[Objective] The aim is to expound the abrupt rainstorm in the central Hunan Province on May 6 in 2010.[Method] By dint of NCEP 1°×1° reanalysis data,routine observation data,auto-station precipitation a...[Objective] The aim is to expound the abrupt rainstorm in the central Hunan Province on May 6 in 2010.[Method] By dint of NCEP 1°×1° reanalysis data,routine observation data,auto-station precipitation and FY-2C satellite data,the large-scale circulation background and physical condition during the large rainstorm period from the night on May 5 to 6 in 2010 were analyzed.The large scale environment,meso-scale characteristics and potential causes for the formation of large precipitation were revealed.By dint of FY-2D satellite and water-vapor cloud image,infrared cloud image,4 black light temperature,the variation characteristics of heavy rainstorm convection system were analyzed.[Result] Under the favorable environment background,the rainstorm was induced by the meso-scale convection system,and it had close relation with the upper-air trough,shear line in the middle and low layer,ground weak and cold air and the torrent in the upper and low latitude.The result of all kinds of physical quantities suggested that the meso-scale rainstorm above the air had distinct characteristics and the heavy precipitation was in the middle Hunan Province.It was caused by meso-system.The dynamic dry belt above the satellite,TBB=-60℃ center and the large value area of the gradient could provide references for the forecast and pre-warning of large rainstorm.[Conclusion] The study accumulated experiences for the forecast and report of rainstorm in Hunan Province.展开更多
为研究甘肃庆阳地区突发性暴雨和系统性暴雨成因及特征,给该地区的灾害性暴雨天气预报预警提供参考依据,本研究利用常规气象资料和诊断分析技术对比分析了庆阳地区2016年7月10日突发性暴雨和7月18日系统性暴雨过程。结果表明:(1)2次暴雨...为研究甘肃庆阳地区突发性暴雨和系统性暴雨成因及特征,给该地区的灾害性暴雨天气预报预警提供参考依据,本研究利用常规气象资料和诊断分析技术对比分析了庆阳地区2016年7月10日突发性暴雨和7月18日系统性暴雨过程。结果表明:(1)2次暴雨500 h Pa上都有低槽,均存在高空急流,且都上冷下暖,水汽均来源于孟加拉湾,中尺度云团都较为活跃,组织化程度较高;(2)主要影响系统"7.10"突发性暴雨是两高之间切变线、辐合线和低涡,范围较小,"7.18"系统性暴雨是东北低涡下滑冷空气、高原槽和低空急流,范围较大,持续时间较长。(3)"7.10"暴雨局地温湿条件更好,"7.18"暴雨水汽输送通道更畅通,辐合更明显,上升运动更强。(4)"7.10"暴雨较"7.18"暴雨具有更大的不稳定能量、更高的CAPE值和更强的垂直风切变,但垂直运动和辐合辐散均较弱。(5)"7.10"暴雨主要以孤立的对流性云团为主,云顶亮温很低,"7.18"暴雨主要以混合性云系为主,云顶亮温较低。展开更多
基金Supported by Key Project of Hunan Meteorological Bureau "Study on Formation Mechanism and Report Method Based on Comprehensive Meteorological Data"
文摘[Objective] The aim is to expound the abrupt rainstorm in the central Hunan Province on May 6 in 2010.[Method] By dint of NCEP 1°×1° reanalysis data,routine observation data,auto-station precipitation and FY-2C satellite data,the large-scale circulation background and physical condition during the large rainstorm period from the night on May 5 to 6 in 2010 were analyzed.The large scale environment,meso-scale characteristics and potential causes for the formation of large precipitation were revealed.By dint of FY-2D satellite and water-vapor cloud image,infrared cloud image,4 black light temperature,the variation characteristics of heavy rainstorm convection system were analyzed.[Result] Under the favorable environment background,the rainstorm was induced by the meso-scale convection system,and it had close relation with the upper-air trough,shear line in the middle and low layer,ground weak and cold air and the torrent in the upper and low latitude.The result of all kinds of physical quantities suggested that the meso-scale rainstorm above the air had distinct characteristics and the heavy precipitation was in the middle Hunan Province.It was caused by meso-system.The dynamic dry belt above the satellite,TBB=-60℃ center and the large value area of the gradient could provide references for the forecast and pre-warning of large rainstorm.[Conclusion] The study accumulated experiences for the forecast and report of rainstorm in Hunan Province.
文摘为研究甘肃庆阳地区突发性暴雨和系统性暴雨成因及特征,给该地区的灾害性暴雨天气预报预警提供参考依据,本研究利用常规气象资料和诊断分析技术对比分析了庆阳地区2016年7月10日突发性暴雨和7月18日系统性暴雨过程。结果表明:(1)2次暴雨500 h Pa上都有低槽,均存在高空急流,且都上冷下暖,水汽均来源于孟加拉湾,中尺度云团都较为活跃,组织化程度较高;(2)主要影响系统"7.10"突发性暴雨是两高之间切变线、辐合线和低涡,范围较小,"7.18"系统性暴雨是东北低涡下滑冷空气、高原槽和低空急流,范围较大,持续时间较长。(3)"7.10"暴雨局地温湿条件更好,"7.18"暴雨水汽输送通道更畅通,辐合更明显,上升运动更强。(4)"7.10"暴雨较"7.18"暴雨具有更大的不稳定能量、更高的CAPE值和更强的垂直风切变,但垂直运动和辐合辐散均较弱。(5)"7.10"暴雨主要以孤立的对流性云团为主,云顶亮温很低,"7.18"暴雨主要以混合性云系为主,云顶亮温较低。
