Articles | Volume 4, issue 1
Geosci. Model Dev., 4, 169–182, 2011

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Geosci. Model Dev., 4, 169–182, 2011

Development and technical paper 11 Mar 2011

Development and technical paper | 11 Mar 2011

Simulation of polar stratospheric clouds in the chemistry-climate-model EMAC via the submodel PSC

O. Kirner1, R. Ruhnke2, J. Buchholz-Dietsch4, P. Jöckel3, C. Brühl4, and B. Steil4 O. Kirner et al.
  • 1Karlsruhe Institute of Technology, Steinbuch Centre for Computing (SCC), Karlsruhe, Germany
  • 2Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research (IMK), Karlsruhe, Germany
  • 3Deutsches Zentrum für Luft- u. Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Weßling, Germany
  • 4Max Planck Institute for Chemistry (MPIC), Mainz, Germany

Abstract. The submodel PSC of the ECHAM5/MESSy Atmospheric Chemistry model (EMAC) has been developed to simulate the main types of polar stratospheric clouds (PSC). The parameterisation of the supercooled ternary solutions (STS, type 1b PSC) in the submodel is based on Carslaw et al. (1995b), the thermodynamic approach to simulate ice particles (type 2 PSC) on Marti and Mauersberger (1993). For the formation of nitric acid trihydrate (NAT) particles (type 1a PSC) two different parameterisations exist. The first is based on an instantaneous thermodynamic approach from Hanson and Mauersberger (1988), the second is new implemented and considers the growth of the NAT particles with the aid of a surface growth factor based on Carslaw et al. (2002). It is possible to choose one of this NAT parameterisation in the submodel. This publication explains the background of the submodel PSC and the use of the submodel with the goal of simulating realistic PSC in EMAC.