Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates
International audience 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, atmosp...
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ftccsdartic:oai:HAL:hal-00298120v1 2024-02-11T10:08:32+01:00 Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates Romanova, V. Lohmann, G. Grosfeld, K. Department of Physics Bremen University of Bremen Department of Bentho-pelagic processes Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association 2005-12-07 https://hal.science/hal-00298120 https://hal.science/hal-00298120/document https://hal.science/hal-00298120/file/cpd-1-255-2005.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298120 https://hal.science/hal-00298120 https://hal.science/hal-00298120/document https://hal.science/hal-00298120/file/cpd-1-255-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298120 Climate of the Past Discussions, 2005, 1 (3), pp.255-285 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftccsdartic 2024-01-21T01:00:03Z International audience 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 CO 2 , orography and oceanic heat transport may cause an ice-covered Earth. Changing only one boundary or initial condition, the model produces solutions with at least some ice-free 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 CO 2 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. Article in Journal/Newspaper Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Romanova, V. Lohmann, G. Grosfeld, K. Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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 CO 2 , orography and oceanic heat transport may cause an ice-covered Earth. Changing only one boundary or initial condition, the model produces solutions with at least some ice-free 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 CO 2 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. |
author2 |
Department of Physics Bremen University of Bremen Department of Bentho-pelagic processes Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association |
format |
Article in Journal/Newspaper |
author |
Romanova, V. Lohmann, G. Grosfeld, K. |
author_facet |
Romanova, V. Lohmann, G. Grosfeld, K. |
author_sort |
Romanova, V. |
title |
Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates |
title_short |
Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates |
title_full |
Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates |
title_fullStr |
Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates |
title_full_unstemmed |
Effect of land albedo, CO 2 , orography, and oceanic heat transport on extreme climates |
title_sort |
effect of land albedo, co 2 , orography, and oceanic heat transport on extreme climates |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00298120 https://hal.science/hal-00298120/document https://hal.science/hal-00298120/file/cpd-1-255-2005.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298120 Climate of the Past Discussions, 2005, 1 (3), pp.255-285 |
op_relation |
hal-00298120 https://hal.science/hal-00298120 https://hal.science/hal-00298120/document https://hal.science/hal-00298120/file/cpd-1-255-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790607919455141888 |