区域化学输送模式中NO x和O3源示踪法的引入

IMPLEMENTATION OF NOx AND O3 KEY SOURCE TRACING METHOD IN A REGIONAL CHEMICAL TRANSPORT MODEL

中文关键词:  臭氧，氮氧化物，示踪法，化学输送模式，光化学污染

英文关键词:Ozone,Nitrogen oxides,Tracing method,Chemical transport model,Photochemical pollution.

中文摘要:

      发展了化学输送模式中氮氧化合物（NOx）和臭氧（O3）的一种源示踪方法，对这种示踪法及其应用模式作了详细介绍，并结合臭氧光化学反应机理的分析描述了NOx和O3示踪物浓度方程的推导过程。将这种示踪法引用到区域化学输送模式中，并以太原和石家庄地表NOx人为排放产生的活性氮化物和臭氧为例，演示了污染物向北京的输送过程，模拟的O3，NO x和NOz示踪物浓度时空分布与O3，NOx和NOz在大气中的衰减尺度分析一致，表明该示踪法是一种有效的研究区域氮氧化物以及臭氧来源和输送转化过程的方法。个例模拟分析结果显示：太原和石家庄的地表人为排放产生的NOx本身并不能输送到北京，但通过它们产生的O3和HNO3可以输送到北京，对北京地表附近大气污染造成影响。

英文摘要:

      NOx and O3 key source tracing method was implemented in a regional chemical transport model with meteorological fields provided by the mesoscale model MM5. In t his paper we introduce this tracing method as well as the model to which it is a pplied in detail. The concentration equations for the traced species are describ ed in combination with an analysis of the ozone photochemical mechanism. This source tracing method was applied to a chemical transport model to investigate th e impacts of near by key pollution sources on the photochemical pollution in Be i jing. As a case study, the temporal and spatial distributions and variations of NOx and O3 due to the surface emission from Taiyuan and Shijiazhuang were si mula ted for a summertime period. It turns out that the distribution patterns of traced NOx, NOz and O3 are in agreement with the analyses of their atmospheric lifetime scales, indicating that this tracing method is a powerful method for studyin g the source and transform of nitrogen oxides and ozone on the regional scale. It is found from the case study that NOx originated from Taiyuan and Shijiazhuang itself cannot be transported into Beijing, however, its derivatives ozone and HNO3 can be transported into Beijing, polluting the urban atmosphere of the city.