sea level), and applying ways of climatology,geography,hydraulic engineering and entropy meteorology, models of mean air temperature (April and July) , annual mean air temperature and stable period of water transmission in the open trench of 170km are built, meanwhile, by means of probability models of normal distribution , design value are obtained, so the distribution laws of these circumstances are disclosed.
2001, 27(7):8-12.
DOI: 10.7519/j.issn.1000-0526.2001.7.002
Abstract:
The initial fields and output of Mesoscale Numerical Prediction System in Northeast China were verified by means of WMO's standard verification method because there were some failures in the operational prediction There are two kinds of initial fields and output, one is that the initial fields were created by output of medium-range forecast model (T106L19) used as initial first guess fields and were corrected by sounding data set, called T106 The other is of the objectively analyzing fields of sounding data set, called OBS The results of verification as the follows: (1) T106 is better than OBS in the elements that represents synoptic scale, such as 300hPa's wind and 500hPa's height (2) OBS is better in the elements that represents mesoscale, such as 850hPa's temperature and humidity The output at the low level are more precious than that at the high level (3) The predicted winds at the high level are better, but there are some prediction errors in U and V component field At one time, TS skill scores of precipitation were calculated for two kinds of output These results indicate that TS score of T106 is higher than OBS's in general, but there are more rain of prediction with T106 initial fields with OBS's initial fields than observation rains.
The initial fields and output of Mesoscale Numerical Prediction System in Northeast China were verified by means of WMO's standard verification method because there were some failures in the operational prediction There are two kinds of initial fields and output, one is that the initial fields were created by output of medium-range forecast model (T106L19) used as initial first guess fields and were corrected by sounding data set, called T106 The other is of the objectively analyzing fields of sounding data set, called OBS The results of verification as the follows: (1) T106 is better than OBS in the elements that represents synoptic scale, such as 300hPa's wind and 500hPa's height (2) OBS is better in the elements that represents mesoscale, such as 850hPa's temperature and humidity The output at the low level are more precious than that at the high level (3) The predicted winds at the high level are better, but there are some prediction errors in U and V component field At one time, TS skill scores of precipitation were calculated for two kinds of output These results indicate that TS score of T106 is higher than OBS's in general, but there are more rain of prediction with T106 initial fields with OBS's initial fields than observation rains.
2001, 27(7):13-15.
DOI: 10.7519/j.issn.1000-0526.2001.7.003
Abstract:
3824-C full phase pulse Doppler weather radar velocity images are studied with Doppler weather radar observation during the period of 1995—1999. Adverse wind regions in Beijing area can be a heavy rain nowcasting recognition signature. The design and implement of an interactive recognition utility are given.
3824-C full phase pulse Doppler weather radar velocity images are studied with Doppler weather radar observation during the period of 1995—1999. Adverse wind regions in Beijing area can be a heavy rain nowcasting recognition signature. The design and implement of an interactive recognition utility are given.
2001, 27(7):16-19.
DOI: 10.7519/j.issn.1000-0526.2001.7.004
Abstract:
Based on the analysis of fog continued time forecasting results calculated by interpretation equations obtained with PPM technique, a large number of forecasting factors constructed by output products of numerical prediction and related to fog maintenance are designed and then analyzed by a step-wise regression method in order to found a set of MOS ( interpretation) equations for prediction of fog continued time.Finally, an integrated forecasting scheme is established for operational use A comparison between forecasting results by PPM interpretation equations and those by MOS integrated forecasting scheme shows that the forecasting performance is improved obviously by the latter
Based on the analysis of fog continued time forecasting results calculated by interpretation equations obtained with PPM technique, a large number of forecasting factors constructed by output products of numerical prediction and related to fog maintenance are designed and then analyzed by a step-wise regression method in order to found a set of MOS ( interpretation) equations for prediction of fog continued time.Finally, an integrated forecasting scheme is established for operational use A comparison between forecasting results by PPM interpretation equations and those by MOS integrated forecasting scheme shows that the forecasting performance is improved obviously by the latter
2001, 27(7):20-23.
DOI: 10.7519/j.issn.1000-0526.2001.7.005
Abstract:
Macro- and micro physics conditions of supercooled fog dissipation operation using liquid Nitrogen with that of the cold cloud seeding are compared. For filling a gap of data after seeding by airplane, physical responses is elicited after seeding in cold clouds based on those that occurred in fog dissipation operation and then the effect of enhancement precipitation is discussed.
Macro- and micro physics conditions of supercooled fog dissipation operation using liquid Nitrogen with that of the cold cloud seeding are compared. For filling a gap of data after seeding by airplane, physical responses is elicited after seeding in cold clouds based on those that occurred in fog dissipation operation and then the effect of enhancement precipitation is discussed.
2001, 27(7):24-26.
DOI: 10.7519/j.issn.1000-0526.2001.7.006
Abstract:
According to the basic principle of microwave measurement and with the present instruments at radar stations,a practicable method of measuring insertion loss in radar transmission line is presented.Some points are put forward and some results obtained with 713C radar are reported.
According to the basic principle of microwave measurement and with the present instruments at radar stations,a practicable method of measuring insertion loss in radar transmission line is presented.Some points are put forward and some results obtained with 713C radar are reported.
