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Abstract

The oxidizing capacity of the global atmosphere is largely determined by hydroxyl (OH) radicals and is diagnosed by analyzing methyl chloroform (CH3CCl3) measurements. Previously, large year-to-year changes in global mean OH concentrations have been inferred from such measurements, suggesting that the atmospheric oxidizing capacity is sensitive to perturbations by widespread air pollution and natural influences. We show how the interannual variability in OH has been more precisely estimated from CH3CCl3 measurements since 1998, when atmospheric gradients of CH3CCl3 had diminished as a result of the Montreal Protocol. We infer a small interannual OH variability as a result, indicating that global OH is generally well buffered against perturbations. This small variability is consistent with measurements of methane and other trace gases oxidized primarily by OH, as well as global photochemical model calculations.
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Information & Authors

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Published In

Science
Volume 331Issue 60137 January 2011
Pages: 67 - 69
PubMed: 21212353

History

Received: 10 September 2010
Accepted: 22 November 2010

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Acknowledgments

We thank C. Siso, B. Miller, L. Miller, D. Mondeel, L. Bruhwiler, P. Novelli, B. Weatherhead, J. W. Elkins, J. H. Butler, station personnel involved with sampling flasks, C. M. Spivakovsky, R. G. Prinn, and other AGAGE scientists, P. Bergamaschi, and J.-F. Meirink. Supported in part by the Atmospheric Composition and Climate Program of NOAA’s Climate Program Office and by the Stichting Nationale Computerfaciliteiten (National Computing Facilities Foundation).

Authors

Affiliations

S. A. Montzka* [email protected]
NOAA Earth System Research Laboratory, Boulder, CO 80305, USA.
M. Krol
Institute for Marine and Atmospheric Research Utrecht, University of Utrecht, 3584 CC Utrecht, Netherlands.
Meteorology and Air Quality Group, Wageningen University, 6708 PB Wageningen, Netherlands.
E. Dlugokencky
NOAA Earth System Research Laboratory, Boulder, CO 80305, USA.
B. Hall
NOAA Earth System Research Laboratory, Boulder, CO 80305, USA.
P. Jöckel
Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, D-55128 Mainz, Germany.
J. Lelieveld
Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, D-55128 Mainz, Germany.
Cyprus Institute, Nicosia 1645, Cyprus.

Notes

*To whom correspondence should be addressed. E-mail: [email protected]
Present address: Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82234 Wessling, Germany.

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Science
Volume 331|Issue 6013
7 January 2011
Submission history
Received:10 September 2010
Accepted:22 November 2010
Published in print:7 January 2011
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