摘要
大气折射率结构常数C2n是描述大气湍流特性的重要参量。利用四川省气象局在盐源、大邑、新津、新都、龙泉驿地区布网的风廓线雷达实时采样得到的ROBS、HOBS数据,结合常规气象观测站提供的1小时温度、湿度数据进行统计分析,研究大气折射率结构常数在四川盆地及其周边地区的日变化分布特征与地面温度、湿度的相关性以及在降水过程中的变化趋势,对四川盆地大气湍流结构特性提供较清晰的认识。结果表明,C2n表现出明显的昼夜差别,白天和夜晚相差2个量级;在垂直方向1 km以内,C2n随高度增加而增大,1～3 km随高度增加先减小再增大,超过3 km以上随高度增加而减小;近地面C2n日变化与温度、湿度有相同变化趋势;随着降水过程的发生和发展,C2n有明显增大趋势,对降水具有指示意义。
The atmospheric structure constant of refractive index is an important parameter to describe the turbulent characteristics of the atmosphere.This paper uses the ROBS and HOBS data collected by the Sichuan Provincial Meteorological Bureau in wind source profile radars collected from Yanyuan,Dayi,Xinjin,Xindu,and Longquanyi areas in real time,and combines with the hourly temperature data provided by conventional meteorological observation stations for statistical analysis. To study the characteristics of the diurnal variation of atmospheric structure constant of refractive index in the Sichuan Basin and its surrounding areas,the correlation with surface temperature and humidity,and the trends during precipitation,and provide a clearer understanding of atmospheric turbulent structural characteristics in the Sichuan Basin.The results showed that there was a significant difference between day and night. The difference between day and night was two orders of magnitude.Within 1 km of the vertical direction,it increased with height,and 1-3 km first decreased and then increased with height,exceeding 3 km.With the increase of the height,the daily change near the ground has the same trend as the temperature and humidity.With the occurrence and development of the precipitation process,there is a clear trend of increase,indicating the significance of precipitation.
作者
李雅婷
苏德斌
孙晓光
范新岗
何柱良
LI Ya-ting;SU De-bin;SUN Xiao-guang;FAN Xin-gang;HE Zhu-liang(College of Eleetronie Engineering,CUIT,Chengdu 610225,China;Key Laboratory of Atmospheric Sounding,China Meteorlogical Administration,Chengdu 610225,China;Department of Geography and Geology,Western Kentucky University,Bowling Green,KY 42101,USA;Siehuan Provincial Meteorological Bureau,Chengdu 610072,China)
出处
《成都信息工程大学学报》
2018年第4期375-382,共8页
Journal of Chengdu University of Information Technology
基金
成都信息工程大学资助项目(KYTZ201529)
首都师范大学资助项目(2015H12)对本文的资助
关键词
大气科学
大气折射结构常数
风廓线雷达
特征分析
四川盆地
atmospheric science
atmospheric structure constant of refractive index
wind profile radar
feature analysis
Sichuan basin
