ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Volume 29,Issue 6,2003 Table of Contents
2003, 29(6):3-6.
DOI: 10.7519/j.issn.1000-0526.2003.6.001
Abstract:
The influence of spring Arctic Oscillation (AO) on the summer rainfall over Meiyu—Changma—Baiu regions is analyzed.Here the precipitation observations for period 1899—1999 for ten stations located in these regions are employed.Results show that on the interannual time scale,the correlation between 10-station-mean precipitation and May AO is -0 45,significant at 99% confidence level.There are about 8% decrease of summer rainfall in association with a one standard deviation stronger AO,and vice versa.The responsible atmospheric circulation displays a north shift of the jet stream.It is also found that the larger anomalies of AO are usually followed by more significant variations of rainfall;whereas,the relations are not evident in the small-AO-anomaly conditions.This is helpful for East Asian summer rainfall prediction.
The influence of spring Arctic Oscillation (AO) on the summer rainfall over Meiyu—Changma—Baiu regions is analyzed.Here the precipitation observations for period 1899—1999 for ten stations located in these regions are employed.Results show that on the interannual time scale,the correlation between 10-station-mean precipitation and May AO is -0 45,significant at 99% confidence level.There are about 8% decrease of summer rainfall in association with a one standard deviation stronger AO,and vice versa.The responsible atmospheric circulation displays a north shift of the jet stream.It is also found that the larger anomalies of AO are usually followed by more significant variations of rainfall;whereas,the relations are not evident in the small-AO-anomaly conditions.This is helpful for East Asian summer rainfall prediction.
2003, 29(6):7-11.
DOI: 10.7519/j.issn.1000-0526.2003.06.002
Abstract:
The day-to-day change indexes of the western Pacific subtropical high (STH) at 500hPa from June to July of 1998 and 2001 over the Changjiang River valley are calculated. The atmospheric circulation field of the northern Hemisphere and the daily variation features of STH in the Changjiang River valley during plum rains season are comparatively analyzed. The result shows that the flood/drought in the Changjiang River valley during plum rains season is closely related with the STH intensity and east/ west location. It is also found that the strong precipitation in the Changjiang River valley uneasily occurs not only when STH is weak and its location is eastward of the mean for a long time, but also it connects with Iran high and anomaly westward of the mean. But the strong precipitation in the Changjiang River valley easily occurs when STH′s mean ridge line is located by the south and its west-end in 95～115°E.
The day-to-day change indexes of the western Pacific subtropical high (STH) at 500hPa from June to July of 1998 and 2001 over the Changjiang River valley are calculated. The atmospheric circulation field of the northern Hemisphere and the daily variation features of STH in the Changjiang River valley during plum rains season are comparatively analyzed. The result shows that the flood/drought in the Changjiang River valley during plum rains season is closely related with the STH intensity and east/ west location. It is also found that the strong precipitation in the Changjiang River valley uneasily occurs not only when STH is weak and its location is eastward of the mean for a long time, but also it connects with Iran high and anomaly westward of the mean. But the strong precipitation in the Changjiang River valley easily occurs when STH′s mean ridge line is located by the south and its west-end in 95～115°E.
2003, 29(6):12-15.
DOI: 10.7519/j.issn.1000-0526.2003.6.003
Abstract:
Based on the rainfall data of Qingzhou, Shandong Province,from 1980 to 1999, the Macro-character and variation tendency of precipitation from April to September are mainly investigated. The contributions of different weather systems to rainfall are calculated, the relationship between the rainfall and the characters of the spatial and temporal distributions of rain clouds is analyzed. Then, the rainfall differences in urban, mountainous and plain areas are also studied. The results show more rainfall were observed from 1990 to 1999 than that from1980 to 1989. The main reason is the increase of convective rainfall due to cyclone activities. The regional precipitation differences show that the urban area has more rainfall than the mountainous area. The rainfall in the mountainous area is more than that in the plain area.
Based on the rainfall data of Qingzhou, Shandong Province,from 1980 to 1999, the Macro-character and variation tendency of precipitation from April to September are mainly investigated. The contributions of different weather systems to rainfall are calculated, the relationship between the rainfall and the characters of the spatial and temporal distributions of rain clouds is analyzed. Then, the rainfall differences in urban, mountainous and plain areas are also studied. The results show more rainfall were observed from 1990 to 1999 than that from1980 to 1989. The main reason is the increase of convective rainfall due to cyclone activities. The regional precipitation differences show that the urban area has more rainfall than the mountainous area. The rainfall in the mountainous area is more than that in the plain area.
2003, 29(6):16-21.
DOI: 10.7519/j.issn.1000-0526.2003.6.004
Abstract:
"Geostationary Satellite Images Processing System" can process the VIS, IR and WV images of GMS-5 of Japan, which runs on Windows operating system of microsoft and has standard graphic interface. It is very convenient and flexible for users and it can help them finishing research work quickly. Its main functions are as follows: Overlay satellite image with map and longitude-latitude grid, extracting TBB grid files, averaging satellite images, enhancing satellite images, conversion of satellite images to common graphic and image file.
"Geostationary Satellite Images Processing System" can process the VIS, IR and WV images of GMS-5 of Japan, which runs on Windows operating system of microsoft and has standard graphic interface. It is very convenient and flexible for users and it can help them finishing research work quickly. Its main functions are as follows: Overlay satellite image with map and longitude-latitude grid, extracting TBB grid files, averaging satellite images, enhancing satellite images, conversion of satellite images to common graphic and image file.
