11 Aug 2022
11 Aug 2022
Status: this preprint is open for discussion.

A modern-day Mars climate in the Met Office Unified Model: dry simulations

Danny McCulloch1, Denis Sergeev1, Nathan Mayne1, Matthew Bate1, James Manners2, Ian Boutle2,1, Benjamin Drummond2, and Kristzian Kohary1 Danny McCulloch et al.
  • 1Department of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, UK
  • 2Met Office, FitzRoy Road, Exeter, EX1 3PB, UK

Abstract. We present results from the Met Office Unified Model (UM), a world-leading climate and weather model, adapted to simulate a dry Martian climate. We detail the adaptation of the basic parameterisations and analyse results from two simulations, one with radiatively active mineral dust, and one with radiatively inactive dust. These simulations demonstrate how the radiative effects of dust act to accelerate the winds and create a mid-altitude isothermal layer during the dusty season. We validate our model through comparison with an established Mars model, the Laboratoire de Météorologie Dynamique Mars Planetary Climate Model (PCM), finding good agreement in the seasonal wind and temperature profiles, but discrepancies in the predicted dust mass mixing ratio and conditions at the poles. This study validates the use of the UM for a Martian atmosphere, it highlights how the adaptation of an Earth GCM can be beneficial for existing Mars GCMs and provides insight into the next steps in our development of a new Mars climate model.

Danny McCulloch et al.

Status: open (until 06 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-718', Anonymous Referee #1, 23 Aug 2022 reply
  • RC2: 'Comment on egusphere-2022-718', Anonymous Referee #2, 14 Sep 2022 reply

Danny McCulloch et al.

Data sets

UM datasets and scripts for plot reproduction Danny McCulloch

Danny McCulloch et al.


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Short summary
We present results from the Met Office Unified Model (UM) to study the dry Martian climate. We describe our model setup conditions and run two scenarios, one with dust that interacts with the environment and it does not. We compare both scenarios to results from an existing Mars climate model, the Planetary Climate Model. We find good agreement in winds and air temperatures, but dust amounts differ between models. This study highlights the importance of using the UM for future Mars research.