Development of a Meteorology-Chemistry Two-Way Coupled Numerical Model(WRF-NAQPMS) and Its Application in a Severe Autumn Haze Simulation over the Beijing-Tianjin-Hebei Area, China
Development of a Meteorology-Chemistry Two-Way Coupled Numerical Model(WRF-NAQPMS) and Its Application in a Severe Autumn Haze Simulation over the Beijing-Tianjin-Hebei Area, China
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发表时间：
2014
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通讯作者：
Wang Zh
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作者：
Wang Zh
在巢式空气质量预报模式系统（NAQPMS）中实现了基于Mie散射理论的气溶胶光学模块，并开发了一种新的耦合器来处理天气研究与预报模式WRF与NAQPMS之间的相互作用。比较了单向离线模式和双向耦合WRF-NAQPMS模式对2013年9月27日至10月1日京津冀地区重度雾霾天气的模拟结果。结果表明，考虑气溶胶直接辐射效应的双向耦合模式模拟的气象要素和PM2.5浓度与观测值更为吻合。雾霾期间，京津冀地区边界层气象要素因气溶胶直接辐射效应发生显著变化：入射太阳辐射减少25%，2 m温度降低1℃，湍流动能降低25%，10 m风速降低0.2 m/s，行星边界层高度降低25%。这些变化使大气边界层更加稳定，并进一步加剧了已经严重的地区的空气污染，例如石家庄市的PM2.5浓度增加了30%。分析表明，雾霾与边界层气象之间存在正反馈机制，结合这种反馈的双向耦合模式有助于雾霾污染过程的准确模拟和预报。
An aerosol-optical module based on Mie scattering theory has been implemented in the Nested Air Quality Prediction Modeling System(NAQPMS), and a new coupler has been developed to deal with the interaction between themesoscale meteorology model WRF(Weather Research and Forecasting Model) and NAQPMS. The one-way off-line and two-way coupled WRF-NAQPMS models are compared to simulate the severe haze in the Beijing-Tianjin-Hebei area from 27 September to 1 October 2013. The results show that the simulated meteorological elements and PM2.5 concentrations from the two-way coupled model with the aerosol direct radiation effect are more consistent with observations. During the haze period, the boundary layer meteorological elements change significantly because of the aerosol direct radiation effect over the Beijing-Tianjin-Hebei area: Incoming solar radiation is reduced by 25%, the 2-m temperature decreases by 1 °C, the turbulent kinetic energy is reduced by 25%, the 10-m wind speed decreases by up to 0.2 m/s, and the planetary boundary layer(PBL) height is reduced by 25%. These changes make the atmospheric boundary layer more stable and further exacerbate air pollution over the areas where it is already severe, for example, the PM2.5 concentration increases by up to 30% over Shijiazhuang City. The analysis indicates that there is a positive feedback mechanism between haze and boundary layer meteorology, and the two-way coupled model incorporating this feedback is helpful for accurate simulation and forecasting of haze pollution processes.