An Assessment of HOx Chemistry in the Tropical Pacific Boundary Layer: Comparison of Model Simulations with Observations Recorded during PEM Tropics A |
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| Authors: | G Chen D Davis J Crawford B Heikes D O'Sullivan M Lee F Eisele L Mauldin D Tanner J Collins J Barrick B Anderson D Blake J Bradshaw S Sandholm M Carroll G Albercook A Clarke |
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| Institution: | (1) Georgia Institute of Technology, Atlanta, GA, U.S.A;(2) NASA Langley Research Center, Hampton, VA, U.S.A;(3) University of Rhode Island, Narragansett, RI, U.S.A;(4) U.S. Naval Academy, Annapolis, MD, U.S.A;(5) Korea Ocean Research and Development Institute, Seoul, Korea;(6) National Center for Atmospheric Research, Boulder, CO, U.S.A;(7) University of California at Irvine - Irvine, Irvine, CA, U.S.A;(8) University of Michigan, Ann Arbor, MI, U.S.A;(9) University of Hawaii, Honolulu, HI, U.S.A |
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| Abstract: | Reported are the results from a comparison of OH,H2O2CH3OOH, and O3 observationswithmodel predictions based on current HOx–CH4reaction mechanisms. The field observations are thoserecorded during the NASA GTE field program, PEM-Tropics A. The major focus ofthis paper is on thosedata generated on the NASA P-3B aircraft during a mission flown in the marineboundary layer (MBL) nearChristmas Island, a site located in the central equatorial Pacific (i.e.,2° N, 157° W). Taking advantage of thestability of the southeastern trade-winds, an air parcel was sampled in aLagrangian mode over a significantfraction of a solar day. Analyses of these data revealed excellent agreementbetween model simulated andobserved OH. In addition, the model simulations reproduced the major featuresin the observed diurnalprofiles of H2O2 and CH3OOH. In the case ofO3, the model captured the key observational feature whichinvolved an early morning maximum. An examination of the MBL HOxbudget indicated that the O(1D) + H2Oreaction is the major source of HOx while the major sinks involveboth physical and chemical processes involving the peroxide species,H2O2 and CH3OOH. Overall, the generally goodagreement between modeland observations suggests that our current understanding ofHOx–CH4 chemistry in the tropical MBL isquite good; however, there remains a need to critically examine this chemistrywhen both CH2O and HO2are added to the species measured. |
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| Keywords: | hydroxyl radical marine boundary layer peroxides photochemistry tropical Pacific |
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