OH and HO2 chemistry in the North Atlantic free troposphere

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 dat...

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Bibliographic Details
Main Authors: Brune, WH, Tan, D, Faloona, IF, Jaeglé, L, Jacob, DJ, Heikes, BG, Snow, J, Kondo, Y, Shetter, R, Sachse, GW, Anderson, B, Gregory, GL, Vay, S, Singh, HB, Davis, DD, Crawford, JH, Blake, DR
Format: Article in Journal/Newspaper
Language:unknown
Published: eScholarship, University of California 1999
Subjects:
Meteorology & Atmospheric Sciences
North Atlantic
Online Access:https://escholarship.org/uc/item/5wm1c5s2
Description
Summary: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 HO2) 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 HO2NO2 (PNA) and by including heterogeneous reactions on aerosols and cirrus clouds.

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