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Dispersion simulations using HYSPLIT for the Sagebrush Tracer Experiment
Atmospheric Environment ( IF 5 ) Pub Date : 2018-08-01 , DOI: 10.1016/j.atmosenv.2018.05.012 Fong Ngan , Ariel Stein , Dennis Finn , Richard Eckman
Atmospheric Environment ( IF 5 ) Pub Date : 2018-08-01 , DOI: 10.1016/j.atmosenv.2018.05.012 Fong Ngan , Ariel Stein , Dennis Finn , Richard Eckman
Abstract The Sagebrush experiment, led by NOAA's Field Research Division of the Air Resources Laboratory, consisted of five releases (intensive observation periods, or IOPs) of a chemically inert trace gas on five days in October 2013. All releases occurred in the afternoon under either near neutral stability conditions with high wind speeds or unstable conditions with low wind speeds. The sampling network for the tracer concentrations covered distances 200 m–3200 m from the release location and samples were obtained in 10-min averages. HYSPLIT, NOAA's transport and dispersion model, was used to simulate the spatial and temporal distribution of the tracer. The dispersion simulations were driven by WRF meteorological data with 27-km to 333-m grid spacing and using the inline and offline approaches as well as different planetary boundary layer schemes and a large-eddy simulation parameterization. Comparisons with measured wind speeds showed that none of the WRF PBL schemes or the large-eddy simulation parameterization was able to reproduce the rapid increase in high wind speeds observed during IOP3. The dispersion results were compared with the tracer measurements obtained during the experiment. The HYSPLIT dispersion simulations for IOP3, driven by the WRF data generated with various PBL schemes, showed greater concentration variability than the simulations performed for IOP5. The comparison between the inline and offline HYSPLIT simulations showed that the inline approach statistically outperformed the offline approach in three out of four IOPs because the tight coupling between the advection and dispersion processes implemented in the inline approach produced higher simulated concentrations close to the release location.
中文翻译:
使用 HYSPLIT 进行 Sagebrush Tracer 实验的色散模拟
摘要 由 NOAA 空气资源实验室现场研究部领导的 Sagebrush 实验包括 2013 年 10 月五天的五次化学惰性痕量气体释放(密集观察期,或 IOPs)。所有释放都发生在下午具有高风速的近中性稳定条件或具有低风速的不稳定条件。示踪剂浓度的采样网络覆盖了距离释放地点 200 m–3200 m 的距离,并且样品是在 10 分钟的平均值内获得的。NOAA 的传输和扩散模型 HYSPLIT 用于模拟示踪剂的空间和时间分布。弥散模拟由具有 27 公里至 333 米网格间距的 WRF 气象数据驱动,并使用在线和离线方法以及不同的行星边界层方案和大涡模拟参数化。与实测风速的比较表明,WRF PBL 方案或大涡模拟参数化均无法重现 IOP3 期间观察到的高风速的快速增加。将分散结果与实验期间获得的示踪剂测量结果进行比较。由使用各种 PBL 方案生成的 WRF 数据驱动的 IOP3 的 HYSPLIT 分散模拟显示出比 IOP5 执行的模拟更大的浓度变异性。
更新日期:2018-08-01
中文翻译:
使用 HYSPLIT 进行 Sagebrush Tracer 实验的色散模拟
摘要 由 NOAA 空气资源实验室现场研究部领导的 Sagebrush 实验包括 2013 年 10 月五天的五次化学惰性痕量气体释放(密集观察期,或 IOPs)。所有释放都发生在下午具有高风速的近中性稳定条件或具有低风速的不稳定条件。示踪剂浓度的采样网络覆盖了距离释放地点 200 m–3200 m 的距离,并且样品是在 10 分钟的平均值内获得的。NOAA 的传输和扩散模型 HYSPLIT 用于模拟示踪剂的空间和时间分布。弥散模拟由具有 27 公里至 333 米网格间距的 WRF 气象数据驱动,并使用在线和离线方法以及不同的行星边界层方案和大涡模拟参数化。与实测风速的比较表明,WRF PBL 方案或大涡模拟参数化均无法重现 IOP3 期间观察到的高风速的快速增加。将分散结果与实验期间获得的示踪剂测量结果进行比较。由使用各种 PBL 方案生成的 WRF 数据驱动的 IOP3 的 HYSPLIT 分散模拟显示出比 IOP5 执行的模拟更大的浓度变异性。