| 复杂地形城市冬季边界层对气溶胶辐射效应的响应 |
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| 引用本文： | 郑飞,张镭,朱江.复杂地形城市冬季边界层对气溶胶辐射效应的响应[J].大气科学,2006,30(1):171-179. |
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| 作者姓名： | 郑飞 张镭 朱江 |
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| 作者单位： | 1.兰州大学大气科学学院,兰州,730000;中国科学院大气物理研究所国际气候与环境科学中心,北京,100029;中国科学院研究生院,北京,100039 |
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| 基金项目： | 中国科学院资助项目;科技部科研项目 |
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| 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0.1～0.3 K/h,使低空(25～300 m)大气层冷却,降温幅度为0.08～0.15 K/h,风速在150 m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,1 h内升温约0.5 K,增温最大值在混合层顶500～600 m高度.受增温影响,垂直风场和水平风场随之调整,风速在450 m以下增大约0.1 m/s左右,而在450 m以上风速减小0.1 m/s左右.
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| 关 键 词： | 气溶胶辐射效应 WRF模式 边界层 大气扩散 |
| 文章编号： | 1006-9895（2006）01-0171-09 |
| 收稿时间： | 2004-10-27 |
| 修稿时间： | 2004-10-272004-12-17 |
Responses of Urban Atmospheric Boundary Layer to Aerosol Radiative Effect over Complex Terrains in Winter |
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| ZHENG Fei,ZHANG Lei and ZHU Jiang.Responses of Urban Atmospheric Boundary Layer to Aerosol Radiative Effect over Complex Terrains in Winter[J].Chinese Journal of Atmospheric Sciences,2006,30(1):171-179. |
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| Authors: | ZHENG Fei ZHANG Lei and ZHU Jiang |
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| Institution: | 1 .College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000 ;2 .International Center for Climate and Environment Science, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; 3 .Graduate School of the Chinese Academy of Sciences, Beijing 100039 |
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| Abstract: | 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 ABL 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 ABL 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 0.10.3 K/h near the ground at night.The long wave radiative effect also makes the atmosphere temperature in the lower layer(25300 m) descend about 0.080.15 K/h.The wind speed decreases below 150 m level and the convection is strengthened at the same time.These variations can weaken the stability of boundary layer at night,but this effect can make the wind field(including vertical velocity) and other meteorology fields change at the same time.During daytime,there is an obvious heat increase in the boundary layer due to the aerosol shortwave radiative effect with the increment of about 0.5 K/h.The maximum of the temperature increase occurs near the mixed layer top(500600 m).Influenced by the temperature increase,the vertical wind field and horizontal wind field are adjusted correspondingly,and the wind speed increases by 0.1 m/s below 450 m level and decreases by 0.050.18 m/s above 450 m level.These variations clearly indicate that the differences of temperature increase at different levels induced by the aerosol shortwave radiative effect can weaken the stability of boundary layer to a certain extent,but a series of meteorology fields,including ascending velocity's increase and horizontal wind field's variations,are changed and adjusted by temperature increase. |
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| Keywords: | aerosol radiative effect WRF model boundary layer atmospheric diffusion |
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