Peroxy radical behavior during the Transport and Chemical Evolution over the Pacific (TRACE-P) campaign as measured aboard the NASA P-3B aircraft

Authors

Christopher A. Cantrell
G. D. Edwards
S. Stephens
R. L. Mauldin
M. A. Zondlo
E. Kosciuch
F. L. Eisele
R. E. Shetter
B. L. Lefer
S. Hall
A. Weinheimer
A. Fried
E. Apel
Y. Kondo
D. R. Blake
N. J. Blake
I. J. Simpson
A. R. Bandy
D. C. Thornton
Brian G. Heikes, University of Rhode IslandFollow
H. B. Singh
W. H. Brune
H. Harder
M. Martinez
D. J. Jacob
M. A. Avery
J. D. Barrick
G. W. Sachse
J. R. Olson
J. H. Crawford
A. D. Clarke

Document Type

Article

Date of Original Version

2003

Department

Oceanography

Abstract

Peroxy radical concentrations were measured aboard the NASA P‐3B aircraft during the Transport and Chemical Evolution over the Pacific (TRACE‐P) campaign in the spring of 2001 and varied in ways that depended on radical production rates and reactive nitrogen concentrations. Measurements of HO₂, HO₂ + RO₂, and OH during this study allowed calculation of radical ratios, examination of functional relationships of these ratios on controlling variables, and comparison with numerical model estimations. Radical production terms show changes in relative contributions at low, middle, and high total production rates that are understandable in terms of systematic variations in the controlling components (trace gas concentrations and photolysis rate coefficients). Ozone tendency calculations indicate net ozone production in the western Pacific basin because the concentrations of critical precursor trace gases (e.g., NO_x, hydrocarbons) are highest there. The dependence of ozone tendency follows the concentration of NO systematically. Peroxy radical levels on the two aircraft (HO₂ + RO₂ on the P‐3B and HO₂ on the DC‐8) during two relatively short prescribed intercomparison periods were in good agreement in one instance and poorer in another given reasonable assumptions about the apportioning of radicals between HO₂ and RO₂. Recommended changes to CH₂O photolysis quantum yields, HO₂ self reaction, and O(¹D) quenching kinetics lead to small changes (

Citation/Publisher Attribution

Cantrell, C. A., et al. (2003), Peroxy radical behavior during the Transport and Chemical Evolution over the Pacific (TRACE‐P) campaign as measured aboard the NASA P‐3B aircraft, J. Geophys. Res., 108, 8797, doi: 10.1029/2003JD003674, D20.

Available at: https://doi.org/10.1029/2003JD003674