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Intercontinental source attribution of ozone pollution at western U.S. sites using an adjoint method

机译:使用伴随法在美国西部站点的洲际臭氧污染源分布

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We use the GEOS-Chem chemical transport model and its adjoint to quantify source contributions to ozone pollution at two adjacent sites on the U.S. west coast in spring 2006: Mt. Bachelor Observatory (MBO) at 2.7 km altitude and Trinidad Head (TH) at sea level. The adjoint computes the sensitivity of ozone concentrations at the receptor sites to ozone production rates at 2° x 2.5°resolution over the history of air parcels reaching the site.MBO experiences distinct Asian ozone pollution episodes;most of the ozone production in these episodes takes place over East Asia with maxima over northeast China and southern Japan, adding to a diffuse background production distributed over the extratropical northern hemisphere. TH shows the same Asian origins for ozone as MBO but no distinct Asian pollution episodes. We find that transpacific pollution plumes transported in the free troposphere are diluted by a factor of 3 when entrained into the boundary layer, explaining why these plumes are undetectable in U.S. surface air.
机译:我们使用GEOS-Chem化学迁移模型及其伴随模型来量化2006年春季美国西海岸两个相邻地点对臭氧污染的源贡献:海拔2.7 km的单身汉天文台(MBO)和海拔高度的特立尼达海德(TH)。该附件计算了在到达该地点的航空器历史上受体站点上的臭氧浓度对2°x 2.5°分辨率下臭氧产生速率的敏感性.MBO经历了独特的亚洲臭氧污染事件;这些事件中的大多数臭氧产生需要分布在东亚上空,最大值出现在中国东北和日本南部,增加了在温带北半球分布的背景分布。 TH显示出与MBO相同的亚洲臭氧起源,但没有明显的亚洲污染事件。我们发现,在自由对流层中运输的跨太平洋污染羽流被带入边界层时被稀释了3倍,这解释了为什么在美国地面空气中无法检测到这些羽流。

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