沈阳城市化进程对大气边界层影响研究

利用沈阳气象站2000-2010年高空观测数据,统计分析了各年探空温度和风速曲线,还依据统计得到的中性层结风速廓线资料,利用莫宁-奥布霍夫相似理论计算了下垫面的空气动力学参数,综合研究了沈阳城市化进程对大气边界层的影响。结果表明:(1)随着城市化进程的发展,地面平均温度呈逐年升高的趋势,但升温幅度很小;高层温度也有增加的趋势,增温幅度很小。(2)垂直温度递减率有增加的趋势,这表示城市化程度的发展对边界层的影响也是显著的。(3)由于下垫面城市化程度的提高,在不同高度上风速都有不同程度的减小的趋势。(4)摩擦速度逐年增加,对风速的消减作用逐渐增强;粗糙度逐年增高和零平面位移逐年增大,可见沈阳下垫面城市化的程度逐年增加。

Shenyang Urbanization Studies on the Effect of Atmospheric Boundary Layer

Using the Shenyang meteorological station 2000-2010 high altitude observation data,a statistical analysis of the radiosonde temperature and wind velocity curve,also based on the neutral layer wind profile data,use of Monin-Obukhov similarity theory calculation of aerodynamic parameters,comprehensive study of urbanization of Shenyang city in the atmospheric boundary layer effect.The results show that:(1)With the development of city development,the average surface temperature showed increasing tendency year by year,but the temperature rise is small;high temperature also had an increasing trend,increasing temperature range is very small.(2)In the vertical temperature lapse rate are increased,the degree of the said city development on the boundary layer effect is remarkable.(3)Because the underlying surface city changes rate rise,at different heights on wind speed has the varying degree decreased.(4)Friction velocity increased year by year,the wind speed subduction gradually;roughness increased year by year and the zero plane displacement increases year by year,see Shenyang underlying surface degree of city is increasing year by year.