摘要
为了研究城市边界层结构变化特征,2005年7月利用气象激光雷达在南京城区做了城市边界层探测试验,就此次观测试验作了简要叙述并选取部分观测资料为示例,着重对气象激光雷达确定城市边界层高度垂直分布及逐时变化以及地面气象环境对边界层的日变化影响进行了初步分析.结果表明,主要由近地层对流混合形成的城市边界层高度具有典型的日变化特点,早晚比较低,日间有一个从低到高再到低的变化过程.提出了一种由边界层混合状态确定边界层高度的方法.分析结果表明,由气溶胶消光系数确定城市边界层高度比较准确.将MSL探测结果与同步的低空无线电探测仪的温度探测结果进行比较,结果表明,两者获得的实际廓线分布相当吻合,线性良好.就地表温度、辐射、湿度及云等气象要素对边界层垂直分布及时间变化的影响做了分析.结果表明,这些气象要素的分布对城市边界层高度的垂直分布及其逐时变化有明显影响.
The lidar study of urban boundary layer over Nanjing city has been executed during the summer of 2005. A brief description and several cases acquired in July 2005 at the Nanjing city area are presented and analyzed. One kind of new techniques has been used and evaluated to determine the boundary layer height based on the mixing condition and aerosol extinction. Some comparisons on the UBL heights by both the approaches of the meteorological service lidar （MSL） and simultaneous radiosonde in the boundary layer showed it is more accordance reasonably between the MSL measurements and radiosonde in lower layer and the relative performance is pretty good, Besides, the influences induced from some meteorological elements including surface temperature, radiation, humidity and clouds etc. on the vertical distributions of the boundary layer and its variations hourly are obvious.
出处
《环境科学学报》
CAS
CSCD
北大核心
2006年第10期1723-1728,共6页
Acta Scientiae Circumstantiae
基金
中国科学院知识创新工程项目(No.CX0201)
国家自然科学基金重点项目(No.40333027)~~
关键词
大气探测
气象激光雷达
大气边界层
气溶胶消光系数
城市
atmosphere science
meteorological service LIDAR
atmospheric
boundary layer
aerosol extinction coefficient
urban
