2017年2月卢氏县寒潮暴雪天气成因分析
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摘要
利用常规天气观测资料,应用天气学原理诊断分析方法,对2017年2月河南省卢氏县出现的寒潮暴雪天气过程进行分析和总结,结果表明:500h Pa图上,沿乌山低槽后部的偏北气流不断引导新地岛附近的冷空气南下,在巴湖和天山北部经过2次堆积加强,然后快速东移至河西地区为西路冷空气;西西伯利亚地区的冷空气沿贝湖附近的脊前偏北气流下滑,在蒙古高原堆积加强,经我国东北地区扩散南下,影响华北地区为东路冷空气;东路引起回流的冷空气,与西路冷空气产生叠加效应,促使锋区加强南压;东亚大槽建立,槽后冷平流引导地面强冷空气大力南下,寒潮爆发。强冷平流是造成强降温的主要原因,850h Pa冷平流出现的区域与强降温的区域基本一致。此次暴雪天气过程主要是由于西南急流将孟加拉湾暖湿空气源源不断地输送到黄淮地区上空,以及低层回流冷性偏东气流和地形的抬升作用,加之水汽的大值区与700h Pa垂直速度大值区较好的配合而产生的。
Based on the conventional weather observation data and the diagnostic analysis method of synop-tic principle, the cold wave and snowstorm weather process in Lushi county of Henan province in February2017 was analyzed and summarized. The results showed that: On the 500 h Pa chart, the cold air was nearthe island, the northerly air flow along the back of the lower trough of the Wushan mountains continuouslyguidedthe cold air southward, and it was strengthened by two stacking in the northern part of Bahu andTianshan Mountains, and then rapidly movedeastward to the Hexi area, which was the cold air of the Westroad; The cold air in the West Siberia region descendedalong the ridge near the lake bei, on the Mongoliaplateau, the deposits strengthened and spread southward through the northeast of china, it affectedthe coldair in the east of North china; The cold air caused by the east route hada superposition effect with thecold air in the West road, Intensify frontal pressure in frontal zone; The large trough in East Asia was es-tablished, and the cold advection after the trough guided the strong cold air from the ground to the Southand the cold tide erupt. Strong cold advection was the main cause of strong cooling, the area of cold ad-vection of 850 h Pa was basically consistent with the region of strong cooling. The snowstorm process wasmainly due to the warm air over the bay of Bengal Everfount southwest jet transported to Huang Huaiover the area, and the low level of return cold easterly flow and topography uplift, and the large value ar-ea of water vapor and 700 h Pa vertical velocity of the high value of good coordination arising.
Based on the conventional weather observation data and the diagnostic analysis method of synop-tic principle, the cold wave and snowstorm weather process in Lushi county of Henan province in February2017 was analyzed and summarized. The results showed that: On the 500 h Pa chart, the cold air was nearthe island, the northerly air flow along the back of the lower trough of the Wushan mountains continuouslyguidedthe cold air southward, and it was strengthened by two stacking in the northern part of Bahu andTianshan Mountains, and then rapidly movedeastward to the Hexi area, which was the cold air of the Westroad; The cold air in the West Siberia region descendedalong the ridge near the lake bei, on the Mongoliaplateau, the deposits strengthened and spread southward through the northeast of china, it affectedthe coldair in the east of North china; The cold air caused by the east route hada superposition effect with thecold air in the West road, Intensify frontal pressure in frontal zone; The large trough in East Asia was es-tablished, and the cold advection after the trough guided the strong cold air from the ground to the Southand the cold tide erupt. Strong cold advection was the main cause of strong cooling, the area of cold ad-vection of 850 h Pa was basically consistent with the region of strong cooling. The snowstorm process wasmainly due to the warm air over the bay of Bengal Everfount southwest jet transported to Huang Huaiover the area, and the low level of return cold easterly flow and topography uplift, and the large value ar-ea of water vapor and 700 h Pa vertical velocity of the high value of good coordination arising.
引文
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[3]闫小利,余锦华,刘谦,等.河南省一次强寒潮天气诊断分析[J].气象与环境科学,2008(1):60-65.
[4]彭云峰,方安民,李景占,等.2004年3月15-18日平顶山寒潮天气成因分析[J].河南气象,2005(1):20-21.
[5]郭翠英,闫小利.2006年春季河南一次强寒潮天气诊断分析[J].气象与环境科学,2011(4):40-45.
[6]任晓燕,葛姣,梁钰,等.河南省寒潮特征分析与中期预报[J].河南气象,2002(4):9-10.
[7]刘传凤.我国寒潮气候评价[J].气象,1990(12):40-43.
[8]白岐风,尤莉.内蒙古寒潮的统计分析[J].内蒙古气象,1993(2):4-6.
[9]姚正兰.遵义市寒潮天气过程统计分析[J].贵州气象,2000(1):10-13.
[10]林爱兰,吴尚森.近40多年广东省的寒潮活动[J].热带气象报,1998(4):337-343.
[11]王明洁,周永吉,邹立尧.黑龙江省寒潮天气及预报[J].黑龙江气象,2000(3):29-32.
[12]丁一汇,王遵娅,何金海,等.近50年来中国气候变化特征的再分析[J].气象学报,2004(2):228-236.
[13]莫爱勰.2011年4月2日卢氏县寒潮天气成因分析[J].气象与环境科学,2012(2):78-82.
[14]谷秀杰,李周,鲁坦,等.2006年4月11-12日寒潮天气成因[J].气象与环境科学,2007(s1):19-21.
[15]河南省气象局.河南省短期天气预报手册[M].郑州:河南省气象局,1985.
[16]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(3):49-55.
[17]陈豫英,陈楠,邵建,等.2008年12月两次寒潮天气对比分析[J].气象,2009(11):29-38.