南京冬季城、郊近地面湍流特征的对比分析  

Comparison of Turbulent Characters over Urban and Suburban Surface Layer in Nanjing Winter

作　　者：彭江良[1,2] 吴息[1] 江志红[1] 刘红年[3] 

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]新疆库车县气象局,新疆库车842000 [3]南京大学大气科学系,江苏南京210093

出　　处：《南京气象学院学报》2008年第6期871-878,共8页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金重点资助项目(40333027)

摘　　要：利用2006年2月17日—3月2日南京及其郊区的近地层湍流资料,分析了城、郊下垫面的无量纲化风速、温度的湍流特征,验证了Monin-obukhov(M-O)相似理论在城、郊下垫面的适用性,并与其他城市和地区的观测结果进行了比较,结果表明:在市区和郊区无量纲脉动风速标准差随稳定度的变化虽然都符合"1/3"次方律,但城、郊有一定差异,尤其在水平方向更为明显。在非中性时垂直向的变化要比水平向更符合"1/3"次方律;σT/|T*|与Z/L关系在城、郊有一定差异,在不稳定时在市区和郊区分别按"-1/3"次和"-2/3"次方规律变化,而在稳定时市区按"-2/3"次方变化,郊区无普适函数关系。在稳定和不稳定条件下,城、郊σT/|T*|都随着|Z/L|的减小而增大。By using the data observed in 17 February--2 March 2006, the turbulent characters of nondimensionalization wind velocity （u, v and w）, and air temperature at the urban and suburban sites in Nanjing are analyzed and compared to the results of other sites observations. In addition, the applicability of M-O similarity theory is validated over urban and suburb. Results show ： the standard deviation of dimensionless fluctuating wind velocity （u, v and w） varies with the 1/3 power of the stability with some differences over urban and suburban, the deviation in vertical is smaller than in horizontal, especially in non-neutral stratification. The normalized standard deviation of temperature increases with the stability decreasing, with some differences over urban and suburban underlying surface. Under unstable condition, the standard deviation of temperature varies with the - 1/3 power of the stability over urban but 2/3 power over suburban, under stable conditions, the - 1/3 power of the stability over urban can be found but no universal relationship over suburban.

关 键 词：近地面 湍流特征 相似理论 城市 郊区 

分 类 号：P404[天文地球—大气科学及气象学]