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A comparative study of US EPA 1996 and 1999 emission inventories in the west Gulf of Mexico coast region, USA

机译:美国EPA墨西哥湾西海岸地区1996年和1999年排放清单的比较研究

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摘要

Emission inventory is one of the required inputs to air quality models. To assist in the urban and regional modeling efforts, United States Environmental Protection Agency (EPA) has compiled a National Emission Inventory (NEI) for criterion pollutants, and the precursors of ozone and paniculate matter (PM). In December 2002, EPA released the 1999 NEI estimates (NEI99), which represent the most recent national emission data. However, the data sets are not in model-ready format for air quality simulations. This present work converts the NEI99 Final Version 2 data sets into Inventory Data Analyzer (IDA) format and processes the data using the Sparse Matrix Operator Kernel Emissions (SMOKE) modeling system to generate a gridded emission inventory in a domain covering the west Gulf Coast Region, USA. The spatial and diurnal emission characteristics of the gridded emission inventories are then assessed and compared with those of the National Emission Trend 1996 (NET96). The NEI99 database contains more complete emission records in both area and point sources. It is also found that NEI99 data exhibit greater emissions with respect to point and mobile sources but smaller emissions with respect to area sources when compared to the corresponding gridded NET96 data in the same study domain. The most distinct differences between the NEI99 and NET96 databases are CO emission of mobile sources, SO_2 emissions of point sources, and VOC/PM/NH_3/NO_x emissions of area and non-road sources. The gridded NEI99 data show low VOC/NOx ratios (< 2-5) in the urban areas of the study domain.
机译:排放清单是空气质量模型的必要输入之一。为了协助进行城市和区域建模工作,美国环境保护局(EPA)编制了国家排放清单(NEI),用于标准污染物以及臭氧和颗粒物(PM)的前体。 EPA在2002年12月发布了1999年NEI估算值(NEI99),它代表了最新的国家排放数据。但是,这些数据集并非以模型就绪的格式进行空气质量模拟。本工作将NEI99最终版本2数据集转换为库存数据分析器(IDA)格式,并使用稀疏矩阵算子内核排放(SMOKE)建模系统处理数据,以在覆盖西墨西哥湾沿岸地区的域中生成网格排放清单, 美国。然后评估栅格化排放清单的空间和日排放特征,并将其与《 1996年国家排放趋势》(NET96)进行比较。 NEI99数据库包含区域和点源中更完整的排放记录。还发现,与同一研究领域中的相应网格化NET96数据相比,NEI99数据相对于点源和移动源显示出较大的排放量,而相对于面源则显示出较小的排放量。 NEI99和NET96数据库之间最明显的区别是移动源的CO排放,点源的SO_2排放以及区域和非道路源的VOC / PM / NH_3 / NO_x排放。网格化的NEI99数据显示,研究范围内的城市地区VOC / NOx比率较低(<2-5)。

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