2001, 27(7):27-29.
DOI: 10.7519/j.issn.1000-0526.2001.7.007
Abstract:
In early September 1999,a tropical storm(WENDY)landed,moved northeast,then interacted with the trough in mid latitudes and finally, produced tornado in the southeastern Shanghai. Combined satellite cloud pictures with physical quantities, it is found that interaction of systems between middle and low latitude made WENDY inverted trough maintenance and development, also play an important role for WENDY moving to north. When WENDY connected with westerly system , good environment of higher level divergence and lower level convergence strengthened the development of convective cloud. East moving of the mesoscale dry surge intensified the horizontal wind shear, at last caused the tornado.
In early September 1999,a tropical storm(WENDY)landed,moved northeast,then interacted with the trough in mid latitudes and finally, produced tornado in the southeastern Shanghai. Combined satellite cloud pictures with physical quantities, it is found that interaction of systems between middle and low latitude made WENDY inverted trough maintenance and development, also play an important role for WENDY moving to north. When WENDY connected with westerly system , good environment of higher level divergence and lower level convergence strengthened the development of convective cloud. East moving of the mesoscale dry surge intensified the horizontal wind shear, at last caused the tornado.
8 Analysis and Medium-Range Forecast for Mei-yu Events over the Changjiang-Huaihe River Basin in 2000
2001, 27(7):30-34.
DOI: 10.7519/j.issn.1000-0526.2001.7.008
Abstract:
The circulation features during the 2000 Jianghuai mei-yu period suggested that at the beginning of mei-yu event,the seasonal northward moving of the 120°E ridge of western Pacific subtropical high has a evident 2-week oscillation period;both the northward moving to 25°N of the ridge of South Asia high and the onset of Indian monsoon -the end of stable Calcutta westerly obviously foretell the beginning of Jianghuai mei-yu. At the end of mei yu period,the continuous northward moving to 47 5°N of the geostrophic wind jet axis of Asia region during the meiyu season,regulation of stable ultra-long wave ridge of 50°N superposing wave was earlier than that of western Pacific subtropical high and the northward moving of typhoon 0003 occurred in the eastern ocean surface of Philippine in the late period of mei yu season significantly contributed to the circulation regulation of the end of mei-yu.
The circulation features during the 2000 Jianghuai mei-yu period suggested that at the beginning of mei-yu event,the seasonal northward moving of the 120°E ridge of western Pacific subtropical high has a evident 2-week oscillation period;both the northward moving to 25°N of the ridge of South Asia high and the onset of Indian monsoon -the end of stable Calcutta westerly obviously foretell the beginning of Jianghuai mei-yu. At the end of mei yu period,the continuous northward moving to 47 5°N of the geostrophic wind jet axis of Asia region during the meiyu season,regulation of stable ultra-long wave ridge of 50°N superposing wave was earlier than that of western Pacific subtropical high and the northward moving of typhoon 0003 occurred in the eastern ocean surface of Philippine in the late period of mei yu season significantly contributed to the circulation regulation of the end of mei-yu.
2001, 27(7):35-40.
DOI: 10.7519/j.issn.1000-0526.2001.7.009
Abstract:
With GMS TBB data and the moist available energy method, an analysis of the nine hail fallout processes in Bameng area on 1998 is made. It suggests: (1) the temperature of cloud top and its horizontal gradient were important parameters for identification of hail cloud; (2) as hail cloud genesis there was a tongue of high energy at the low level and a center of low energy at the mid and upper level while a center of negative energy advection was located over its north and northwest.
With GMS TBB data and the moist available energy method, an analysis of the nine hail fallout processes in Bameng area on 1998 is made. It suggests: (1) the temperature of cloud top and its horizontal gradient were important parameters for identification of hail cloud; (2) as hail cloud genesis there was a tongue of high energy at the low level and a center of low energy at the mid and upper level while a center of negative energy advection was located over its north and northwest.
2001, 27(7):41-44.
DOI: 10.7519/j.issn.1000-0526.2001.7.010
Abstract:
With the observation data of Doppler Radar at Xiamen,the intensity of radar echo and Doppler velocity,as well as their variation were analyzed,focused on the data when typhoon 9914 was approaching and landing on Xiamen.The results showed that Doppler radar is superior in monitoring typhoon to general one.
With the observation data of Doppler Radar at Xiamen,the intensity of radar echo and Doppler velocity,as well as their variation were analyzed,focused on the data when typhoon 9914 was approaching and landing on Xiamen.The results showed that Doppler radar is superior in monitoring typhoon to general one.
2001, 27(7):45-48.
DOI: 10.7519/j.issn.1000-0526.2001.7.011
Abstract:
The development and applications of a graphic software for MS Windows98 are introduced,including the design and applications of such moduluses as the generation of graphics data files, drawing of contour and the making of color region graphs, trend statistics graphs and multi-elemental dots graphs.
The development and applications of a graphic software for MS Windows98 are introduced,including the design and applications of such moduluses as the generation of graphics data files, drawing of contour and the making of color region graphs, trend statistics graphs and multi-elemental dots graphs.
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ISSN:1000-0526 CN:11-2282/P