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3.3 Effect of Temporal Averaging of Vertical Eddy Diffusivity on the Forecast Quality of Surface Ozone Concentration of the National Air Quality Forecast

机译:3.3垂直涡流时间平均对全国空气质量预报地面臭氧浓度预报质量的影响

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Air Quality forecast models are employed to provide numerical guidance for forecasters to issue timely ozone and particulate matter concentration forecast pertinent to human health exposures to the communities they serve. The National Centers for Environmental Prediction (NCEP), National Weather Service Weather Research and Forecasting Non-hydrostatic Mesoscale Model (WRF/NMM) has been coupled off-line with the EPA Community Multi-scale Air Quality (CMAQ) model in 2003 to form the National Air Quality Forecast Capability (NAQFC). Coupling of the turbulent mixing processes of the meteorological driver and CMAQ has been a challenge. WRF/NMM uses the Mellor-Yamada-Janjic (MYJ) turbulence mixing scheme in the boundary layer. The option of directly using MYJ provided vertical eddy diffusivity to calculate turbulent mixing of the atmospheric chemical constituents in CMAQ has been tested. This study investigated the effect of various temporal averaging treatments of vertical eddy diffusivity in redistributing ozone in the boundary layer. Model predicted concentration structures of ozone resulting from these various temporal treatments of vertical eddy diffusivity have been studied and verified using AIRNOW, an EPA surface ozone concentration network, and ozone-sonde data.
机译:空气质量预报模型用于为预报员提供数值指导,以便及时向他们服务的社区发布与人类健康暴露相关的臭氧和颗粒物浓度预报。国家环境预测中心(NCEP),国家气象局天气研究和预报非静水中尺度模型(WRF / NMM)已于2003年离线与EPA社区多尺度空气质量(CMAQ)模型结合使用国家空气质量预报能力(NAQFC)。气象驱动器和CMAQ的湍流混合过程的耦合一直是一个挑战。 WRF / NMM在边界层中使用Mellor-Yamada-Janjic(MYJ)湍流混合方案。已经测试了直接使用MYJ提供垂直涡流扩散率来计算CMAQ中大气化学成分的湍流混合的选项。这项研究调查了垂直涡流扩散率的各种时间平均处理对边界层中臭氧重新分布的影响。利用AIRNOW,EPA表面臭氧浓度网络和臭氧探空仪数据,研究和验证了由垂直涡流扩散率的各种时间处理产生的模型预测臭氧浓度结构。

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