A comparison of chemical mechanisms based on TRAMP-2006 field data |
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| Authors: | Shuang Chen Xinrong Ren Jingqiu Mao Zhong Chen William H Brune Barry Lefer Bernhard Rappenglück James Flynn Jennifer Olson James H Crawford |
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| Institution: | 1. Shanghai Key Laboratory of Meteorology and Health, Shanghai 200030, China;2. Shanghai Meteorological Service, Shanghai 200030, China;3. Key Laboratory of Aerosol Science and Technology, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, China;4. CAS Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen 361021, China;5. National Center for Atmospheric Research (NCAR), Boulder 80303, USA;6. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland;1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China;2. Chengdu Academy of Environmental Sciences, Chengdu, China;3. Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, 100871, Beijing, China |
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| Abstract: | A comparison of a model using five widely known mechanisms (RACM, CB05, LaRC, SAPRC-99, SAPRC-07, and MCMv3.1) has been conducted based on the TexAQS II Radical and Aerosol Measurement Project (TRAMP-2006) field data in 2006. The concentrations of hydroxyl (OH) and hydroperoxy (HO2) radicals were calculated by a zero-dimensional box model with each mechanism and then compared with the OH and HO2 measurements. The OH and HO2 calculated by the model with different mechanisms show similarities and differences with each other and with the measurements. First, measured OH and HO2 are generally greater than modeled for all mechanisms, with the median modeled-to-measured ratios ranging from about 0.8 (CB05) to about 0.6 (SAPRC-99). These differences indicate that either measurement errors, the effects of unmeasured species or chemistry errors in the model or the mechanisms, with some errors being independent of the mechanism used. Second, the modeled and measured ratios of HO2/OH agree when NO is about 1 ppbv, but the modeled ratio is too high when NO was less and too low when NO is more, as seen in previous studies. Third, mechanism–mechanism HOx differences are sensitive to the environmental conditions – in more polluted conditions, the mechanism–mechanism differences are less. This result suggests that, in polluted conditions, the mechanistic details are less important than in cleaner conditions, probably because of the dominance of reactive nitrogen chemistry under polluted conditions. |
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