ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 29,Issue 11,2003 Table of Contents
2003, 29(11):3-7.
DOI: 10.7519/j.issn.1000-0526.2003.11.001
Abstract:
An introduction to weather forecast technology research for guidance and an operational system of weather forecast in Shandong province are given. TS-scores of general elements, hail and heavy rain prediction contrast test are also presented.
An introduction to weather forecast technology research for guidance and an operational system of weather forecast in Shandong province are given. TS-scores of general elements, hail and heavy rain prediction contrast test are also presented.
2003, 29(11):8-13.
DOI: 10.7519/j.issn.1000-0526.2003.11.002
Abstract:
After a brief introduction of Shanghai mesoscale numerical weather forecast system, a real time forecast result of a heavy rain in East China during 29/05/2002 to 30/05/2002 is analyzed with output of this forecast system. The macro scale stream field and simulation result are analyzed and the main causes of the event are discussed. Furthermore, the predictands in correlative single stations are discussed. The results proved that the Shanghai mesoscale numerical weather forecast system has the ability at a certain extent in operation, and is worth of reference to forecasters.
After a brief introduction of Shanghai mesoscale numerical weather forecast system, a real time forecast result of a heavy rain in East China during 29/05/2002 to 30/05/2002 is analyzed with output of this forecast system. The macro scale stream field and simulation result are analyzed and the main causes of the event are discussed. Furthermore, the predictands in correlative single stations are discussed. The results proved that the Shanghai mesoscale numerical weather forecast system has the ability at a certain extent in operation, and is worth of reference to forecasters.
2003, 29(11):14-19.
DOI: 10.7519/j.issn.1000-0526.2003.11.003
Abstract:
With intensive detecting data, the observational characteristics of meso-scale weather system triggering heavy rainfall over the middle valleys of Changjiang River is analyzed. The Results show that the interaction of multi scale synoptic systems leads to heavy rainfall, and several β scale convective systems moving along α-scale shear directly result in heavy rainfall. Several meso scale heavy rainfall masses come into being with the forming and developing of convective system and move along the active route of the convective system. The physical image of the β scale convective system can be described as follows. Air flow in the northeast and southwest of the shear converged into the shear and ascend and joined into the convective system, then the air current rose in the foreside of (or along) the θse front and rotated clockwise with a height under the effect of warn advection and diverge as southwest air flow at the height of 7km and subside at the range of 400～500km, and lastly a meso scale vertical circulation formed by the θse front with convective cloud in the ascending branch of the circulation.
With intensive detecting data, the observational characteristics of meso-scale weather system triggering heavy rainfall over the middle valleys of Changjiang River is analyzed. The Results show that the interaction of multi scale synoptic systems leads to heavy rainfall, and several β scale convective systems moving along α-scale shear directly result in heavy rainfall. Several meso scale heavy rainfall masses come into being with the forming and developing of convective system and move along the active route of the convective system. The physical image of the β scale convective system can be described as follows. Air flow in the northeast and southwest of the shear converged into the shear and ascend and joined into the convective system, then the air current rose in the foreside of (or along) the θse front and rotated clockwise with a height under the effect of warn advection and diverge as southwest air flow at the height of 7km and subside at the range of 400～500km, and lastly a meso scale vertical circulation formed by the θse front with convective cloud in the ascending branch of the circulation.
2003, 29(11):20-24.
DOI: 10.7519/j.issn.1000-0526.2003.11.004
Abstract:
Sea breeze fronts always form in the coastal northern Weifang, Shandong Province. The superposition of the sea breeze fronts and mesosystem could make the system stronger. This is an important reason that in northern Shandong province severe convection appears frequently. An analysis of a cold front process indicates that the superposition is conductive to form a stronger wind area. The D,ζ over the front could accelerate the upward vertical movement. The relevant high energy areas near the surface provided the energy. A nowcasting equation of the track is developed by analyzing 21 severe convection events.
Sea breeze fronts always form in the coastal northern Weifang, Shandong Province. The superposition of the sea breeze fronts and mesosystem could make the system stronger. This is an important reason that in northern Shandong province severe convection appears frequently. An analysis of a cold front process indicates that the superposition is conductive to form a stronger wind area. The D,ζ over the front could accelerate the upward vertical movement. The relevant high energy areas near the surface provided the energy. A nowcasting equation of the track is developed by analyzing 21 severe convection events.
