Hail is one of meteorological disasters affecting crop growth in Ulanqab City.It happens frequently from May to September,and this period is also the main growing season of crops.In this period,hail will cause damage ...Hail is one of meteorological disasters affecting crop growth in Ulanqab City.It happens frequently from May to September,and this period is also the main growing season of crops.In this period,hail will cause damage to crops,make farmland soil harden,and bring varying degrees of harm to agricultural production.Artificial hail suppression is an important scientific and technological means for disaster prevention and mitigation.It is necessary to strengthen the monitoring,analysis and forecast of severe convection weather,intensify the release of early warning information of hail weather,provide accurate and reliable real-time information for the implementation of artificial hail suppression operations,strengthen the implementation of artificial weather modification,effectively carry out artificial hail suppression operations,and avoid and reduce the impact of hail disaster.展开更多
Based on the conventional observation data and NCEP/NCAR reanalysis data,the circulation situation,influencing systems and causes of the heavy rain during September 20-21,2010 in Ulanqab City were analyzed from the ev...Based on the conventional observation data and NCEP/NCAR reanalysis data,the circulation situation,influencing systems and causes of the heavy rain during September 20-21,2010 in Ulanqab City were analyzed from the evolution process of weather circulation situation and the changes of various physical quantity fields.The results show that there was an obvious frontal zone between 45-52°N,which brought strong cold air.The transport of warm and humid air outside the subtropical high and typhoon was the main water vapor source of the strong precipitation,and the southwest jet at 700 hPa transported abundant water vapor.There was a broad inverted trough to the south of 45°N,with a central value of 1000.0 hPa.Ulanqab City was on the top of the inverted trough,stable and less moved,which was conducive to the occurrence of systematic heavy precipitation.The rainstorm was a strong precipitation process caused by the intersection of cold air brought by the southward movement of the upper frontal zone and warm and humid air outside the subtropical high.After the precipitation,the invasion of strong cold air brought frost and cold wave weather to Ulanqab City.展开更多
Based on the data of daily snowfall and weather phenomena of 11 national meteorological stations in Ulanqab City from 1991 to 2020,the spatial and temporal distribution characteristics of snowstorm were analyzed.The r...Based on the data of daily snowfall and weather phenomena of 11 national meteorological stations in Ulanqab City from 1991 to 2020,the spatial and temporal distribution characteristics of snowstorm were analyzed.The results show that the snowstorm in Ulanqab had obvious seasonal distribution characteristics,mainly happening in spring(March-May)and autumn(September-November).It also had obvious regional distribution in space,and the snowstorm center appeared in Chahar Right Wing Middle Banner and Jining District,namely the east side of the Yinshan Mountain.In the past 30 years,the amount of snowstorm in the whole year in Ulanqab showed a certain fluctuation trend,and the number of snowstorm days had shown an obvious upward trend since 2011.展开更多
The severe sandstorm process in Ulanqab,Inner Mongolia on March 15,2021 was analyzed and discussed from the aspects of weather facts,weather causes and dynamic diagnosis.The results show that the strong cold air in We...The severe sandstorm process in Ulanqab,Inner Mongolia on March 15,2021 was analyzed and discussed from the aspects of weather facts,weather causes and dynamic diagnosis.The results show that the strong cold air in West Siberia rapidly moved eastward,and the surface cold front moved eastward to Ulanqab with significant warming in the previous period,resulting in gale and sandstorm weather.This severe sandstorm process occurred in basically stable atmospheric stratification.During the strong sandstorm and extremely strong sandstorm process on March 15,the strong warming in the early period near the surface led to the surface thermal instability,and sand was generated by the upward movement of the Mongolian cyclone.Over the upper northwest air stream,barocline disturbance developed unsteadily,and the upper cold advection stimulated the secondary circulation of front perpendicular to the surface;the surface cyclone turned into strong cold front,and then strong sandstorm weather occurred in Ulanqab.展开更多
Based on NCEP/NCAR 1°×1°reanalysis data,according to the non-geostrophic wet Q vector,a rainstorm weather process in Ulanqab from July 24 to 25,2016 was diagnosed and analyzed.The results show that the ...Based on NCEP/NCAR 1°×1°reanalysis data,according to the non-geostrophic wet Q vector,a rainstorm weather process in Ulanqab from July 24 to 25,2016 was diagnosed and analyzed.The results show that the rainstorm area in Ulanqab City had a good corresponding relationship with the convergence area of non-geostrophic wet Q vector and the rising motion area.The rainstorm occurred in the convergence area of non-geostrophic wet Q vector divergence,and the secondary circulation excited by the non-geostrophic wet Q vector was conducive to the maintenance and development of rainstorm.The falling area of rainstorm was located on the side of the ascending branch of the secondary circulation.The non-geostrophic wet Q vector provides a new idea for the forecast of rainstorm and its falling area in Ulanqab.展开更多
文摘Hail is one of meteorological disasters affecting crop growth in Ulanqab City.It happens frequently from May to September,and this period is also the main growing season of crops.In this period,hail will cause damage to crops,make farmland soil harden,and bring varying degrees of harm to agricultural production.Artificial hail suppression is an important scientific and technological means for disaster prevention and mitigation.It is necessary to strengthen the monitoring,analysis and forecast of severe convection weather,intensify the release of early warning information of hail weather,provide accurate and reliable real-time information for the implementation of artificial hail suppression operations,strengthen the implementation of artificial weather modification,effectively carry out artificial hail suppression operations,and avoid and reduce the impact of hail disaster.
