The Improvement in Model Simulations of the Atmospheric Condition in Beijing with Consideration of Anthropogenic Heat
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摘要: 将人为热排放纳入到已耦合城市模块Urban Canopy Model(UCM)的中尺度气象模式Weather Researchand Forecasting(WRF)中,探讨了人为热排放对于北京地区精细化模拟的重要意义,其影响主要体现在以下几个方面:1)可有效改善气象要素的模拟效果,特别是对于大气边界层高度的显著性改善,该变量是控制空气质量模式中污染物垂直扩散的关键因子;2)可较好地再现城区流场及温度场,使热岛强度和中心配置更接近实况;3)可明显改善数值模式对于污染物垂直分布特征的模拟。Abstract: Anthropogenic heat (AH) was considered in the Weather Research and Forecasting (WRF) model that is coupled with the urban canopy model (UCM) to investigate its effects on model simulations of the atmospheric condition in Beijing. Results indicated that:1) The consideration of AH can significantly improve the simulation of meteorological variables, especially in the simulation of the boundary layer height, which is a key factor that determines the vertical dispersion of pollutants in air quality models; 2) The model can better reproduce the spatial patterns of wind and temperature fields with the consideration of AH; 3) The vertical distribution of pollutants in the model simulation is also improved with the consideration of AH.
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Key words:
- Anthropogenic heat /
- WRF model /
- Heat islands effect /
- Boundary layer height
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表 1 物理过程及参数化方案
Table 1. Physical processes and parameterization schemes
物理过程 参数化方案 微物理 WRF Single-Moment 3-class 积云对流 No Cumulus 长波辐射 RRTM 短波辐射 Dudhia 陆面过程 Noah Land Surface Model 近地层 MM5 similarity 边界层 Yonsei University Scheme (YSU) 表 2 两组模拟试验的设计对比
Table 2. Model settings for the two experiments
试验 城市模型 下垫面 人为热 试验A UCM MODIS 不引入 试验B UCM MODIS 引入 表 3 2008 年7 月23~29 日风速观测模拟结果统计分析
Table 3. Statistical parameters of wind speed during 23−29 Jul 2008
站点 观测平均值/m s−1 模拟平均值/m s−1 平均偏差/m s−1 RMSE/m s−1 正态平均偏差 正态平均误差 Exp A Exp B Exp A Exp B Exp A Exp B Exp A Exp B Exp A Exp B 奥体 3.7 2.1 3.7 −1.2 0.3 2.2 2.2 34.5% 9.0% 50.0% 48.0% 朝阳 3.8 2.2 3.9 0.4 −1.3 2.2 2.2 34.7% 10.7% 49.2% 48.9% 观象台 2.6 2.6 2.8 0.2 0.4 1.8 1.7 7.7% 15.5% 53.3% 43.1% -
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