Role of Heterogeneous Reactions in the Atmospheric Oxidizing Capacity in Island Environments.

ABSTRACT: The source of nitrous acid (HONO) and its importance in island or marine environments are poorly understood. Herein, based on comprehensive field measurements at a hilltop on Corsica Island, we find an inverse diel variation of HONO with higher concentrations during daytime. Night-time HONO budget analysis indicates significant HONO formation during air mass transport along the hillside. In the daytime, although photosensitized NO₂ uptake on the ground and NO + OH make considerable contributions (26% and 5%, respectively), a large part of HONO formation (67%, 320 pptv h^-1) still cannot be explained with state-of-the-art parametrization. Nevertheless, photosensitized heterogeneous NO₂ reactions are likely to account for the missing source, due to underestima

SUBMITTER: Xue C 

PROVIDER: S-EPMC11840933 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature