摘要
作者着眼于城市气溶胶辐射效应与大气边界层的相互作用问题，针对地形复杂的兰州市及周边地区，开发应用了WRF（Weather Research and Forecasting，天气研究和预报）模式，使之与包含了大气气溶胶辐射效应和气溶胶粒子扩散的综合大气边界层数值模式嵌套起来。通过个例分析，揭示了冬季气溶胶辐射效应对边界层结构的定量影响。主要特征为夜间气溶胶的长波辐射效应使地面附近的气温增高，增温幅度为0．1～0．3K／h，使低空（25-300m）大气层冷却，降温幅度为0．08～0．15K／h，风速在150m以下减小；白天气溶胶的短波辐射效应使地面层内明显增温，1h内升温约0．5K，增温最大值在混合层顶500-600m高度。受增温影响，垂直风场和水平风场随之调整，风速在450m以下增大约0．1m／s左右，而在450m以上风速减小0．1m／s左右。
Focusing on the interaction between the atmospheric boundary layer （ABL） and the radiative effect of urban aerosol, the paper develops and applies the weather research and forecasting （WRF） model, and performs some corresponding numerical simulations and theoretical analyses of Lanzhou area of a complex terrain based on some previous research results. The whole model system integrates the WRF model and the comprehensive ABL model, in which the radiative effect and the diffusion of urban aerosol particles are considered. First of all, using the NNRP2 data in 1989, the meteorological data and air quality data of ABL measurement campaign during December 1989 in Lanzhou, the verification of the model system has been worked out separately for the WRF model and the ABE model, which shows that the two models can run steadily and the performance of the simulated meteorology and concentration fields is preferable. Secondly, by integrating the WRF model and the ABE model with the nesting scheme, the numerical simulation and case analysis of the structures of ABL and characters of air pollutant diffusion under the influence of the radiative effect of atmospheric aerosol are performed. With the comparison of observations and simulated results without the nesting scheme, the simulated results are substantially reasonable and show that the nesting scheme has improved the ABL model＇s simulated ability. Finally, by employing the established ABL model which is integrated with the WRF model and considering of the diffusion of the aerosol particles and the radiative effect of atmospheric aerosol, the quantitative influence of the aerosol radiative effect on boundary layer structure is discussed. The primary character is that the long wave radiative effect of aerosol leads to an increase of the atmosphere temperature about 0.1 - 0. 3 K/h near the ground at night. The long wave radiative effect also makes the atmosphere temperature in the lower layer （25 - 300 m） descend about 0. 08 - 0. 15 K/h. The wind speed decreases
出处
《大气科学》
CSCD
北大核心
2006年第1期171-179,共9页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目40275039
国家重点基础研究发展规划项目G1999043400
关键词
气溶胶辐射效应
WRF模式
边界层
大气扩散
aerosol radiative effect, WRF model, boundary layer, atmospheric diffusion
