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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2020-50
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-50
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 08 Apr 2020

Submitted as: model description paper | 08 Apr 2020

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A revised version of this preprint was accepted for the journal GMD and is expected to appear here in due course.

A new parameterization of ice heterogeneous nucleation coupled to aerosol chemistry in WRF-Chem model version 3.5.1: evaluation through the ISDAC measurements

Setigui Aboubacar Keita1, Eric Girard1,, Jean-Christophe Raut1,2, Maud Leriche1,3, Jean-Pierre Blanchet1, Jacques Pelon2, Tatsuo Onishi2, and Ana Cirisan1 Setigui Aboubacar Keita et al.
  • 1ESCER Centre, Department of Earth and Atmospheric Sciences, Université du Québec à Montréal, H3C 3P8, Montréal,Québec, Canada
  • 2LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France
  • 3Laboratoire d’Aérologie (LA), CNRS, Université Paul Sabatier, Toulouse, France
  • deceased, 10 July 2017

Abstract. In the Arctic, during polar night and early spring, ice clouds are separated into two leading types: (1) TIC1 clouds characterized by large concentration of very small crystals, and TIC2 clouds characterized by low concentration of large ice crystals. Using suitable parameterization of heterogeneous ice nucleation is essential for properly representing ice cloud in meteorological and climate model and subsequently understanding their interactions with aerosols and radiation. Here, we describe a new parameterization for ice crystals formation by heterogeneous nucleation coupled to aerosols chemistry in WRF-Chem. The parameterization is implemented in the Milbrandt and Yau’s two-moment cloud microphysics scheme and we assess how the WRF-Chem model responds to the real time interaction between chemistry and the new parameterization. Well-documented reference cases provided us in situ data from the spring 2008 Indirect and Semi-Direct Aerosol Campaign (ISDAC) campaign over Alaska. Our analysis reveals that the new parameterization clearly improves the representation of the IWC in polluted or unpolluted air masses and shows the poor performance of the reference parameterization in representing ice clouds with low IWC. The new parameterization is, thus able to represent TIC1 and TIC2 microphysical characteristics at the top of the clouds were heterogeneous ice nucleation is most likely occurring even knowing the bias of simulated aerosols by WRF-Chem over Arctic.

Setigui Aboubacar Keita et al.

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Setigui Aboubacar Keita et al.

Setigui Aboubacar Keita et al.

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