Asymmetries in the simulated ozone distribution on TRAPPIST-1e due to orography
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| Format: | Preprint |
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2024
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| _version_ | 1866915005202432000 |
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| author | Bhongade, Anand Marsh, Daniel R Sainsbury-Martinez, Felix Cooke, Gregory J |
| author_facet | Bhongade, Anand Marsh, Daniel R Sainsbury-Martinez, Felix Cooke, Gregory J |
| contents | TRAPPIST-1e is a tidally locked rocky exoplanet orbiting the habitable zone of an M dwarf star. Upcoming observations are expected to reveal new rocky exoplanets and their atmospheres around M dwarf stars. To interpret these future observations we need to model the atmospheres of such exoplanets. We configured CESM2-WACCM6, a chemistry climate model, for the orbit and stellar irradiance of TRAPPIST-1e assuming an initial Earth-like atmospheric composition. Our aim is to characterize the possible ozone (O$_3$) distribution and explore how this is influenced by the atmospheric circulation shaped by orography, using the Helmholtz wind decomposition and meridional mass streamfunction. The model included Earth-like orography and the substellar point was located over the Pacific Ocean. For such a scenario, our analysis reveals a North-South asymmetry in the simulated O$_3$ distribution. The O$_3$ concentration is highest at pressures $>$ 10 hPa (below $\sim$30 km) near the South Pole. This asymmetry arises from the higher landmass fraction in the Northern Hemisphere, which causes drag in near-surface flows and leads to an asymmetric meridional overturning circulation. Catalytic species were roughly symmetrically distributed and were not found to be primary driver for the O$_3$ asymmetry. The total ozone column (TOC) density was higher for TRAPPIST-1e compared to Earth, with 8000 Dobson Units (DU) near the South Pole and 2000 DU near the North Pole. The results emphasise the sensitivity of O$_3$ to model parameters, illustrating how incorporating Earth-like orography can affect atmospheric dynamics and O$_3$ distribution. This link between surface features and atmospheric dynamics underlines the importance of how changing model parameters used to study exoplanet atmospheres can influence the interpretation of observations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_02444 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Asymmetries in the simulated ozone distribution on TRAPPIST-1e due to orography Bhongade, Anand Marsh, Daniel R Sainsbury-Martinez, Felix Cooke, Gregory J Earth and Planetary Astrophysics TRAPPIST-1e is a tidally locked rocky exoplanet orbiting the habitable zone of an M dwarf star. Upcoming observations are expected to reveal new rocky exoplanets and their atmospheres around M dwarf stars. To interpret these future observations we need to model the atmospheres of such exoplanets. We configured CESM2-WACCM6, a chemistry climate model, for the orbit and stellar irradiance of TRAPPIST-1e assuming an initial Earth-like atmospheric composition. Our aim is to characterize the possible ozone (O$_3$) distribution and explore how this is influenced by the atmospheric circulation shaped by orography, using the Helmholtz wind decomposition and meridional mass streamfunction. The model included Earth-like orography and the substellar point was located over the Pacific Ocean. For such a scenario, our analysis reveals a North-South asymmetry in the simulated O$_3$ distribution. The O$_3$ concentration is highest at pressures $>$ 10 hPa (below $\sim$30 km) near the South Pole. This asymmetry arises from the higher landmass fraction in the Northern Hemisphere, which causes drag in near-surface flows and leads to an asymmetric meridional overturning circulation. Catalytic species were roughly symmetrically distributed and were not found to be primary driver for the O$_3$ asymmetry. The total ozone column (TOC) density was higher for TRAPPIST-1e compared to Earth, with 8000 Dobson Units (DU) near the South Pole and 2000 DU near the North Pole. The results emphasise the sensitivity of O$_3$ to model parameters, illustrating how incorporating Earth-like orography can affect atmospheric dynamics and O$_3$ distribution. This link between surface features and atmospheric dynamics underlines the importance of how changing model parameters used to study exoplanet atmospheres can influence the interpretation of observations. |
| title | Asymmetries in the simulated ozone distribution on TRAPPIST-1e due to orography |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2407.02444 |