基于模型化学机理的VOCs化学物种谱建立与对比分析

Development of local model-ready source profiles of VOCs and comparison with USEPA SPECIATE database

本研究在珠江三角洲地区(以下简称珠三角)道路移动源、工业有机溶剂及非工业有机溶剂使用源VOCs化学成分谱实测研究的基础上,建立了基于大气模型化学机理CB05和SAPRC-07的本地化模型物种谱,并与基于美国环保署SPECIATE数据库建立的物种谱进行对比分析.结果表明,1基于SAPRC-07机制建立的本地物种谱与SPECIATE差异较CB05机制明显;2制鞋、家具制造、轻型汽油车和摩托车本地物种谱与SPECIATE物种化结果差异较小;3印制电路板、轻型柴油车、LPG出租车及非工业有机溶剂使用源的物种谱差异较为显著.从模型物种谱对模型模拟结果的影响考虑,模型物种谱应尽量基于本地源化学成分谱建立;此外,对于重要源排放成分谱数据缺失的区域,利用SPECIATE数据作为模型物种输入文件时,建议优先选取CB05机制,以期提高空气质量模型模拟的可靠性和准确性.

Based upon chemical speciated source profiles of major VOCs sources in the Pearl River Delta region,i.e.,on-road mobile source,industrial solvent usage source and non-industrial solvent usage source,local model-ready source profiles of the CB05 and the SAPRC-07 chemical mechanisms were developed and compared with the USEPA SPEICATE. Results showed that： 1 under the SAPRC-07 chemical mechanism,differences between local and USEPA SPECIATE profiles in different sources were more significant than CB05; 2 local and SPECIATE profiles were generally consistent in shoe-making industry,furniture-making industry,gasoline light duty vehicles and motorcycles, and 3 obvious discrepancies were observed in PCBmanufacturing industry,diesel light duty vehicles,LPG taxis and non-industrial solvent usage source. Given above differences and their potential influences in air quality modeling,localization of model speciated source profiles were needed. For areas still using non-local source profiles,the model speciated profiles for CB05 mechanism are recommended.