春季晴日蒙古高原半干旱荒漠草原地边界层结构的一次观测研究  

An Observation Study of Atmosphere Boundary Layer Characteristic over Semi-Arid Desert Grassland in Mongolia Plateau on Clear Day in Spring

作　　者：岳平[1] 牛生杰[2] 张强[1] 沈建国 

机构地区：[1]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]南京信息工程大学,江苏南京210044 [3]内蒙古气象科学研究所,内蒙古呼和浩特010051

出　　处：《高原气象》2008年第4期757-763,共7页Plateau Meteorology

基　　金：国家自然科学基金项目(40765001,40705005,40175004,40765048);国家教育部博士点基金项目(20050300002);科技部公益专项(2005DIB3J108,KLME05006)共同资助

摘　　要：在科技部公益专项“沙尘气溶胶辐射模型及气候环境生态效应研究”支持下，执行期间在二连浩特气象站用GFE（L）1型二次测风雷达和GTS1型数字式探空仪，于2006年4月24～25日对内蒙古高原半干旱荒漠化草原地区春季典型晴日边界层特征进行了加密探测。结果表明：二连浩特地区边界层的日变化大，对流边界层最大高度可以达到2000m，超绝热层平均高度为270m，夜间稳定边界层高度可达到900m；白天在4000m附近存在高空急流，最大风速达到29m·s^-1；夜间近地面层有东风急流，其高度在250m左右，观测日低空急流最强时间是在23：00，风速达到16m·s^-1；边界层内湿度变化较大，呈现多层逆湿结构。To understand the structure characteristic and change laws of the atmosphere boundary layer over semi-arid desert grassland in Inner Mongolia, the situ experiment project named as ＂the aerosol of dust and sand radiate models and the research of climate environment and ecological effect＂ were conucted over the region of Inner Mongolia during March to April in 2006. Using GFE（L）1 and GTS1 equipments. The results show that the characteristic of atmosphere boundary layer change is instinct. The biggest depth of convective boundary layer is about 2000 m, the stable boundary layer depth is less than 900 m, the supper adiabatic boundary layer mean depth is 270 m. The wind direction changing height is from 600 to 2000 m. The lower level east jet appears at 250 m heighs, but west jet nearly appears at 4000 m highs. Multilevel humidity inversion appeared on the specific humidity profiles of the atmosphere boundary layer.

关 键 词：蒙古高原 边界层特征 低空急流 逆湿 

分 类 号：P404[天文地球—大气科学及气象学]