under a Creative Commons License. Climate of the Past
Abstract. Using an atmospheric general circulation model of intermediate complexity coupled to a sea ice – slab ocean model, we perform a number of sensitivity experiments under present-day orbital conditions and geographical distribution to assess the possibility that land albedo, atmospheric CO2,...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.382.9322 2023-05-15T18:18:27+02:00 under a Creative Commons License. Climate of the Past V. Romanova G. Lohmann K. Grosfeld The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.9322 http://hal.archives-ouvertes.fr/docs/00/29/80/45/PDF/cp-2-31-2006.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.9322 http://hal.archives-ouvertes.fr/docs/00/29/80/45/PDF/cp-2-31-2006.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hal.archives-ouvertes.fr/docs/00/29/80/45/PDF/cp-2-31-2006.pdf text 2005 ftciteseerx 2016-09-18T00:26:59Z Abstract. Using an atmospheric general circulation model of intermediate complexity coupled to a sea ice – slab ocean model, we perform a number of sensitivity experiments under present-day orbital conditions and geographical distribution to assess the possibility that land albedo, atmospheric CO2, orography and oceanic heat transport may cause an icecovered Earth. Changing only one boundary or initial condition, the model produces solutions with at least some icefree oceans in the low latitudes. Using some combination of these forcing parameters, a full Earth’s glaciation is obtained. We find that the most significant factor leading to an ice-covered Earth is the high land albedo in combination with initial temperatures set equal to the freezing point. Oceanic heat transport and orography play only a minor role for the climate state. Extremely low concentrations of CO2 also appear to be insufficient to provoke a runaway ice-albedo feedback, but the strong deviations in surface air temperatures in the Northern Hemisphere point to the existence of a strong nonlinearity in the system. Finally, we argue that the initial condition determines whether the system can go into a completely ice covered state, indicating multiple equilibria, a feature known from simple energy balance models. 1 Text Sea ice Unknown |
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description |
Abstract. Using an atmospheric general circulation model of intermediate complexity coupled to a sea ice – slab ocean model, we perform a number of sensitivity experiments under present-day orbital conditions and geographical distribution to assess the possibility that land albedo, atmospheric CO2, orography and oceanic heat transport may cause an icecovered Earth. Changing only one boundary or initial condition, the model produces solutions with at least some icefree oceans in the low latitudes. Using some combination of these forcing parameters, a full Earth’s glaciation is obtained. We find that the most significant factor leading to an ice-covered Earth is the high land albedo in combination with initial temperatures set equal to the freezing point. Oceanic heat transport and orography play only a minor role for the climate state. Extremely low concentrations of CO2 also appear to be insufficient to provoke a runaway ice-albedo feedback, but the strong deviations in surface air temperatures in the Northern Hemisphere point to the existence of a strong nonlinearity in the system. Finally, we argue that the initial condition determines whether the system can go into a completely ice covered state, indicating multiple equilibria, a feature known from simple energy balance models. 1 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
V. Romanova G. Lohmann K. Grosfeld |
spellingShingle |
V. Romanova G. Lohmann K. Grosfeld under a Creative Commons License. Climate of the Past |
author_facet |
V. Romanova G. Lohmann K. Grosfeld |
author_sort |
V. Romanova |
title |
under a Creative Commons License. Climate of the Past |
title_short |
under a Creative Commons License. Climate of the Past |
title_full |
under a Creative Commons License. Climate of the Past |
title_fullStr |
under a Creative Commons License. Climate of the Past |
title_full_unstemmed |
under a Creative Commons License. Climate of the Past |
title_sort |
under a creative commons license. climate of the past |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.9322 http://hal.archives-ouvertes.fr/docs/00/29/80/45/PDF/cp-2-31-2006.pdf |
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Sea ice |
genre_facet |
Sea ice |
op_source |
http://hal.archives-ouvertes.fr/docs/00/29/80/45/PDF/cp-2-31-2006.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.9322 http://hal.archives-ouvertes.fr/docs/00/29/80/45/PDF/cp-2-31-2006.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766195020116787200 |