The role of chlorine chemistry in Antarctic ozone loss: Implications of new kinetic data

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/GL017i003p00255· OSTI ID:5456560

Rodriguez, J M; Ko, M K.W.; Sze, Nien Dak ^[1]

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1. Atmospheric and Environmental Research, Inc., Cambridge, MA (USA)

New kinetic data yielding a slower formation rate and larger absorption cross sections of C{ell}{sub 2}O{sub 2} are incorporated into a photochemical model to reassess the role of chlorine chemistry in accounting for the ozone reductions derived from TOMS observations in different regions of the Antarctic polar vortex during 1987. The model is further constrained by existing measurements from the Airborne Antarctic Ozone Experiment (AAOE) and the National Ozone Expedition (NOZE)-II. Calculated concentrations of C{ell}O based on the new kinetic data increase by almost a factor of two between the collar and core regions of the vortex during the second half of September. As a result of the higher concentrations of C{ell}O, the calculated ozone reductions in the vortex core appear to be still consistent with the TOMS observations in spite of the slower rate for the self-reaction of C{ell}O. The agreement in the collar region is poorer. However, uncertainties in mixing, possible spatial inhomogeneities in both C{ell}O and O{sub 3}, the lack of more extensive data, and the uncertainties in the rate data and observations preclude determination of whether additional processes are required to account for the observed ozone removal in the collar region.

• OSTI ID: 5456560
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 17:3; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ABSORPTION
ANTARCTIC REGIONS
ANTARCTICA
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
CHLORINE OXIDES
DIMERS
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
EQUATIONS
HALOGEN COMPOUNDS
KINETIC EQUATIONS
KINETICS
LAYERS
LOSSES
OXIDES
OXYGEN COMPOUNDS
OZONE
OZONE LAYER
PHOTOCHEMICAL REACTIONS
POLAR REGIONS
REACTION KINETICS
STRATOSPHERE
SYNTHESIS