Clouds and Seasonality on Terrestrial Planets with Varying Rotation Rates
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arXiv
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| Format: | Preprint |
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2024
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| author | Williams, Daniel A. Ji, Xuan Corlies, Paul Lora, Juan M. |
| author_facet | Williams, Daniel A. Ji, Xuan Corlies, Paul Lora, Juan M. |
| contents | Using an idealised climate model incorporating seasonal forcing, we investigate the impact of rotation rate on the abundance of clouds on an Earth-like aquaplanet, and the resulting impacts upon albedo and seasonality. We show that the cloud distribution varies significantly with season, depending strongly on the rotation rate, and is well explained by the large-scale circulation and atmospheric state. Planetary albedo displays non-monotonic behaviour with rotation rate, peaking at around 1/2$Ω_E$. Clouds reduce the surface temperature and total precipitation relative to simulations without clouds at all rotation rates, and reduce the dependence of total precipitation on rotation rate, causing non-monotonic behaviour and a local maximum around 1/8$Ω_E$ ; these effects are related to the impacts of clouds on the net atmospheric and surface radiative energy budgets. Clouds also affect the seasonality. The influence of clouds on the extent of the winter Hadley cell and the intertropical convergence zone is relatively minor at slow rotation rates ($<$1/8$Ω_E$ ), but becomes more pronounced at intermediate rotation rates, where clouds decrease their maximum latitudes. The timing of seasonal transitions varies with rotation rate, and the addition of clouds reduces the seasonal phase lag. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_04900 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Clouds and Seasonality on Terrestrial Planets with Varying Rotation Rates Williams, Daniel A. Ji, Xuan Corlies, Paul Lora, Juan M. Atmospheric and Oceanic Physics Earth and Planetary Astrophysics Using an idealised climate model incorporating seasonal forcing, we investigate the impact of rotation rate on the abundance of clouds on an Earth-like aquaplanet, and the resulting impacts upon albedo and seasonality. We show that the cloud distribution varies significantly with season, depending strongly on the rotation rate, and is well explained by the large-scale circulation and atmospheric state. Planetary albedo displays non-monotonic behaviour with rotation rate, peaking at around 1/2$Ω_E$. Clouds reduce the surface temperature and total precipitation relative to simulations without clouds at all rotation rates, and reduce the dependence of total precipitation on rotation rate, causing non-monotonic behaviour and a local maximum around 1/8$Ω_E$ ; these effects are related to the impacts of clouds on the net atmospheric and surface radiative energy budgets. Clouds also affect the seasonality. The influence of clouds on the extent of the winter Hadley cell and the intertropical convergence zone is relatively minor at slow rotation rates ($<$1/8$Ω_E$ ), but becomes more pronounced at intermediate rotation rates, where clouds decrease their maximum latitudes. The timing of seasonal transitions varies with rotation rate, and the addition of clouds reduces the seasonal phase lag. |
| title | Clouds and Seasonality on Terrestrial Planets with Varying Rotation Rates |
| topic | Atmospheric and Oceanic Physics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2402.04900 |