Connection of Heterogeneous Chemistry to Atmospheric Oxidation Capacity
Abstract
Atmospheric oxidation capacity was believed to connect uniquely to homogeneous gas-phase chemical processes, e.g. HOx - ROx chemistry and ozone chemistry. Some "new" heterogeneous chemical processes to produce HONO, NO3 radical or OH radical was recently detected in the lab. These processes have the potential to enhance atmospheric oxidation capacity, but are rarely observed in the real atmosphere. In this study, we provided in-situ evidences on dust involved heterogeneous photochemical reactions to induce new particle formation, growth and HONO formation, and biomass burning particles involved heterogeneous pathway to enhance the HONO formation. Moreover, once the dust and biomass burning particles mixed with anthropogenic emission, these heterogeneous processes can be further promoted and feedback to the additional formation of secondary aerosols. These findings challenge the traditional point of view that aerosols are net sinks for the atmospheric oxidation capacity, and indicate possible pathways for the missing sources of radicals in heavy polluted regions.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.A41I..05N
- Keywords:
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- 0317 Chemical kinetic and photochemical properties;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0368 Troposphere: constituent transport and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 3305 Climate change and variability;
- ATMOSPHERIC PROCESSES