- Title
- Longitudinal filtering, sponge layers, and equatorial jet formation in a general circulation model of gaseous exoplanets
- Creator
- Christie, D.A.; Mayne, N.J.; Zamyatina, M.; Baskett, H.; Evans-Soma, T.M.; Wood, N.; Kohary, K.
- Relation
- Monthly Notices of the Royal Astronomical Society Vol. 532, Issue 3, p. 3001-3019
- Publisher Link
- http://dx.doi.org/10.1093/mnras/stae1408
- Publisher
- Oxford University Press
- Resource Type
- journal article
- Date
- 2024
- Description
- General circulation models are a useful tool in understanding the three dimensional structure of hot Jupiter and sub-Neptune atmospheres; however, understanding the validity of the results from these simulations requires an understanding of the artificial dissipation required for numerical stability. In this paper, we investigate the impact of the longitudinal filter and vertical ‘sponge’ used in the Met Office’s unified model when simulating gaseous exoplanets. We demonstrate that excessive dissipation can result in counter-rotating jets and a catastrophic failure to conserve angular momentum. Once the dissipation is reduced to a level where a super-rotating jet forms, however, the jet and thermal structure are relatively insensitive to the dissipation, except in the nightside gyres where temperatures can vary by . We do find, however, that flattening the latitudinal profile of the longitudinal filtering alters the results more than a reduction in the strength of the filtering itself. We also show that even in situations where the temperatures are relatively insensitive to the dissipation, the vertical velocities can still vary with the dissipation, potentially impacting physical processes that depend on the local vertical transport.
- Subject
- methods: numerical; planets and satellites: atmospheres; planets and satellites: gaseous planets
- Identifier
- http://hdl.handle.net/1959.13/1515646
- Identifier
- uon:56908
- Identifier
- ISSN:0035-8711
- Rights
- © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
- Language
- eng
- Full Text
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