Implementation of a comprehensive ice crystal formation parameterization for cirrus and mixed-phase clouds in the EMAC model (based on MESSy 2.53)
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Published:2018-10-05
Issue:10
Volume:11
Page:4021-4041
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Bacer Sara, Sullivan Sylvia C.ORCID, Karydis Vlassis A., Barahona DonifanORCID, Krämer MartinaORCID, Nenes AthanasiosORCID, Tost HolgerORCID, Tsimpidi Alexandra P., Lelieveld JosORCID, Pozzer AndreaORCID
Abstract
Abstract. A comprehensive ice nucleation parameterization has been
implemented in the global chemistry-climate model EMAC to improve the
representation of ice crystal number concentrations (ICNCs). The
parameterization of Barahona and Nenes (2009, hereafter BN09) allows for the
treatment of ice nucleation taking into account the competition for water
vapour between homogeneous and heterogeneous nucleation in cirrus clouds.
Furthermore, the influence of chemically heterogeneous, polydisperse aerosols
is considered by applying one of the multiple ice nucleating particle
parameterizations which are included in BN09 to compute the heterogeneously
formed ice crystals. BN09 has been modified in order to consider the
pre-existing ice crystal effect and implemented to operate both in the cirrus
and in the mixed-phase regimes. Compared to the standard EMAC
parameterizations, BN09 produces fewer ice crystals in the upper troposphere
but higher ICNCs in the middle troposphere, especially in the Northern
Hemisphere where ice nucleating mineral dust particles are relatively
abundant. Overall, ICNCs agree well with the observations, especially in cold
cirrus clouds (at temperatures below 205 K), although they are
underestimated between 200 and 220 K. As BN09 takes into account
processes which were previously neglected by the standard version of the
model, it is recommended for future EMAC simulations.
Publisher
Copernicus GmbH
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