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- Colose, Christopher M.NASA, Postdoctoral Program, Goddard Inst Space Studies, New York, NY 10025 USA (author)
Enhanced Habitability on High Obliquity Bodies near the Outer Edge of the Habitable Zone of Sun-like Stars
- Article/chapterEnglish2019
Publisher, publication year, extent ...
- 2019-10-18
- American Astronomical Society,2019
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-400751
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-400751URI
- https://doi.org/10.3847/1538-4357/ab4131DOI
Supplementary language notes
- Language:English
- Summary in:English
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- High obliquity planets represent potentially extreme limits of terrestrial climate, as they exhibit large seasonality, a reversed annual-mean pole-to-equator gradient of stellar heating, and novel cryospheres. A suite of 3D global climate model simulations is performed for low and high obliquity planets with various stellar fluxes, CO2 concentrations, and initial conditions to explore the propensity for high obliquity climates to undergo global glaciation. We also simulate planets with thick CO2 or H-2 atmospheres, such as those expected to develop near or beyond the outer edge of the habitable zone. We show that high obliquity planets are hotter than their low obliquity counterparts due to ice-albedo feedbacks for cold climates, and water vapor in warm climates. We suggest that the water vapor greenhouse trapping is greater on high obliquity bodies for a given global-mean temperature due to the different dynamical regimes that occur between the two states. While equatorial ice belts are stable at high obliquity in some climate regimes, it is substantially harder to achieve global glaciation than for a low obliquity planet. Temperate polar conditions can be present at high obliquity at forcings for which low obliquity planets would be in a hard snowball state. Furthermore, open ocean can persist even in the winter hemisphere and when global-mean temperatures are well below freezing. However, the influence of obliquity diminishes for dense atmospheres, in agreement with calculations from 1D energy balance models.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- planets and satellites: atmospheres
- planets and satellites: oceans
Added entries (persons, corporate bodies, meetings, titles ...)
- Del Genio, Anthony D.NASA, Goddard Inst Space Studies, 2880 Broadway, New York, NY 10025 USA (author)
- Way, Michael J.Uppsala universitet,Teoretisk astrofysik,NASA, Goddard Inst Space Studies, 2880 Broadway, New York, NY 10025 USA(Swepub:uu)micwa958 (author)
- NASA, Postdoctoral Program, Goddard Inst Space Studies, New York, NY 10025 USANASA, Goddard Inst Space Studies, 2880 Broadway, New York, NY 10025 USA (creator_code:org_t)
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- In:Astrophysical Journal: American Astronomical Society884:20004-637X1538-4357
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