Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2017-89
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Development and technical paper
08 May 2017
Review status
This discussion paper is under review for the journal Geoscientific Model Development (GMD).
Improvements to the WRF-Chem model for quasi-hemispheric simulations of aerosols and ozone in the Arctic
Louis Marelle1,2,a, Jean-Christophe Raut1, Kathy S. Law1, Larry K. Berg3, Jerome D. Fast3, Richard C. Easter3, Manish Shrivastava3, and Jennie L. Thomas1 1LATMOS/IPSL, UPMC Univ. Paris 06 Sorbonne Universités, UVSQ, CNRS, Paris, France
2TOTAL S.A, Direction Scientifique, Tour Michelet, 92069 Paris La Défense, France
3Pacific Northwest National Laboratory, Richland, WA, USA
anow at: Center for International Climate and Environmental Research, Oslo, Norway
Abstract. In this study, the WRF-Chem regional model is updated to improve simulated short-lived pollutants (aerosols, ozone) in the Arctic. Specifically, we include in WRF-Chem 3.5.1 (with SAPRC-99 gas-phase chemistry and MOSAIC aerosols) (1) a correction to the sedimentation of aerosols, (2) dimethylsulfide (DMS) oceanic emissions and gas-phase chemistry, (3) an improved representation of the dry deposition of trace gases over seasonal snow, (4) an UV-albedo dependence on snow and ice cover for photolysis calculations. We also (5) correct the representation of surface temperatures over melting ice in the Noah Land Surface Model and (6) couple and further test the recent KF-CuP (Kain-Fritsch + Cumulus Potential) cumulus parameterization that includes the effect of cumulus clouds on aerosols and trace gases. The updated model is used to perform quasi-hemispheric simulations of aerosols and ozone, which are evaluated against surface measurements of black carbon (BC), sulfate, and ozone, and airborne measurements of BC in the Arctic. The updated model shows significant improvements in terms of seasonal aerosol cycles at the surface, root mean square errors (RMSE) for surface ozone and aerosols and BC aloft, compared to the base version of the model and to previous large-scale evaluations of WRF-Chem in the Arctic. These improvements are mostly due to the inclusion of cumulus effects on aerosols and trace gases in KF-CuP (improved RMSE for surface BC and BC profiles, surface sulfate and surface ozone), the improved surface temperatures over sea ice (surface ozone, BC, and sulfate), and the updated trace gas deposition and UV-albedo over snow and ice (improved RMSE and correlation for surface ozone). DMS emissions and chemistry improve surface sulfate at all Arctic sites except Zeppelin, and correcting aerosol sedimentation has little influence on aerosols except in the upper troposphere.

Citation: Marelle, L., Raut, J.-C., Law, K. S., Berg, L. K., Fast, J. D., Easter, R. C., Shrivastava, M., and Thomas, J. L.: Improvements to the WRF-Chem model for quasi-hemispheric simulations of aerosols and ozone in the Arctic, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2017-89, in review, 2017.
Louis Marelle et al.
Louis Marelle et al.
Louis Marelle et al.

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Short summary
We develop the WRF-Chem model to improve simulations of aerosols and ozone in the Arctic. Both species are important air pollutants and climate forcers, but models often struggle to reproduce observations in the Arctic. Our developments concern pollutant emissions, mixing, chemistry and removal, including processes related to snow and sea-ice. The effect of these changes are quantitatively validated against observations, showing significant improvements compared to the original model.
We develop the WRF-Chem model to improve simulations of aerosols and ozone in the Arctic. Both...
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