ATMOSPHERIC DYNAMIC RESPONSE BY OBLIQUITY FORCING
This thesis presents the evolution of the atmospheric variables that affect planetary climate by increasing the obliquity, using a general circulation model (PlaSim) coupled to a slab ocean with mixed layer flux correction. The obliquity is increased between 30º and 90º in 16 aquaplanets with liquid...
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| Tipo de documento: | tese |
| Estado: | Versão publicada |
| Data de publicação: | 2019 |
| País: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/236807 |
| Acesso em linha: | https://hdl.handle.net/10533/236807 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Ciencias Naturales Otras Ciencias Naturales |
| Resumo: | This thesis presents the evolution of the atmospheric variables that affect planetary climate by increasing the obliquity, using a general circulation model (PlaSim) coupled to a slab ocean with mixed layer flux correction. The obliquity is increased between 30º and 90º in 16 aquaplanets with liquid sea surface and perform the simulation allowing the sea ice cover formation to be a consequence of its atmospheric dynamics. Insolation is maintained constant in each experiment, but changing the obliquity affects the radiation budget and the large scale circulation. Earth-like atmospheric dynamic is observed for planets with obliquity under 54º. Above this value, the latitudinal temperature gradient is reversed giving place to a new regime of jet streams, affecting the shape of Hadley and Ferrel cells and changing the position of the InterTropical Convergence Zone. As humidity and high temperatures determine Earth’s habitability, the wet-bulb temperature is introduced as an atmospheric index of habitability for Earth-like aquaplanets with above freezing temperatures. The aquaplanets are habitable all year round at all latitudes for values under 54º; above this value, habitability decreases toward the poles due to high temperatures. |
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