牡丹江地区两场暴雪过程的对比分析

A comparative analysis of two blizzard processes in Mudanjiang area

本文利用常规观测资料,对2014年11月30日和2016年11月4日牡丹江出现的两场暴雪天气过程进行初步对比分析,结果表明:过程1是高空阶梯槽的形成和维持,为暴雪提供了有利的环流背景,配合地面低压倒槽结构产生的暴雪过程;过程2是鄂霍次克海上空的冷涡系统配合西北高空急流,将西伯利亚附近的冷空气输送到黑龙江省,与低层的暖湿空气交汇而产生的,地面受蒙古低压影响。物理量场上,过程2水汽条件和动力条件均好于过程1,充足的水汽条件是降水过程产生和维持的重要条件,而低层辐合高层辐散的抽吸作用,为降水的产生提供了有利动力条件。

Analyze the two snowstorm weather events of Mudanjiang happened on November 30, 2014 and November 4, 2016 with the conventional observation data, the results show that, Process 1： the formation and maintenance of the high-altitude ladder provides a favorable circulation background and with the ground low-pressure inverted structure which yield the Blizzard;process2： Okhotsk sea cold vortex system with the northwest high-altitude jet bring the cold air near Siberia to Heilongjiang province, which join in the low-level warm and humid air and Blizzard happened, the ground is affected by low pressure in Mongolia. Physical field, water vapor conditions and dynamic conditions of the process of 2 are better than that of the process 1, the sufficient water vapor condition is an important condition for the generation and maintenance of the precipitation process, while the low-level convergence of the high-level divergence of the suction effect provide a favorable power conditions to the precipitation.