Impact of a new condensed toluene mechanism on air quality model predictions in the US
Impact of a new condensed toluene mechanism on air quality model predictions in the US
复制标题
新的浓缩甲苯机制对美国空气质量模型预测的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Majeed
中科院分区：
文献类型：
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作者：
G. Sarwar;K. Appel;A. Carlton;R. Mathur;K. Schere;R. Zhang;M. Majeed
抽象的。一个新的冷凝甲苯机制被纳入社区多尺度空气质量模拟系统。使用CB 05化学机制，包含现有的（基地）和新的甲苯机制，美国西部和东部的夏季一个月进行模型模拟。与目前的对流层排放负担的估计，新的甲苯机制增加每月平均每日最大8小时臭氧的1.0-3.0 ppbv在洛杉矶，波特兰，西雅图，芝加哥，克利夫兰，美国东北部和底特律相比，与基础甲苯化学。它减少了在观测到的臭氧浓度升高时模型对臭氧的平均偏差。虽然新的机制增加了预测的臭氧，但它并没有提高臭氧的生产效率。一项敏感性研究表明，如果甲苯排放量增加，它会进一步增加臭氧。虽然它大大增加了云中二次有机气溶胶，但它对总细颗粒物质量浓度的影响很小。
Abstract. A new condensed toluene mechanism is incorporated into the Community Multiscale Air Quality Modeling system. Model simulations are performed using the CB05 chemical mechanism containing the existing (base) and the new toluene mechanism for the western and eastern US for a summer month. With current estimates of tropospheric emission burden, the new toluene mechanism increases monthly mean daily maximum 8-h ozone by 1.0–3.0 ppbv in Los Angeles, Portland, Seattle, Chicago, Cleveland, northeastern US, and Detroit compared to that with the base toluene chemistry. It reduces model mean bias for ozone at elevated observed ozone concentrations. While the new mechanism increases predicted ozone, it does not enhance ozone production efficiency. A sensitivity study suggests that it can further enhance ozone if elevated toluene emissions are present. While it increases in-cloud secondary organic aerosol substantially, its impact on total fine particle mass concentration is small.