Reactive aldehyde chemistry explains the missing source of hydroxyl radicals.

ABSTRACT: Hydroxyl radicals (OH) determine the tropospheric self-cleansing capacity, thus regulating air quality and climate. However, the state-of-the-art mechanisms still underestimate OH at low nitrogen oxide and high volatile organic compound regimes even considering the latest isoprene chemistry. Here we propose that the reactive aldehyde chemistry, especially the autoxidation of carbonyl organic peroxy radicals (R(CO)O₂) derived from higher aldehydes, is a noteworthy OH regeneration mechanism that overwhelms the contribution of the isoprene autoxidation, the latter has been proved to largely contribute to the missing OH source under high isoprene condition. As diagnosed by the quantum chemical calculations, the R(CO)O₂ radicals undergo fast H-migration to produce unsatura

SUBMITTER: Yang X 

PROVIDER: S-EPMC10883920 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature