人为热源对城市边界层结构影响的数值模拟研究  

Numerical simulation of the impacts of anthropogenic heat on the structure of the urban boundary layer

作　　者：何晓凤[1] 蒋维楣[1] 陈燕[1] 刘罡[1] 

机构地区：[1]南京大学大气科学系

出　　处：《地球物理学报》2007年第1期74-82,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金重点项目(40333027)资助

摘　　要：用南京大学多尺度模式系统在不同区域进行了多种人为热源引入方案的研究,结果表明:考虑时空变化的人为热源按比例分别引入到地表能量平衡方程和大气热量守恒方程是将人为热源引入模式的最优方案.人为热通量密度变化的敏感性试验结果发现:人为热源的存在对城市热岛的生成有重要作用.计算结果表明,南京现有的人为热源排放量对该地区的城市热岛贡献率约为29.6%,若人为热通量密度在现有量值的基础上增大1倍,则其热岛贡献率可达42.9%;此外,人为热的排放对清晨城市边界层逆温结构有一定程度的破坏作用,能明显升高夜间近地层气温达0.5-1.0℃,并能使白天湍流活动的影响范围增大,混合层高度抬高,使夜间城市热岛环流的影响范围扩大.To study the prablem about how we can incorporate the anthropogenic heat flux into the model, some cases have been simulated using the Multi-Scale Numerical Modeling System developed by Nanjing University in different cities and different seasons. The simulation results show that the best scheme of including anthropogenic heat flux into the PBL model is to account for the urban canopy heating terms both in the surface energy budget and in the atmospheric heat conservation equation with certain proportions. Results of sensible tests about changing the value of the anthropogenic heat flux show that anthropogenic heat flux plays an important role in urban heat environment. The contribution of anthropogenic heat to UHI is 29.6% with Nanjing anthropogenic heat data in 2002. When heat emission doubling, it reaches 42.9%. The anthropogenic heat emission has impacts on PBL inversion structure during the morning and the intensity of UHI cyclone, and it could result in a 0.5 - 1.0 ℃ surface temperature increase at night.

关 键 词：城市边界层 人为热源 热通量密度 数值模拟 城市热岛 

分 类 号：P463[天文地球—大气科学及气象学]