摘要
利用JICA计划中日合作"2008年季风过程与暴雨天气上游关键区综合气象观测试验"期间在大理国家气候观象台的GPS探空加密观测资料,分析了洱海湖滨区大气边界层厚度、位温、比湿、风速、风向的垂直结构。结果表明,洱海湖滨大气边界层结构具有显著的日变化特征,边界层厚度日变化较大,对流边界层厚度在190～2500 m之间,平均厚度为1061 m;稳定边界层厚度在60～1760 m之间,平均厚度为467 m。无论在干季还是在湿季,大约在2400 m以上,气流主要受大尺度的大气环流的控制,以西风气流为主。在2400 m以下,气流主要受苍山和洱海的影响,可能存在着山谷风和湖陆风两者叠加效应引起的局地环流。大约在500 m以下,白天多为东风和东南风,夜间多为西风和西南风。
Using the air sounding data from JICA project of China-Japan cooperation on the planned integrated meteorological observation experiment in monsoon process and heavy rain over the key upper-stream areas in 2008,the characteristics of atmospheric boundary layer height,potential temperature,specific humidity,wind speed and wind direction were analyzed.The results showed that the depth of the convective boundary layer is between 190 m and 2500 m and its average is 1061 m,but the depth of the stable boundary layer is between 60 m and 1760 m and its average is 467 m.Whether in the dry season or in the wet season,air flow is mainly westerly flow and affected by largescale circulation above 2400 m,but it may exist local circulation that caused by lakeland breeze and mountain-valley wind,and air flow is mainly affected by the mountain of Cangshan and Erhai lake below 2400 m.Below about 500 m wind are the mainly wind direction is east and southeast in day time,and south and southwest at night time.
出处
《高原气象》
CSCD
北大核心
2010年第3期637-644,共8页
Plateau Meteorology
基金
云南省自然科学基金面上项目(2008CD178)
云南省气象局青年研究基金项目(Q200808)
大理州气象局"短平快"项目共同资助
关键词
洱海湖滨
大气边界层
干季
湿季
Erhai Lakeside
Atmospheric boundary layer
Dry season
Wet season