2003, 29(11):25-28.
DOI: 10.7519/j.issn.1000-0526.2003.11.005
Abstract:
The spatial temporal distribution of hail is analyzed based on the hail data from 1961 to 1999 at 90 weather stations in Xinjiang. The hail occurrence is more frequent in mountainous areas in the western and middle part of Xinjiang and concentrates in the period from April to October, and in most of the days in June. More hail occurs in afternoon and most in evening. The persistence time of most hail is within 6 minutes. The local hail (1279) was more than systematic hail (76) during 1961 to 1999. Hail weather processes were closely related to topography, mainly occurred in mountainous area. Hail weather mostly appeared only 1 day, mainly in summer. Systematic hail weather was caused by mesoscale high pressure.
The spatial temporal distribution of hail is analyzed based on the hail data from 1961 to 1999 at 90 weather stations in Xinjiang. The hail occurrence is more frequent in mountainous areas in the western and middle part of Xinjiang and concentrates in the period from April to October, and in most of the days in June. More hail occurs in afternoon and most in evening. The persistence time of most hail is within 6 minutes. The local hail (1279) was more than systematic hail (76) during 1961 to 1999. Hail weather processes were closely related to topography, mainly occurred in mountainous area. Hail weather mostly appeared only 1 day, mainly in summer. Systematic hail weather was caused by mesoscale high pressure.
2003, 29(11):29-32.
DOI: 10.7519/j.issn.1000-0526.2003.11.006
Abstract:
Based on large scale circulation, satellite images, geostrophic steering flow and moist thermal wind, the reasons of rapid accelerated motion for severe tropical storm Vongfong (0214) are analyzed. The results show that the change of large scale circulation, the strengthening of steering flow and the change of tropical storm cloud are the possible reasons of rapid accelerated motion for Vongfong.
Based on large scale circulation, satellite images, geostrophic steering flow and moist thermal wind, the reasons of rapid accelerated motion for severe tropical storm Vongfong (0214) are analyzed. The results show that the change of large scale circulation, the strengthening of steering flow and the change of tropical storm cloud are the possible reasons of rapid accelerated motion for Vongfong.
2003, 29(11):33-35.
DOI: 10.7519/j.issn.1000-0526.2003.11.007
Abstract:
Based on the satellite imagery and Meteorological Observation, a mesoscale vortex over North China on 17 July 2002 is analyzed. The results show that (1) The Vortex formed in weak baroclinic front zone, and caused by the interaction of muti scale disturbance of mutil cells. (2) The vortex was a shallow system, there was only a convergence area in 850hPa. (3) Without external vapour resource, the vortex weather was mainly high wind and hail. The energy released while it accumulated during the formation of vortex.
Based on the satellite imagery and Meteorological Observation, a mesoscale vortex over North China on 17 July 2002 is analyzed. The results show that (1) The Vortex formed in weak baroclinic front zone, and caused by the interaction of muti scale disturbance of mutil cells. (2) The vortex was a shallow system, there was only a convergence area in 850hPa. (3) Without external vapour resource, the vortex weather was mainly high wind and hail. The energy released while it accumulated during the formation of vortex.
2003, 29(11):36-40.
DOI: 10.7519/j.issn.1000-0526.2003.11.008
Abstract:
The mathematical description of low visibility over highways is intruduced. It proves the necessity of monitoring and forecasting of low visibility on the basis of the theory of phase change and the actual sudden change of visibility and the braking distance requirement. The monitoring and forecasting system of low visibility that has been used on the Shanghai-Nanjing highway in Wuxi for more than a year are discribed. Some examples are given to show that this system can forecast the heavy fog, including the regional fog and the sudden fog so that serious traffic accidents can be lessened or avoided.
The mathematical description of low visibility over highways is intruduced. It proves the necessity of monitoring and forecasting of low visibility on the basis of the theory of phase change and the actual sudden change of visibility and the braking distance requirement. The monitoring and forecasting system of low visibility that has been used on the Shanghai-Nanjing highway in Wuxi for more than a year are discribed. Some examples are given to show that this system can forecast the heavy fog, including the regional fog and the sudden fog so that serious traffic accidents can be lessened or avoided.
2003, 29(11):41-44.
