Impacts of boundary layer mixing on pollutant vertical profiles in the lower troposphere: Implications to satellite remote sensing
Impacts of boundary layer mixing on pollutant vertical profiles in the lower troposphere: Implications to satellite remote sensing
复制标题
DOI：
10.1016/j.atmosenv.2010.02.009
复制
发表时间：
2010-05-01
影响因子：
5
通讯作者：
McElroy, Michael B.
中科院分区：
文献类型：
--
作者：
Lin, Jin-Tai;McElroy, Michael B.
行星边界层的混合影响对流层低层大气示踪剂的垂直分布。边界层混合的准确表示是关键的化学传输模式（CTM）的应用程序敏感的示踪剂的垂直剖面模拟。在广泛使用的全球CTM GEOS-Chem中的完全混合假设最近补充了非本地PBL方案。本研究分析了非本地方案的影响模式表示的PBL混合，空气示踪剂和地面空气污染的垂直廓线模拟的后果，以及对卫星遥感数据的解释模型应用的影响。根据2004年夏天使用飞机测量的评估，非局部方案显着改善了NO2和O-3垂直分布的模拟。根据地面观测的评估，它还将美国夜间地面臭氧浓度的模型偏差降低了10 ppb以上，下午臭氧峰值的模型偏差降低了2-5 ppb。利用OMI和GOME-2卫星反演的NO2数据反演中国东部地区的人为NOx排放，结果表明，完全混合假设导致自上而下的排放预算与非本地方案相比有3-14%的差异。结合非局地方案和Lin等人的逆模型方法的自上而下的估计表明，2008年7月华东地区NOx排放量为6.6 TgN yr（-1），2009年1月为8.0 TgN yr（-1），其量级和季节性与自下而上的估计吻合得很好。(C)2010爱思唯尔有限公司版权所有。
Mixing in the planetary boundary layer (PBL) affects vertical distributions of air tracers in the lower troposphere. An accurate representation of PBL mixing is critical for chemical-transport models (CTMs) for applications sensitive to simulations of the vertical profiles of tracers. The full mixing assumption in the widely used global CTM GEOS-Chem has recently been supplemented with a non-local PBL scheme. This study analyzes the impact of the non-local scheme on model representation of PBL mixing, consequences for simulations of vertical profiles of air tracers and surface air pollution, and implications for model applications to the interpretation of data retrieved from satellite remote sensing. The non-local scheme significantly improves simulations of the vertical distributions for NO2 and O-3, as evaluated using aircraft measurements in summer 2004. It also reduces model biases over the U.S. by more than 10 ppb for surface ozone concentrations at night and by 2-5 ppb for peak ozone in the afternoon, as evaluated using ground observations. The application to inverse modeling of anthropogenic NOx emissions for East China using satellite retrievals of NO2 from OMI and GOME-2 suggests that the full mixing assumption results in 3-14% differences in top-down emission budgets as compared to the non-local scheme. The top-down estimate combining the non-local scheme and the Lin et al. inverse modeling approach suggests a magnitude of 6.6 TgN yr(-1) for emissions of NOx over East China in July 2008 and 8.0 TgN yr(-1) for January 2009, with the magnitude and seasonality in good agreement with bottom-up estimates. (C) 2010 Elsevier Ltd. All rights reserved.