黔南冬末春初两次寒潮过程对比分析
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摘要
利用常规资料和NCEP/NCAR再分析资料对黔南2017年2月和2016年3月的两次寒潮天气过程进行对比分析,发现:两次寒潮过程,在有利的中层低槽引导下,低于-40℃的冷中心是寒潮强度较强的关键因素;地面蒙古高压对寒潮强度亦存在较大影响,但寒潮强度与冷空气入侵贵州的路径无对应关系;降水中心与水汽辐合区、垂直速度上升区相对应,降水相态在冷空气影响1～2 d后由雨转雪;出现冰雹的时间、区域与出现高CAPE值的时间、区域不一定是对应关系。
Using the Micaps system routine data and NCEP/NCAR reanalysis data, a comparative analysis of the two cold wave weather processes in Qiannan in February 2017 and March 2016 was conducted. The results reveal that:During the two cold wave processes, the cold center below-40 ℃ is the key factor for the strong cold wave intensity under the favorable middle and low trough guidance;the ground Mongolian high pressure also has a great influence on the cold wave intensity,However,there is no correspondence between the cold wave intensity and the path of cold air invading Guizhou;the precipitation center corresponds to the water vapor convergence zone and the vertical velocity rise zone, and the precipitation phase changes from rain to snow after 1～2 days of cold air influence; The occurrence of hail time and regional and CAPE values are not necessarily corresponding.
Using the Micaps system routine data and NCEP/NCAR reanalysis data, a comparative analysis of the two cold wave weather processes in Qiannan in February 2017 and March 2016 was conducted. The results reveal that:During the two cold wave processes, the cold center below-40 ℃ is the key factor for the strong cold wave intensity under the favorable middle and low trough guidance;the ground Mongolian high pressure also has a great influence on the cold wave intensity,However,there is no correspondence between the cold wave intensity and the path of cold air invading Guizhou;the precipitation center corresponds to the water vapor convergence zone and the vertical velocity rise zone, and the precipitation phase changes from rain to snow after 1～2 days of cold air influence; The occurrence of hail time and regional and CAPE values are not necessarily corresponding.
引文
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[3] 罗圆,马文军,刘涛,等.极端气候对健康的影响[J]. 华南预防医学,2012,38(2):75-77
[4] 刘丽.低纬高原冬季寒潮天气个例分析[J].气象,2001(09):53-55.
[5] 许爱华,乔林,詹丰兴,等.2005年3月一次寒潮天气过程的诊断分析[J].气象,2006,32(2):49-55.
[6] 张艳梅,张普宇,顾欣,等.贵州高压寒潮灾害的气候特征分析[J].中国农业气象,2010(1):151-154.
[7] 俞小鼎,姚秀萍,熊廷南,等.多普勒天气雷达原理与业务应用[M].北京:气象出版社,2006:145-149.
[8] 贵州天气预报员手册编辑部.贵州天气预报员手册[M].2013:233-295.