衡水市2次沙尘天气过程对比分析  

Comparative Analysis of Two Sand-dust Weather Processes in Hengshui City

作　　者：张玉婷 陈瑞敏 刘炳杰 吴雁 李月英 ZHANG Yuting(Meteorological Bureau of Hengshui City,Hengshui,Hebei 053000)

机构地区：[1]衡水市气象局,河北衡水053000 [2]沧州市气象局,河北沧州061000

出　　处：《农业灾害研究》2022年第3期45-47,50,共4页Journal of Agricultural Catastrophology

摘　　要：利用常规气象资料、风廓线雷达、气溶胶激光雷达等非常规气象资料,以及借助HYSPLIT后向轨迹模型和潜在源贡献分析法(PSCF),对比分析衡水市2021年3月15日与4月15日2次沙尘天气。结果表明:2次过程均受蒙古气旋和地面冷锋的影响,旋移动路径均为偏东路径,沙尘爆发前期200 hPa位于高空急流入口区左侧,辐合下沉运动有利于能量积累。315过程系统比415过程更强,但减弱更快、更偏北,并以回流形势影响河北省中南部,415过程无回流形势。2个过程高低层均存在逆温,415过程高层逆温层存在时间更长,导致沙尘天气维持时间较长,315过程低层逆温更强、维持时间更长。315过程沙源地降水和温度距平比415过程更大,其沙源地为蒙古大部地区、内蒙古中西部、河北省南部—山西—河南,415过程沙源地为蒙古大部地区、内蒙古中西部。315过程沙尘输送分为2个阶段并伴有沙尘回流,其输送高度较高,415过程输送高度较低并无沙尘回流。By using conventional meteorological data,wind profile radar,aerosol lidar and other unconventional meteorological data,as well as HYSPLIT backward trajectory model and potential source contribution analysis(PSCF),the dust weather on March 15 and April 15,2021 in Hengshui city was compared and analyzed.The results show that the two processes are affected by the Mongolian cyclone and the surface cold front,and the rotational movement path is east.200 hPa is located at the left side of the upper jet inlet area in the early stage of dust eruption,and the convergence and subsidence movement is beneficial to energy accumulation.The 315 process system was stronger than the 415 process,but weakened faster and more northward,and affected the central and southern Hebei province as a backflow situation.415process had no backflow situation.There were temperature inversions in both upper and lower layers of the two processes.In 415 process,the upper inversion layer existed for a longer time,resulting in a longer duration of sand-dust weather;in 315 process,the lower inversion was stronger and lasted longer.The precipitation and temperature anomalies of 315 process were larger than that of 415 process,and the sand sources of 315 process were most of Mongolia,central and western Inner Mongolia,southern Hebei province,Shanxi province and Henan province,while 415 process was most of Mongolia and central and western Inner Mongolia.The dust transport in 315 process was divided into two stages and accompanied by dust backflow,which had a high transport height.In 415 process,the transport height was low and there was no dust backflow.

关 键 词：沙尘天气 天气实况 环流形势 衡水市 

分 类 号：P445.4[天文地球—大气科学及气象学]