2022年“2.13”冀中大雪过程多源气象资料分析  

Analysis of Multi-source Meteorological Data on“2.13”Heavy Snowfall Process in Central Hebei in 2022

作　　者：马鸿青[1] 董疆南 徐义国[1] 于雷[1] 王亚婷 MA Hongqing;DONG Jiangnan;XU Yiguo;YU Lei;WANG Yating(Baoding Meteorological Bureau,Baoding 071000,Hebei Province,China)

机构地区：[1]保定市气象局,河北保定071000

出　　处：《天津科技》2024年第2期91-95,共5页Tianjin Science & Technology

摘　　要：利用常规观测资料、era5再分析资料、风廓线雷达产品、地基GPS/MET大气可降水量(precipitable water vapor,PWV)等,对2022年2月13日冀中大雪过程进行了详细分析。①降雪发生之前的36 h内PWV呈增长态势,0~12 h上升最快,12~36 h呈缓慢上升趋势。②降水量和PWV呈一定正相关关系,降雪期间PWV变化平稳,随着PWV出现连续下降,降水结束。③风廓线雷达的水平风向风速演变对降雪的预报有一定指示意义:3000 m突然出现20 m/s的西南低空急流,随着20 m/s的西南低空急流向下延伸至2500 m高度,降雪增强。④降雪之前,0.5 m/s及以上的正速度首先出现在1500 m以上,当2000 m以下突然出现1.0 m/s以上的正速度后,0~3 h内降雪发生。⑤1000 m以下垂直速度增加到1.5 m/s及以上时,降雪增强。⑥降雪期间C_(n)^(2)(大气折射率结构常数)一直稳定在-180~-165 dB,C_(n)^(2)值小于-180 dB时,最大探测高度降至3500 m以下,整层垂直速度小于0.5 m/s,预示降雪结束。Using conventional observation data,era5 reanalysis data,wind profile radar products,ground-based GPS/MET and precipitable water vapor(PWV),the process of heavy snowfall in Central Hebei on February 13,2022 was analyzed in detail.The results showed that within 36 h before snowfall,PWV showed an increasing trend,with the fastest increase from 0 to 12 h and a slow increase from 12 to 36 h.There was a positive correlation between precipitation and PWV,and the change of PWV was stable during snowfall.With the continuous decline of PWV,the precipitation ended.The evolution of horizontal wind direction and wind speed of wind profile radar had certain indication significance for snowfall forecast.The southwest low-level jet of 20 m/s suddenly appeared at 3000 m,and the snowfall increases as the southwest low-level jet of 20 m/s extended downward to a height of 2500 m.Before the snowfall,the positive velocity of 0.5 m/s and above first appeared above 1500 m.When the positive velocity of 1.0 m/s or above suddenly appeared below 2000 m,the snowfall will occurred within 0-3 h.When the vertical velocity below 1000 m increased to 1.5 m/s and above,the snowfall intensified.The value was stable from-180 dB to-165 dB during snowfall.The value was less than-180 dB,the maximum detection height dropped below 3500 m,and the vertical velocity of the whole layer was less than 0.5 m/s,indicating the end of snowfall.

关 键 词：风廓线雷达 大气可降水量 大雪 低空急流 

分 类 号：P458.121[天文地球—大气科学及气象学]