摘要
利用布设于河南省济源市的新一代L波段高空气象探测雷达2007年1月至2020年12月间采集数据,分析研究济源市对流层风场特征。结果表明:济源市10000 m以下平均风速随高度单一增加趋势冬季相对剧烈,夏季相对平缓。1月开始各层特别是1000 m以上对流层水平风速逐渐减小,即大风区所在高度不断抬升,6-9月是各层风速相对较小的月份,自10月开始各层风速逐渐增大,大风区所在高度不断下降。对流层内10 m·s^(-1)以下的风速占比随高度均呈单一减少趋势,10 m·s^(-1)<风速≤20 m·s^(-1)的占比随高度变化呈先增后减的梭形,且最大占比所在高度层具有春季抬高、夏季最高、秋季下降、冬季最小的演变特征。30 m·s^(-1)以上的大风占比随高度呈单一增加趋势,但大风出现高度、增加速率和各层占比在各季表现不同,夏季出现高度最高且占比最少,春、秋季次之,冬季出现高度最低、增加速率最快且各层占比最多。济源市大陆性季风气候特征显著,对流层中高层全年主流风向以西风、西北风为主,低层1月以西北风为主,自2月开始主流风向由低到高顺时针偏转,6-7月东风占据主流风向且偏转高度达到最高,8月开始主流风向由高到低逆时针回转,11月整层重新转回西北风,这种状况一直维持到翌年1月。
Using the data measured by a new-generation L-band upper-air meteorological radar in Jiyuan,He′nan province from January of 2007 to December of 2020,the characteristics of the tropospheric wind field in Jiyuan were analyzed.The results showed that the average wind speed below 10000 m in Jiyuan has a single increase trend with height,which is relatively severe in winter and relatively gentle in summer.From January,the horizontal wind speed of each layer in Jiyuan,especially the troposphere above 1000 m,gradually decreases,that is,the height of the strong wind area continues to rise.From June to September,the wind speed of each layer is relatively small,and then it gradually increases from October and the height of the strong wind area keeps dropping.The proportion of wind speed below 10 m·s^(-1) in the troposphere shows a single decreasing trend with height,and the proportion of 10 m·s^(-1)<wind speed≤20 m·s^(-1) exhibits a fusiform pattern characterized by first increasing and then decreasing with height.The altitude where the largest proportion is located changes as being rising in spring,reaching the highest in summer,decreasing in autumn,and droping the lowest in winter.The proportion of strong winds above 30 m·s^(-1) shows a single increasing trend with height,however,its height,increasing rate,and proportion at each layer are different in different seasons,with the highesty height,and the lowest proportion of each layer in summer,followed by spring and autumn,and with the lowest height,the fastest increasing rate and the largest proportion of each layer in winter.The characteristics of the continental monsoon climate in Jiyuan throughout the year and the northwesterly winds are dominant in the lower layer in January.The dominant wind direction has been varied clockwise from the low layers to the high layers since February.From June to July,the easterly wind occupies,and the deflection height reaches the highest.In August,the dominant wind direction turns counterclockwise from high to low.In November,northwesterly winds are dominant in the entire layer and turn back again,which maintains until January of the following year.
作者
脱宇峰
邵铭
王亚华
卢强
张凯峰
TUO Yu-feng;SHAO Ming;WANG Ya-hua;LU Qiang;ZHANG Kai-feng(Key Laboratory of Electro-Optical Countermeasures Test&Evaluation Technology,Luoyang 471003,China;College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410003,China)
出处
《气象与环境学报》
2023年第1期83-91,共9页
Journal of Meteorology and Environment
基金
国家自然科学基金面上项目“大气气溶胶的空间谱特征分析和多尺度同化研究”(41775123)资助。
关键词
探空数据
高空风
风场特征
对流层
Sounding data
Upper-layer wind
Wind-field feature
Troposphere
