OH and chemistry in the North Atlantic free troposphere

• Main Authors: W. H. Brune, I D. Tan, I. F Faloona, L Jaeg, D. J. Jacob, J. Snow, Y. Kondo, R. Shetter, G. W. Sachse, B. Anderson, G. L. Gregory, S. Vay, H. B. Singh, D. D. Davis, J. H. Crawford, D. R. Blake
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: North Atlantic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.456.3609; http://128.95.89.20/~jaegle/group/Publications_files/Geophys Res Lett 1999 Brune.pdf

Abstract. Interactions between atmospheric hydrogen oxides and aircraft nitrogen oxides determine the impact of aircraft exhaust on atmospheric hemistry. To study these interactions, the Subsonic Assessment: Ozone and Nitrogen Oxide Experiment (SONEX) assembled the most complete measurement complement to date for studying HOx (OH and HO:) chemistry in the free troposphere. Observed and modeled H Ox agree on average to within experimental uncertainties (_+40%). However, significant discrepancies occur as a function of NO and at solar zenith angles>70 ø. Some discrepancies appear to be removed by model adjustments to HOx-NOx chemistry, particularly by reducing HO:NO: (PNA) and by including heterogeneous reactions on aerosols and cirrus clouds.