文摘Based on the conventional observation data and NCEP/NCAR reanalysis data,the circulation situation,influencing systems and causes of the heavy rain during September 20-21,2010 in Ulanqab City were analyzed from the evolution process of weather circulation situation and the changes of various physical quantity fields.The results show that there was an obvious frontal zone between 45-52°N,which brought strong cold air.The transport of warm and humid air outside the subtropical high and typhoon was the main water vapor source of the strong precipitation,and the southwest jet at 700 hPa transported abundant water vapor.There was a broad inverted trough to the south of 45°N,with a central value of 1000.0 hPa.Ulanqab City was on the top of the inverted trough,stable and less moved,which was conducive to the occurrence of systematic heavy precipitation.The rainstorm was a strong precipitation process caused by the intersection of cold air brought by the southward movement of the upper frontal zone and warm and humid air outside the subtropical high.After the precipitation,the invasion of strong cold air brought frost and cold wave weather to Ulanqab City.
文摘Based on the data of daily snowfall and weather phenomena of 11 national meteorological stations in Ulanqab City from 1991 to 2020,the spatial and temporal distribution characteristics of snowstorm were analyzed.The results show that the snowstorm in Ulanqab had obvious seasonal distribution characteristics,mainly happening in spring(March-May)and autumn(September-November).It also had obvious regional distribution in space,and the snowstorm center appeared in Chahar Right Wing Middle Banner and Jining District,namely the east side of the Yinshan Mountain.In the past 30 years,the amount of snowstorm in the whole year in Ulanqab showed a certain fluctuation trend,and the number of snowstorm days had shown an obvious upward trend since 2011.
文摘The severe sandstorm process in Ulanqab,Inner Mongolia on March 15,2021 was analyzed and discussed from the aspects of weather facts,weather causes and dynamic diagnosis.The results show that the strong cold air in West Siberia rapidly moved eastward,and the surface cold front moved eastward to Ulanqab with significant warming in the previous period,resulting in gale and sandstorm weather.This severe sandstorm process occurred in basically stable atmospheric stratification.During the strong sandstorm and extremely strong sandstorm process on March 15,the strong warming in the early period near the surface led to the surface thermal instability,and sand was generated by the upward movement of the Mongolian cyclone.Over the upper northwest air stream,barocline disturbance developed unsteadily,and the upper cold advection stimulated the secondary circulation of front perpendicular to the surface;the surface cyclone turned into strong cold front,and then strong sandstorm weather occurred in Ulanqab.
文摘Based on NCEP/NCAR 1°×1°reanalysis data,according to the non-geostrophic wet Q vector,a rainstorm weather process in Ulanqab from July 24 to 25,2016 was diagnosed and analyzed.The results show that the rainstorm area in Ulanqab City had a good corresponding relationship with the convergence area of non-geostrophic wet Q vector and the rising motion area.The rainstorm occurred in the convergence area of non-geostrophic wet Q vector divergence,and the secondary circulation excited by the non-geostrophic wet Q vector was conducive to the maintenance and development of rainstorm.The falling area of rainstorm was located on the side of the ascending branch of the secondary circulation.The non-geostrophic wet Q vector provides a new idea for the forecast of rainstorm and its falling area in Ulanqab.
