The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability
Abstract The climate-modeling problems associated with global change underline the importance of understanding paleoclimates. The available evidence, which suggests that the Earth has never been fully glaciated, poses an especially serious problem for the early Earth when the Sun was about 20–30% fa...
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Online Access: | http://dx.doi.org/10.1017/s0022143000017780 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000017780 |
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crcambridgeupr:10.1017/s0022143000017780 2024-03-03T08:46:01+00:00 The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability Molnar, Gyula I. Gutowski, William J. 1995 http://dx.doi.org/10.1017/s0022143000017780 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000017780 en eng Cambridge University Press (CUP) Journal of Glaciology volume 41, issue 137, page 87-90 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0022143000017780 2024-02-08T08:36:10Z Abstract The climate-modeling problems associated with global change underline the importance of understanding paleoclimates. The available evidence, which suggests that the Earth has never been fully glaciated, poses an especially serious problem for the early Earth when the Sun was about 20–30% fainter than today. In conventional explanations of this “faint young Sun paradox”, presumed very high levels of atmospheric greenhouse gases are required to prevent runaway glaciation of the Earth. Here we explore other possible explanations of this paradox. As an extension of our previous work on this subject, we illustrate how-dynamical beat-flux feed backs may have prevented the early Earth from freezing. Our simulations are carried out using a two-dimensional, seasonal-climate model with physically based parameterizations for atmospheric meridional-heat transport and sea ice. It ís found that dynamical heat-flux feed backs alone may have protected the Archean Earth against a runaway glaciation to a considerable degree. Article in Journal/Newspaper Journal of Glaciology Sea ice Cambridge University Press Journal of Glaciology 41 137 87 90 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Molnar, Gyula I. Gutowski, William J. The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
topic_facet |
Earth-Surface Processes |
description |
Abstract The climate-modeling problems associated with global change underline the importance of understanding paleoclimates. The available evidence, which suggests that the Earth has never been fully glaciated, poses an especially serious problem for the early Earth when the Sun was about 20–30% fainter than today. In conventional explanations of this “faint young Sun paradox”, presumed very high levels of atmospheric greenhouse gases are required to prevent runaway glaciation of the Earth. Here we explore other possible explanations of this paradox. As an extension of our previous work on this subject, we illustrate how-dynamical beat-flux feed backs may have prevented the early Earth from freezing. Our simulations are carried out using a two-dimensional, seasonal-climate model with physically based parameterizations for atmospheric meridional-heat transport and sea ice. It ís found that dynamical heat-flux feed backs alone may have protected the Archean Earth against a runaway glaciation to a considerable degree. |
format |
Article in Journal/Newspaper |
author |
Molnar, Gyula I. Gutowski, William J. |
author_facet |
Molnar, Gyula I. Gutowski, William J. |
author_sort |
Molnar, Gyula I. |
title |
The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
title_short |
The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
title_full |
The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
title_fullStr |
The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
title_full_unstemmed |
The “faint young Sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
title_sort |
“faint young sun paradox”: further exploration of the role of dynamical heat-flux feed backs in maintaining global climate stability |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0022143000017780 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000017780 |
genre |
Journal of Glaciology Sea ice |
genre_facet |
Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology volume 41, issue 137, page 87-90 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000017780 |
container_title |
Journal of Glaciology |
container_volume |
41 |
container_issue |
137 |
container_start_page |
87 |
op_container_end_page |
90 |
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1792501807490007040 |