OH, HO 2 , and NO in two biomass burning plumes: Sources of HO  x   and implications for ozone production | Zendy

Folkins Ian | Zendy; Wennberg P. O. | Zendy; Hanisco T. F. | Zendy; Anderson J. G. | Zendy; Salawitch R. J. | Zendy

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OH, HO 2 , and NO in two biomass burning plumes: Sources of HO x and implications for ozone production

Author(s) -

Folkins Ian,

Wennberg P. O.,

Hanisco T. F.,

Anderson J. G.,

Salawitch R. J.

Publication year - 1997

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/97gl03047

Subject(s) - ozone , atmospheric sciences , troposphere , photodissociation , environmental science , stratosphere , atmosphere (unit) , biomass burning , plume , atmospheric chemistry , environmental chemistry , meteorology , chemistry , aerosol , physics , photochemistry

The ER‐2 made two descents through upper tropospheric biomass burning plumes during ASHOE/MAESA. HO x (= OH + HO 2 ) concentrations are largely self‐limited outside the plumes, but become progressively more limited by reactions with NO x (= NO + NO 2 ) at the higher NO x concentrations inside the plumes. Sources of HO x in addition to H 2 O and CH 4 oxidation are required to balance the known HO x sinks both in the plumes and in the background upper troposphere. HO x concentrations were consistently underestimated by a model constrained by observed NO x concentrations. The size of the model underestimate is reduced when acetone photolysis is included. Models which do not include the additional HO x sources required to balance the HO x budget are likely to underestimate ozone production rates.

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