摘要
应用2006—2015年地面观测资料、micaps常规天气图资料对辽宁西部锦州地区偏南大风和偏北大风型沙尘天气的环流形势及地面要素特征进行对比分析。结果表明,锦州市沙尘天气以扬沙为主,根据风向可分为偏南大风型和偏北大风型,偏北大风型沙尘发生时均受冷空气东移南下影响,850hPa锋区迅速东移南压,偏北风风速20m/s以上,冷平流显著;偏南大风型500hPa锦州地区受高空槽前西南气流或中纬度较为平直的偏西气流控制,850hPa受温度脊控制,暖平流明显,对流层低层干燥且升温显著,风力加大,大气层结为中性或弱不稳定;偏南大风型沙尘风力和相对湿度明显大于偏北大风型,伴随强烈的正变温和负变压,偏北大风型以负变温和正变压为主。
Based on the ground observation data from 2006 to 2015 and the regular weather map data of micaps,the circulation situation and characteristics of ground elements of the southerly winds and northerly winds in the Jinzhou area of western Liaoning were compared and analyzed.The results showed that the dusty weather in Jinzhou City was dominated by sand,and it can be divided into southerly wind type and northerly wind type according to wind direction.When the northerly wind-type sand dust occurred,it was affected by the cold air moving eastward and southward.The 850hPa frontal area was rapidly moving eastward and southward.The northerly wind speed was above 20 m/s,and the cold advection was significant.The southerly windy type 500 hPa Jinzhou area was subject to high altitude.The southwest airflow in front of the trough or the relatively flat mid-latitude airflow control,the 850 hPa was controlled by the temperature ridge,the warm advection was obvious,the lower troposphere was dry and the temperature rose significantly,the wind was increased,the atmospheric layer was neutral or weakly unstable.The wind speed and relative humidity of south gale type dust were obviously greater than those of north gale type.South gale type dust was accompanied by a strong positive temperature change and a strong negative pressure change,when the north gale type dust was accompanied by a negative temperature change and a positive pressure change mainly.
作者
纪源
白雪
娄芳蕾
杨桂娟
史虹婷
JI Yuan;BAI Xue;LOU Fang-lei;YANG Gui-juan;SHI Hong-ting(Heishan Meteorological Bureau in Liaoning Province,Heishan Liaoning 121400;Jinzhou Meteorological Bureau)
出处
《现代农业科技》
2019年第14期181-183,共3页
Modern Agricultural Science and Technology
基金
锦州市气象局科研项目“锦州地区预报员综合手册”(201601)
关键词
沙尘
蒙古气旋
环流形势
地面要素
sand dust
Mongolia cyclone
circulation situation
ground factor
