The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution
ABSTRACT Global climate evolution models for habitable Earth-like planets do not consider the effect of ocean salinity on land ice formation through the hydrological cycle. We consider two categories of such planets: planets with deep oceans, but intrinsically high salinities due to the weaker salt...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
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croxfordunivpr:10.1093/mnras/staa3260 2024-06-09T07:38:01+00:00 The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution Pinotti, R Porto de Mello, G F Conselho Nacional de Desenvolvimento Científico e Tecnológico 2020 http://dx.doi.org/10.1093/mnras/staa3260 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa3260/33996232/staa3260.pdf http://academic.oup.com/mnras/article-pdf/500/2/2401/34542131/staa3260.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Monthly Notices of the Royal Astronomical Society volume 500, issue 2, page 2401-2416 ISSN 0035-8711 1365-2966 journal-article 2020 croxfordunivpr https://doi.org/10.1093/mnras/staa3260 2024-05-10T13:15:57Z ABSTRACT Global climate evolution models for habitable Earth-like planets do not consider the effect of ocean salinity on land ice formation through the hydrological cycle. We consider two categories of such planets: planets with deep oceans, but intrinsically high salinities due to the weaker salt removal process by hydrothermal vents; and planets with shallow oceans, where the increase in salt content and decrease in ocean area during the onset of glaciation cause a negative feedback, helping delay the spread of land ice. We developed a toy climate model of a habitable planet on the verge of an ice age, using a range of initial salt concentrations. Planets with deep oceans and high salinity show considerable increase in the time necessary to fill arctic land with ice sheets, up to 23 per cent considering the maximum salinity range. For planets with shallow oceans, the effect of intrinsic high salinity is reinforced by the negative feedback, counteracting positive feedbacks like the ice–albedo and Croll–Milankovitch perturbations, to the point of effectively terminating land ice sheet growth rate during the simulated time-scale. We also apply this model to the putative ocean of early Mars, finding intermediate results: salinity probably did not play a role in the evolution of Mars´ climate, considering the time-scale of its ice ages. We conclude that this phenomenon is essentially an abiotic self-regulation mechanism against ice ages and should be regarded in the context of habitable planets smaller and drier than the Earth, which may well represent the bulk of habitable planets. Article in Journal/Newspaper albedo Arctic Ice Sheet Oxford University Press Arctic Monthly Notices of the Royal Astronomical Society 500 2 2401 2416 |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
ABSTRACT Global climate evolution models for habitable Earth-like planets do not consider the effect of ocean salinity on land ice formation through the hydrological cycle. We consider two categories of such planets: planets with deep oceans, but intrinsically high salinities due to the weaker salt removal process by hydrothermal vents; and planets with shallow oceans, where the increase in salt content and decrease in ocean area during the onset of glaciation cause a negative feedback, helping delay the spread of land ice. We developed a toy climate model of a habitable planet on the verge of an ice age, using a range of initial salt concentrations. Planets with deep oceans and high salinity show considerable increase in the time necessary to fill arctic land with ice sheets, up to 23 per cent considering the maximum salinity range. For planets with shallow oceans, the effect of intrinsic high salinity is reinforced by the negative feedback, counteracting positive feedbacks like the ice–albedo and Croll–Milankovitch perturbations, to the point of effectively terminating land ice sheet growth rate during the simulated time-scale. We also apply this model to the putative ocean of early Mars, finding intermediate results: salinity probably did not play a role in the evolution of Mars´ climate, considering the time-scale of its ice ages. We conclude that this phenomenon is essentially an abiotic self-regulation mechanism against ice ages and should be regarded in the context of habitable planets smaller and drier than the Earth, which may well represent the bulk of habitable planets. |
author2 |
Conselho Nacional de Desenvolvimento Científico e Tecnológico |
format |
Article in Journal/Newspaper |
author |
Pinotti, R Porto de Mello, G F |
spellingShingle |
Pinotti, R Porto de Mello, G F The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution |
author_facet |
Pinotti, R Porto de Mello, G F |
author_sort |
Pinotti, R |
title |
The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution |
title_short |
The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution |
title_full |
The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution |
title_fullStr |
The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution |
title_full_unstemmed |
The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution |
title_sort |
most common habitable planets – ii. salty oceans in low-mass habitable planets and global climate evolution |
publisher |
Oxford University Press (OUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1093/mnras/staa3260 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa3260/33996232/staa3260.pdf http://academic.oup.com/mnras/article-pdf/500/2/2401/34542131/staa3260.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Ice Sheet |
genre_facet |
albedo Arctic Ice Sheet |
op_source |
Monthly Notices of the Royal Astronomical Society volume 500, issue 2, page 2401-2416 ISSN 0035-8711 1365-2966 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/mnras/staa3260 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
500 |
container_issue |
2 |
container_start_page |
2401 |
op_container_end_page |
2416 |
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1801383852460998656 |