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Observed and Modeled HOCl Profiles in the Midlatitude Stratosphere: Implication for Ozone LossVertical profiles of stratospheric HOCl calculated with a diurnal steady-state photochemical model that uses currently recommended reaction rates and photolysis cross sections underestimate observed profiles of HOCl obtained by two balloon-borne instruments, FIRS-2 (a far-infrared emission spectrometer) and MkIV (a mid-infrared, solar absorption spectrometer). Considerable uncertainty (a factor of two) persists in laboratory measurements of the rate constant (k(sub 1)) for the reaction ClO + HO2 yields HOCl + O2. Agreement between modeled and measured HOCl can be attained using a value of k(sub 1) from Stimpfle et al. (1979) that is about a factor-of-two faster than the currently recommended rate constant. Comparison of modeled and measured HOCl suggests that models using the currently recommended value for k(sub 1) may underestimate the role of the HOCl catalytic cycle for ozone depletion, important in the midlatitude lower stratosphere.
Document ID
20080046997
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
Authors
Kovalenko, L. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jucks, K. W.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Salawitch, R. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Toon, G. C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Blavier, J. F.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Johnson, D. G.
(NASA Langley Research Center Hampton, VA, United States)
Kleinbohl, A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Livesey, N. J .
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Margitan, J. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Pickett, H. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Santee, M. L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Sen, B.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Stachnik, R. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Waters, J. W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
October 2, 2007
Publication Information
Publication: Geophysical Research Letters
Publisher: American Geophysical Union
Volume: 34
ISSN: 0094-8276
Subject Category
Meteorology And Climatology
Distribution Limits
Public
Copyright
Other
Keywords
temperature dependence
reaction kinetics

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