Model Representation of Secondary Organic Aerosol in CMAQv4.7
Model Representation of Secondary Organic Aerosol in CMAQv4.7
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DOI：
10.1021/es100636q
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发表时间：
2010-11-15
影响因子：
11.4
通讯作者：
Houyoux, Marc
中科院分区：
文献类型：
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作者：
Carlton, Annmarie G.;Bhave, Prakash V.;Houyoux, Marc
许多科学升级的二次有机气溶胶（SOA）的代表性被纳入社区多尺度空气质量（CMAQ）建模系统。添加包括几个最近确定的SOA前体：苯，异戊二烯和倍半萜烯;和途径：在云中氧化乙二醛和甲基乙二醛，颗粒相低聚反应，酸增强异戊二烯SOA。氮氧化物依赖的芳族SOA的产量也加入了沿着与蒸发和有机质碳比的新的经验测量。第一次，这些SOA的前体，途径和经验参数同时包括在空气质量模型的年度模拟跨越美国大陆的CMAQ模型的二次有机碳（OCsec）与半经验估计筛选从165个常规监测站点在美国各地的比较表明，新的SOA模块大大提高了模型的性能。最显着的改善发生在美国中部和东南部的区域平均的时间相关性（r）之间的建模和半经验OC秒增加从-0.5到0.8和-0.3到0.8，分别时，新的SOA模块。冬季OCsec的结果在美国大陆的所有地区都有所改善，并且生物SOA的季节性和区域性模式得到了更好的体现。
Numerous scientific upgrades to the representation of secondary organic aerosol (SOA) are incorporated into the Community Multiscale Air Quality (CMAQ) modeling system. Additions include several recently identified SOA precursors: benzene, isoprene, and sesquiterpenes; and pathways: in-cloud oxidation of glyoxal and methylglyoxal, particle-phase oligomerization, and acid enhancement of isoprene SOA. NOx-dependent aromatic SOA yields are also added along with new empirical measurements of the enthalpies of vaporization and organic mass-to-carbon ratios. For the first time, these SOA precursors, pathways and empirical parameters are included simultaneously in an air quality model for an annual simulation spanning the continental U.S. Comparisons of CMAQ-modeled secondary organic carbon (OCsec) with semiempirical estimates screened from 165 routine monitoring sites across the U.S. indicate the new SOA module substantially improves model performance. The most notable improvement occurs in the central and southeastern U.S. where the regionally averaged temporal correlations (r) between modeled and semiempirical OCsec increase from -0.5 to 0.8 and -0.3 to 0.8, respectively, when the new SOA module is employed. Wintertime OCsec results improve in all regions of the continental U.S. and the seasonal and regional patterns of biogenic SOA are better represented.