Constraint of anthropogenic NOx emissions in China from different sectors: a new methodology using multiple satellite retrievals
Constraint of anthropogenic NOx emissions in China from different sectors: a new methodology using multiple satellite retrievals
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DOI：
10.5194/acp-10-63-2010
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Boersma, K. F.
中科院分区：
文献类型：
--
作者：
Lin, J. -T.;McElroy, M. B.;Boersma, K. F.
2008年7月，开发了一种新的方法来限制中国四大行业(工业、发电厂、移动和居民)的人为氮氧化物(NOx)排放。它结合了从国美二号和大气层管理局反演对流层NO2柱，利用它们在中国上空的不同经过时间(类似于上午10：00)。(当地时间)与下午2点相似。)和一致的检索算法。这种方法是基于两台仪器立交点的NOx柱的差异；因此，它不太容易受到相互一致的个别反演中可能存在的系统误差的影响。此外，它还明确说明了个别来源的NOx排放的日变化和不确定性。我们最好的自上而下的估计表明，国家预算为6.8TGN/年(东中国为5.5TGN/年)，接近INTEX-B任务对2006年先验的自下而上的排放估计。自上而下的排放量低于北京附近、东北省份和东部沿海的先验排放量；但它们超过了许多内陆地区的先验排放量。卫星反演中的系统误差估计会导致对自上而下排放量的低估至多17%(最有可能是10%)。其他因素对自上而下估计的影响通常都不到15%，包括闪电、土壤排放、行星边界层的混合、人为一氧化碳和挥发性有机化合物的排放、先验排放的大小、关于排放日变化的假设以及四个部门的不确定性。中国东部的后验排放预算为5.7TGN/年。
A new methodology is developed to constrain Chinese anthropogenic emissions of nitrogen oxides (NOx) from four major sectors ( industry, power plants, mobile and residential) in July 2008. It combines tropospheric NO2 column retrievals from GOME-2 and OMI, taking advantage of their different passing time over China (similar to 10:00 a.m. LT ( local time) versus similar to 02:00 p. m.) and consistent retrieval algorithms. The approach is based on the difference of NOx columns at the overpass times of the two instruments; it thus is less susceptible to the likely systematic errors embedded in individual retrievals that are consistent with each other. Also, it explicitly accounts for diurnal variations and uncertainties of NOx emissions for individual sources. Our best top-down estimate suggests a national budget of 6.8 TgN/yr (5.5 TgN/yr for East China), close to the a priori bottom-up emission estimate from the INTEX-B mission for the year of 2006. The top-down emissions are lower than the a priori near Beijing, in the northeastern provinces and along the east coast; yet they exceed the a priori over many inland regions. Systematic errors in satellite retrievals are estimated to lead to underestimation of top-down emissions by at most 17% ( most likely 10%). Effects of other factors on the top-down estimate are typically less than 15% each, including lightning, soil emissions, mixing in planetary boundary layer, anthropogenic emissions of carbon monoxide and volatile organic compounds, magnitude of a priori emissions, assumptions on emission diurnal variations, and uncertainties in the four sectors. The a posteriori emission budget is 5.7 TgN/yr for East China.