OH and HO2 chemistry in the North Atlantic free troposphere

Authors

William H. Brune, Pennsylvania State University
D. Tan, Pennsylvania State University
I. F. Faloona, Pennsylvania State University
L. Jaeglé, Harvard University
D. J. Jacob, Harvard University
B. G. Heikes, University of Rhode Island
J. Snow, University of Rhode Island
Y. Kondo
R. Shetter, The Earth and Sun Systems Laboratory
G. W. Sachse, NASA Langley Research Center
B. Anderson, NASA Langley Research Center
G. L. Gregory, NASA Langley Research Center
S. Vay, NASA Langley Research Center
H. B. Singh, NASA Ames Research Center
D. D. Davis, Georgia Institute of Technology
J. H. Crawford, NASA Langley Research Center
D. R. Blake, University of California, Irvine

Document Type

Article

Date of Original Version

10-15-1999

Abstract

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.

Publication Title, e.g., Journal

Geophysical Research Letters

Volume

26

Issue

20

Citation/Publisher Attribution

Brune, William H., D. Tan, I. F. Faloona, L. Jaeglé, D. J. Jacob, B. G. Heikes, 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, and D. R. Blake. "OH and HO2 chemistry in the North Atlantic free troposphere." Geophysical Research Letters 26, 20 (1999). doi: 10.1029/1999GL900549.