摘要
为了研究冬季北京城区大气边界层结构的特征 ,分别在城区和郊区 4个观测点利用系留气艇在 2 0 0 1年 1月 5～ 1 3日和 2月 2 1～ 2 8日进行了大气廓线探测 ,并分析了温度和风廓线垂直变化的基本特征。初步结果显示 :城市热岛效应十分明显 ,热岛强度随高度增加而递减 ,近地层热岛强度在晴天最大可达到 4℃左右。除了近地层郊区的风速大于城区外 ,城区和郊区风速的垂直分布特征有较大差异。在 1 0 0～ 2 0 0m高度以下 ,城区和郊区风速和风向随高度分布都出现了明显的拐点 ,3 0 0m以上高度风向和风速基本趋于一致 ,表明城区和郊区的风廓线均受到城市覆盖层的影响。随着北京市区的规模不断扩大 。
The urban boundary layer sounding experiment is performed in January and February of 2001 in order to study the influence of the urban area of Beijing on the vertical structure and diurnal evolution of the atmospheric boundary layer. The atmospheric profile sounding was performed using captive balloons at two urban sites and two rural suburb sites. The general characteristics of temperature and wind speed and direction and the intensity of urban heat island variations with height are presented. The result shows: the urban effect is significant; the intensity of urban heat island reduces with height with a maximum of about 4 ℃ near the surface layer in the clear sky condition and the urban heat disappears above 200 m; wind speed below 200 m in the urban area is greater than that in the rural area, and the vertical structures of temperature, wind speed and direction are influenced by the city overlay; and there are not much differences with height above 300 m.
出处
《应用气象学报》
CSCD
北大核心
2002年第U01期13-25,共13页
Journal of Applied Meteorological Science
基金
<国家重点基础研究发展规划>项目 :首都北京及周边地区大气
水
土环境污染机理与调控原理 (项目编号 :G1 9990 4 5 70 0 )资助
