Balloon‐borne in situ measurements of CLO and ozone: Implications for heterogeneous chemistry and mid‐latitude ozone loss

L. M. Avallone; D. W. Toohey; W. H. Brune; R. J. Salawitch; A. E. Dessler; J. G. Anderson

doi:10.1029/93GL01938

Balloon‐borne in situ measurements of CLO and ozone: Implications for heterogeneous chemistry and mid‐latitude ozone loss

L. M. Avallone, D. W. Toohey, W. H. Brune, R. J. Salawitch, A. E. Dessler, J. G. Anderson

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Abstract

In situ measurements of chlorine oxide (ClO) obtained on 31 March 1991 with a new balloon‐borne instrument are compared to results from a photochemical model which incorporates hydrolysis of N₂O₅ on sulfate aerosols. With the addition of this process, there is better agreement between calculation and measurement over most of the profile, except below 20 km where observed ClO is greater by as much as a factor of four. In a model which is constrained to reproduce the observed ClO below 20 km, ozone loss by catalytic cycles involving halogen oxides becomes larger than that from NO_x, which would dominate under gas‐phase or standard heterogeneous conditions.

Original language	English (US)
Pages (from-to)	1795-1798
Number of pages	4
Journal	Geophysical Research Letters
Volume	20
Issue number	17
DOIs	https://doi.org/10.1029/93GL01938
State	Published - Sep 3 1993

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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title = "Balloon‐borne in situ measurements of CLO and ozone: Implications for heterogeneous chemistry and mid‐latitude ozone loss",

abstract = "In situ measurements of chlorine oxide (ClO) obtained on 31 March 1991 with a new balloon‐borne instrument are compared to results from a photochemical model which incorporates hydrolysis of N2O5 on sulfate aerosols. With the addition of this process, there is better agreement between calculation and measurement over most of the profile, except below 20 km where observed ClO is greater by as much as a factor of four. In a model which is constrained to reproduce the observed ClO below 20 km, ozone loss by catalytic cycles involving halogen oxides becomes larger than that from NOx, which would dominate under gas‐phase or standard heterogeneous conditions.",

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T2 - Implications for heterogeneous chemistry and mid‐latitude ozone loss

AU - Avallone, L. M.

AU - Toohey, D. W.

AU - Brune, W. H.

AU - Salawitch, R. J.

AU - Dessler, A. E.

AU - Anderson, J. G.

PY - 1993/9/3

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AB - In situ measurements of chlorine oxide (ClO) obtained on 31 March 1991 with a new balloon‐borne instrument are compared to results from a photochemical model which incorporates hydrolysis of N2O5 on sulfate aerosols. With the addition of this process, there is better agreement between calculation and measurement over most of the profile, except below 20 km where observed ClO is greater by as much as a factor of four. In a model which is constrained to reproduce the observed ClO below 20 km, ozone loss by catalytic cycles involving halogen oxides becomes larger than that from NOx, which would dominate under gas‐phase or standard heterogeneous conditions.

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Balloon‐borne in situ measurements of CLO and ozone: Implications for heterogeneous chemistry and mid‐latitude ozone loss

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