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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-31
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Model description paper
05 Apr 2017
Review status
A revision of this discussion paper is under review for the journal Geoscientific Model Development (GMD).
The Sectional Stratospheric Sulfate Aerosol module S3A-v1 within the LMDZ general circulation model: Description and evaluation against stratospheric aerosol observations
Christoph Kleinschmitt1, Olivier Boucher2, Slimane Bekki3, François Lott4, and Ulrich Platt1 1Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
2Institut Pierre-Simon Laplace, CNRS/UPMC, 4 Place Jussieu, 75252 Paris Cedex 05, France
3Laboratoire Atmosphères Milieux Observations Spatiales, Institut Pierre-Simon Laplace, CNRS / UVSQ, 11 Boulevard d’Alembert, 78280 Guyancourt, France
4Laboratoire de Météorologie Dynamique, Institut Pierre-Simon Laplace, CNRS / ENS, 24 Rue Lhomond, 75231 Paris Cedex 05, France
Abstract. Stratospheric aerosols play an important role in the climate system by affecting the Earth's radiative budget and the capabilities to simulate them interactively within global models are continuously improving. It is important to represent accurately both aerosol microphysical and atmospheric dynamical processes because together they affect the size distribution and the residence time of the aerosol particles in the stratosphere. The newly developed LMDZ-S3A model presented in this article uses a sectional approach for sulfate particles in the stratosphere and includes all the relevant microphysical processes, allowing full interaction between aerosol radiative effects and atmospheric dynamics. It reasonably reproduces aerosol observations in periods of low (background) and high (volcanic) stratospheric sulfate loading. Thus, it may serve as a tool to study the climate impacts of volcanic eruptions, as well as the deliberate anthropogenic injection of aerosols into the stratosphere, which has been proposed as a method of geoengineering to abate global warming.

Citation: Kleinschmitt, C., Boucher, O., Bekki, S., Lott, F., and Platt, U.: The Sectional Stratospheric Sulfate Aerosol module S3A-v1 within the LMDZ general circulation model: Description and evaluation against stratospheric aerosol observations, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-31, in review, 2017.
Christoph Kleinschmitt et al.
Christoph Kleinschmitt et al.
Christoph Kleinschmitt et al.

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Short summary
Stratospheric aerosols play an important role in the climate system by affecting the Earth's radiative budget. In this article we present the newly developed LMDZ-S3A model and assess its performance against observations in periods of low and high aerosol loading. The model may serve as a tool to study the climate impacts of volcanic eruptions, as well as the deliberate injection of aerosols into the stratosphere, which has been proposed as a method of geoengineering to abate global warming.
Stratospheric aerosols play an important role in the climate system by affecting the Earth's...
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