2003, 29(6):22-25.
DOI: 10.7519/j.issn.1000-0526.2003.6.005
Abstract:
Base on the statistical analysis of upper maximal wind in dry season at Xichang Launch Site(XLS),its relationship of general circulation with the synoptic system is analyzed. According to the result,the forecasting method of upper maximal wind is discussed.Forthermore,the effective predictive indicators are developed.
Base on the statistical analysis of upper maximal wind in dry season at Xichang Launch Site(XLS),its relationship of general circulation with the synoptic system is analyzed. According to the result,the forecasting method of upper maximal wind is discussed.Forthermore,the effective predictive indicators are developed.
2003, 29(6):26-29.
DOI: 10.7519/j.issn.1000-0526.2003.6.006
Abstract:
The developing situation of GPS Meteorology and a brief account of the GPS Meteorological Network in Yangtze River Delta Area is introduced. It is emphasized that how to achieve the near-real time running of the GPS meteorological network through overcoming the problems including the calculation method and necessary additional equipment, the communication system, the product real-time demonstration system and the quasi-operational management.
The developing situation of GPS Meteorology and a brief account of the GPS Meteorological Network in Yangtze River Delta Area is introduced. It is emphasized that how to achieve the near-real time running of the GPS meteorological network through overcoming the problems including the calculation method and necessary additional equipment, the communication system, the product real-time demonstration system and the quasi-operational management.
2003, 29(6):30-32.
DOI: 10.7519/j.issn.1000-0526.2003.6.007
Abstract:
Based on obtaining the original data of radar′s barricaded object from the geographical information system, and combining with the software for analyzing objectively the visibility of alternative Doppler weather radar site, the work of Doppler weather radar site is better and faster.
Based on obtaining the original data of radar′s barricaded object from the geographical information system, and combining with the software for analyzing objectively the visibility of alternative Doppler weather radar site, the work of Doppler weather radar site is better and faster.
2003, 29(6):33-36.
DOI: 10.7519/j.issn.1000-0526.2003.6.008
Abstract:
Through widely browsing, investigating and analyzing internet development and meteorological service webs at home and abroad, the effects of internet(its form and technique) on meteorological information organizing and issuing are obtaind. Furthermore,by research and practice, the measures to respond these effects, and some theory and practical experiences for expanding meteorological service field are provided.
Through widely browsing, investigating and analyzing internet development and meteorological service webs at home and abroad, the effects of internet(its form and technique) on meteorological information organizing and issuing are obtaind. Furthermore,by research and practice, the measures to respond these effects, and some theory and practical experiences for expanding meteorological service field are provided.
2003, 29(6):37-40.
DOI: 10.7519/j.issn.1000-0526.2003.6.009
Abstract:
Based on the observation of 90 stations in Xinjiang, the spatial and temporal distribution character of sandstorm is analyzed. Corresponding the strong wind data, the monthly rainfall and temperature data, and relative humidity data, the effect of these four kinds climatic factors on sandstorms is researched.
Based on the observation of 90 stations in Xinjiang, the spatial and temporal distribution character of sandstorm is analyzed. Corresponding the strong wind data, the monthly rainfall and temperature data, and relative humidity data, the effect of these four kinds climatic factors on sandstorms is researched.
2003, 29(6):41-45.
DOI: 10.7519/j.issn.1000-0526.2003.6.010
Abstract:
The errors of 24 hour and 48 hour area rainfall forecast of Tianjin Meteorological Observatory and Hebei Meteorological Observatory in the Haihe river basin from July to August 2002 are analyzed. Based on fuzzy comprehensive judgment method, the two observatories′ fuzzy grades are calculated. The results show that area rainfall forecasts in the Haihe river basin have much more reliability, which are much more useful as a initial values of hydrologic model. The results also show that in the observatories′ forecast regions, the less the area, the higher the forecast accuracy, and the number 80% (or 80) is an objective and believable value for evaluating the forecast effects of area rainfall.
The errors of 24 hour and 48 hour area rainfall forecast of Tianjin Meteorological Observatory and Hebei Meteorological Observatory in the Haihe river basin from July to August 2002 are analyzed. Based on fuzzy comprehensive judgment method, the two observatories′ fuzzy grades are calculated. The results show that area rainfall forecasts in the Haihe river basin have much more reliability, which are much more useful as a initial values of hydrologic model. The results also show that in the observatories′ forecast regions, the less the area, the higher the forecast accuracy, and the number 80% (or 80) is an objective and believable value for evaluating the forecast effects of area rainfall.
2003, 29(6):46-49.
DOI: 10.7519/j.issn.1000-0526.2003.6.011
Abstract:
Based on Synoptic situation, and characteristics, satellite image, weather radar echoes , weather mechanism heavy sand devil of May 11,2001 in Urmuqi International Airport are analyzed. It is shown that this weather is triggered by the convective cloud cluster in front of the cold front, and this cluster has the character of the super thunderstorm cell.
Based on Synoptic situation, and characteristics, satellite image, weather radar echoes , weather mechanism heavy sand devil of May 11,2001 in Urmuqi International Airport are analyzed. It is shown that this weather is triggered by the convective cloud cluster in front of the cold front, and this cluster has the character of the super thunderstorm cell.
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ISSN:1000-0526 CN:11-2282/P