References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-32003-2011

Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere

Saiz-Lopez

¹ Lamarque

J.-F.

² Kinnison

D. E.

² Tilmes

² Ordóñez

¹ Orlando

J. J.

² Conley

A. J.

² Plane

J. M. C.

³ Mahajan

A. S.

¹ Sousa Santos

⁴ Atlas

E. L.

⁵ Blake

D. R.

⁶ Sander

S. P.

⁷ Schauffler

⁸ Thompson

A. M.

⁹ Brasseur

¹⁰

Laboratory for Atmospheric and Climate Science, CSIC, Toledo, Spain

Atmospheric Chemistry Division, NCAR, Boulder, CO, USA

School of Chemistry, University of Leeds, Leeds, UK

Institute for Atmospheric and Climate Science, ETH, Zurich, Switzerland

Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA

Department of Chemistry, University of California, Irvine, CA, USA

Jet Propulsion Laboratory, California Institute of Technology, CA, USA

Earth Observing Laboratory, NCAR, Boulder, CO, USA

Department of Meteorology, Pennsylvania State University, Pennsylvania, USA

Climate Service Center, Hamburg, Germany

06 12 2011

11 12 32003 32029

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We have integrated observations of tropospheric ozone, very short-lived (VSL) halocarbons and reactive iodine and bromine species from a wide variety of tropical data sources with the global CAM-Chem chemistry-climate model and offline radiative transfer calculations to compute the contribution of halogen chemistry to ozone loss and associated radiative impact in the tropical marine troposphere. The inclusion of tropospheric halogen chemistry in CAM-Chem leads to an annually averaged depletion of around 10% (~2.5 Dobson units) of the tropical tropospheric ozone column, with largest effects in the middle to upper troposphere.This depletion contributes approximately −0.10 W m−2 to the radiative flux at the tropical tropopause. This negative flux is of similar magnitude to the ~0.33 W m−2 contribution of tropospheric ozone to present-day radiative balance as recently estimated from satellite observations. We find that the implementation of oceanic halogen sources and chemistry in climate models is an important component of the natural background ozone budget and we suggest that it needs to be considered when estimating both preindustrial ozone baseline levels and long term changes in tropospheric ozone.

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