Articles | Volume 18, issue 22
https://doi.org/10.5194/acp-18-16809-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-18-16809-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Nov 2018
Research article |
| 28 Nov 2018
| 28 Nov 2018
Cloud impacts on photochemistry: building a climatology of photolysis rates from the Atmospheric Tomography mission
Samuel R. Hall
Atmospheric Chemistry Observations and Modeling Laboratory, National
Center for Atmospheric Research, Boulder, CO 80301, USA
Kirk Ullmann
Atmospheric Chemistry Observations and Modeling Laboratory, National
Center for Atmospheric Research, Boulder, CO 80301, USA
Department of Earth System Science, University of California,
Irvine, CA, USA
Clare M. Flynn
Department of Earth System Science, University of California,
Irvine, CA, USA
Lee T. Murray
Department of Earth and Environmental Sciences, University of
Rochester, Rochester, NY, USA
Arlene M. Fiore
Department of Earth and Environmental Sciences, Columbia
University, New York, NY, USA
Lamont-Doherty Earth Observatory of Columbia University, Palisades,
NY, USA
Gustavo Correa
Department of Earth and Environmental Sciences, Columbia
University, New York, NY, USA
Sarah A. Strode
NASA Goddard Space Flight Center, Greenbelt, MD, USA
Universities Space Research Association (USRA), GESTAR, Columbia,
MD, USA
Stephen D. Steenrod
NASA Goddard Space Flight Center, Greenbelt, MD, USA
Universities Space Research Association (USRA), GESTAR, Columbia,
MD, USA
Jean-Francois Lamarque
Atmospheric Chemistry Observations and Modeling Laboratory, National
Center for Atmospheric Research, Boulder, CO 80301, USA
Jonathan Guth
Centre National de Recherches Météorologiques,
CNRS-Météo-France, UMR 3589, Toulouse, France
Béatrice Josse
Centre National de Recherches Météorologiques,
CNRS-Météo-France, UMR 3589, Toulouse, France
Johannes Flemming
European Centre for Medium-Range Weather Forecasts, Reading, UK
Vincent Huijnen
Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
N. Luke Abraham
Department of Chemistry, University of Cambridge, Cambridge, UK
National Centre for Atmospheric Science, Leeds, UK
Alex T. Archibald
Department of Chemistry, University of Cambridge, Cambridge, UK
National Centre for Atmospheric Science, Leeds, UK
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Latest update: 27 Nov 2025
Short summary
Photolysis (J rates) initiates and drives atmospheric chemistry, and Js are perturbed by factors of 2 by clouds. The NASA Atmospheric Tomography (ATom) Mission provides the first comprehensive observations on how clouds perturb Js through the remote Pacific and Atlantic basins. We compare these cloud-perturbation J statistics with those from nine global chemistry models. While basic patterns agree, there is a large spread across models, and all lack some basic features of the observations.
Photolysis (J rates) initiates and drives atmospheric chemistry, and Js are perturbed by factors...
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