太湖湖风个例分析

利用太湖周边19个气象站及太湖中尺度通量观测网4个涡动通量观测站逐时风向、风速及温度的数据,以及苏州市6 min一次的风廓线雷达观测数据,对太湖2012年6月7日湖风的风、温及边界层高度特征进行了分析。结果表明,由于北岸及东岸存在苏州、无锡等城市,城市热岛环流与湖风环流相耦合,北岸和东岸湖风产生时间早于西岸和南岸。在湖风旺盛发展时刻,北岸及东岸的风向偏转速度大于南岸及西岸。湖风环流的垂直高度变化显著,在湖风发展最旺盛的14:00,湖风边界层高度可达550 m。

Analysis of a Lake Taihu Breeze case

Abstract: Hourly wind speed and direction, air temperature over land and lake surface temperature data from 19 meteorological stations and 4 heat flux stations of Eddy Covariance Mesonet on Lake Taihu, and the wind profile data per 6minutes on Suzhou city are analysed in order to characterize lake breeze at Lake Taihu at June 7, 2012. The result shows that: The onset time of the lake breeze on the northern and eastern shore is earlier than the western and southern shore due to the presence of the urban area. The shift rate of the wind direction on the northern and eastern shore is also faster than the western and southern shore. The diurnal variation of boundary layer height of the inflow layer of the lake Taihu breeze is very obvious, which is up to the maximum 550m at 14:00.