OH and HO<sub>2</sub> chemistry in the North Atlantic free troposphere
Article 1999 en
Authors
WB
W. H. Brune
DT
D. Tan
IF
I. Faloona
Abstract
1 min read
Interactions between atmospheric hydrogen oxides and aircraft nitrogen oxides determine the impact of aircraft exhaust on atmospheric chemistry. To study these interactions, the Subsonic Assessment: Ozone and Nitrogen Oxide Experiment (SONEX) assembled the most complete measurement complement to date for studying HO x (OH and HO 2 ) chemistry in the free troposphere. Observed and modeled HO x agree on average to within experimental uncertainties (±40%). However, significant discrepancies occur as a function of NO and at solar zenith angles >70°. Some discrepancies appear to be removed by model adjustments to HO x ‐NO x chemistry, particularly by reducing HO 2 NO 2 (PNA) and by including heterogeneous reactions on aerosols and cirrus clouds.
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