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Outline
As a key precursor to secondary air pollution, the atmospheric oxidation mechanism of volatile organic compounds (VOCs) is very complex, and the current model simulation generally has the problem that the total carbon mass of VOCs conversion process is difficult to close. Aiming for a more comprehensive understanding of the oxidation mechanism of VOCs, this study constructed a Lagrangian simulation system based on the zero-dimensional box model, using 6 widely used atmospheric chemical mechanisms, selecting 4 representative VOCs species and 56 PAMS (Photochemical Assessment Monitoring Station) combined air masses, and systematically carrying out the carbon balance simulation and evaluation of the generational oxidation process. The results showed that there was a significant carbon mass loss phenomenon (7.5%~76%) in the simulation of the six chemical mechanisms, and there were obvious differences between different mechanisms and components. Among them, MCMv3.3.1 had the lowest degree of carbon deletion and the highest OH exposure corresponding to the loss of total carbon mass. In the oxidized carbon balance of a single species, the carbon loss was the most serious during the oxidation of n-pentane, followed by the oxidation process of toluene. The occurrence of total carbon mass loss is mainly related to the chemical consumption of the first generation products and the generation of the second generation products. The results of this study provide an important scientific basis for improving the oxidation mechanism of organic species and improving the integrity of chemical mechanism.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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