DOI: 10.7519/j.issn.1000-0526.2003.11.009
Abstract:
In order to learn the effect of the numerical forecast production of heavy rain forecast, the application of surface and acro situation and rainfall forecast production of the weather models used in EC,Washington,Japan,the Weather online Website of the Central Observatory and Germany in some cases of heavy rain are studied.And the results show that the numerical forecast production had an important effect both on medium term forecast and short term forecast in Hunan Province in 2002.
In order to learn the effect of the numerical forecast production of heavy rain forecast, the application of surface and acro situation and rainfall forecast production of the weather models used in EC,Washington,Japan,the Weather online Website of the Central Observatory and Germany in some cases of heavy rain are studied.And the results show that the numerical forecast production had an important effect both on medium term forecast and short term forecast in Hunan Province in 2002.
2003, 29(11):45-48.
DOI: 10.7519/j.issn.1000-0526.2003.11.010
Abstract:
An objective and high resolution and full digital and real time monitoring meteorological 3S system, which provides the functions of GPS, RS and GIS data real time collecting, rectifying, retrieving, multi sources space data synthesis analyzing and dynamically monitoring, is developed for agricultural region division, agricultural economic adjustment and ecological environment construction supported by RS, GIS and GPS technology. The transformation from the traditional qualitative, individual spot and static analyzing of Ningxia climate, land resource and remote sensing information into the quantificational, positioning and dynamically precised evaluating is achieved, and the goal of reasonable exploitation, the balanced use and the sustainable development of Ningxia basic resource is primarily realized.
An objective and high resolution and full digital and real time monitoring meteorological 3S system, which provides the functions of GPS, RS and GIS data real time collecting, rectifying, retrieving, multi sources space data synthesis analyzing and dynamically monitoring, is developed for agricultural region division, agricultural economic adjustment and ecological environment construction supported by RS, GIS and GPS technology. The transformation from the traditional qualitative, individual spot and static analyzing of Ningxia climate, land resource and remote sensing information into the quantificational, positioning and dynamically precised evaluating is achieved, and the goal of reasonable exploitation, the balanced use and the sustainable development of Ningxia basic resource is primarily realized.
2003, 29(11):49-51.
DOI: 10.7519/j.issn.1000-0526.2003.11.011
Abstract:
Ecological Environment Monitoring System of Qinghai Province is comprised of ecological environment monitoring network of all typical eco system area, remote sensing receiving and processing system, information collection, data processing, signal simulation, evaluation system, comprehensive information service and feedback system and so on. The aim of development of the system is to monitor and evaluate the ecological environment of Qinghai province, provide exact and overall information of ecological environment for development of the western China.
Ecological Environment Monitoring System of Qinghai Province is comprised of ecological environment monitoring network of all typical eco system area, remote sensing receiving and processing system, information collection, data processing, signal simulation, evaluation system, comprehensive information service and feedback system and so on. The aim of development of the system is to monitor and evaluate the ecological environment of Qinghai province, provide exact and overall information of ecological environment for development of the western China.
2003, 29(11):52-54.
DOI: 10.7519/j.issn.1000-0526.2003.11.012
Abstract:
Nearly all the cases of tropical cyclones influencing North China since 1949 are studied. Therefore, a detailed historical database of tropical cyclones influencing North China was set up. Some similar analysis, including tropical cyclone location, its forming season, the direction of movement, and the weather patterns were made and a similar forecasting system for short range and medium range on the working platform of MICAPS was developed.
Nearly all the cases of tropical cyclones influencing North China since 1949 are studied. Therefore, a detailed historical database of tropical cyclones influencing North China was set up. Some similar analysis, including tropical cyclone location, its forming season, the direction of movement, and the weather patterns were made and a similar forecasting system for short range and medium range on the working platform of MICAPS was developed.
2003, 29(11):55-57.
DOI: 10.7519/j.issn.1000-0526.2003.11.013
Abstract:
Based on the meteorological data such as temperature, precipitation, and humidity from 1961 to 1990, abundant tourism climate resources in the Three Gorge Reservoir Area are analyzed and estimated. The optimum tourist seasons are also provided according to the calculation of physical sensation index.
Based on the meteorological data such as temperature, precipitation, and humidity from 1961 to 1990, abundant tourism climate resources in the Three Gorge Reservoir Area are analyzed and estimated. The optimum tourist seasons are also provided according to the calculation of physical sensation index.
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ISSN:1000-0526 CN:11-2282/P