Matthew Bate’s scientific contributions

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Publications (3)


A modern-day Mars climate in the Met Office Unified Model: dry simulations
  • Preprint
  • File available

February 2023

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29 Reads

Danny McCulloch

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Nathan Mayne

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Kristzian Kohary

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 M\'et\'eorologie Dynamique planetary climate model (PCM), finding good agreement in the seasonal wind and temperature profiles but with 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, highlighting how the adaptation of an Earth general circulation model (GCM) can be beneficial for existing Mars GCMs and provides insight into the next steps in our development of a new Mars climate model.

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Overview three-dimensional plot of example output during Southern Hemisphere summer (Ls=260∘). Included is a segment of the extracted regional dust layer as an isosurface, wind vectors at 1 km height (arrows) and orography. Grid cells are cropped to 30 km. Higher-resolution GIF and code are available at https://github.com/dannymcculloch/3d_Mars_gif (last access: 16 January 2023). Made with PyVista .
Original MOLA elevation data (a) compared to the regridded elevation data used in the UM (b). Colour scales are matching between plots.
Dust size probability distribution used for the UM following . Dust bin ranges are shown by the coloured bars.
Surface roughness map from (left) and how it is represented in the UM after regridding (right).
UM surface pressure at approximate Viking lander 1 and Viking lander 2 sites compared to observational data across a Martian year. Viking lander data available from .

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

January 2023

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116 Reads

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6 Citations

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 planetary climate model (PCM), finding good agreement in the seasonal wind and temperature profiles but with 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, highlights how the adaptation of an Earth general circulation model (GCM) can be beneficial for existing Mars GCMs and provides insight into the next steps in our development of a new Mars climate model.


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

August 2022

·

6 Reads

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.

Citations (1)


... Radiative transfer modeling was performed using the SOCRATES (Suite Of Community Radiative Transfer codes based on Edwards and Slingo) 1D multiple scattering radiative transfer code developed by the UK Met Office (Manners et al., 2022a(Manners et al., , 2022b. While SOCRATES has previously been developed to model Mars (McCulloch et al., 2023) and exoplanets (e.g., Boutle et al., 2020;Eager-Nash et al., 2020), this is the first time SOCRATES has been modified to model Venus. SOCRATES uses the two-stream approximation and correlated-k method to treat absorption (Edwards & Slingo, 1996;Goody et al., 1989). ...

Reference:

Is OSSO a Significant Contributor to the Unknown UV Absorber in Venus' Atmosphere?
A modern-day Mars climate in the Met Office Unified Model: dry simulations