A GCM Simulation of the Climate 6000 years ago
Two 10-yr integrations of the UGAMP GCM are presented. Each has a full seasonal cycle, T42 resolution, interactive land and sea ice, and prescribed sea surface temperatures. They differ in that one integration represents present day climate (PD) and the other has a perturbed orbit and reduced atmosp...
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1997
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Online Access: | https://hdl.handle.net/1983/feedb73b-7106-47dd-81dc-00e8b8b0d028 https://research-information.bris.ac.uk/en/publications/feedb73b-7106-47dd-81dc-00e8b8b0d028 https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 https://research-information.bris.ac.uk/ws/files/66252767/Hall_Valdes_1997.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/feedb73b-7106-47dd-81dc-00e8b8b0d028 2024-02-04T10:04:27+01:00 A GCM Simulation of the Climate 6000 years ago Hall, NMJ Valdes, Paul J 1997-01 application/pdf https://hdl.handle.net/1983/feedb73b-7106-47dd-81dc-00e8b8b0d028 https://research-information.bris.ac.uk/en/publications/feedb73b-7106-47dd-81dc-00e8b8b0d028 https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 https://research-information.bris.ac.uk/ws/files/66252767/Hall_Valdes_1997.pdf eng eng info:eu-repo/semantics/openAccess Hall , NMJ & Valdes , P J 1997 , ' A GCM Simulation of the Climate 6000 years ago ' , Journal of Climate , vol. 10 , no. 1 , pp. 3-17 . https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 article 1997 ftubristolcris https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 2024-01-11T23:33:13Z Two 10-yr integrations of the UGAMP GCM are presented. Each has a full seasonal cycle, T42 resolution, interactive land and sea ice, and prescribed sea surface temperatures. They differ in that one integration represents present day climate (PD) and the other has a perturbed orbit and reduced atmospheric concentrations of CO2 appropriate to the climate of 6000 years ago (6 kyr, hereafter 6k). The 6k integration produces enhanced continental warmth during summer and cold during winter. Changes in atmospheric temperature gradients brought about by the surface response lead to altered jet stream structures and transient eddy activity, which in turn affect precipitation patterns. Tropical “monsoon”-type circulation patterns are also affected, also leading to altered precipitation. Many of the changes in hydrology mimic the geological record remarkably well: the Sahel is much wetter, as are the midwestern United States and the Mediterranean regions; California and northern Europe are drier. Processes leading to the model’s surface responses in both temperature and hydrology are described in detail. Finally, the sensitivity of the results to an alternative, objective definition of the 6k calendar is investigated. This sensitivity is found to be smaller than the overall signal to the extent that the principal conclusions are not altered. Article in Journal/Newspaper Sea ice University of Bristol: Bristol Research |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Two 10-yr integrations of the UGAMP GCM are presented. Each has a full seasonal cycle, T42 resolution, interactive land and sea ice, and prescribed sea surface temperatures. They differ in that one integration represents present day climate (PD) and the other has a perturbed orbit and reduced atmospheric concentrations of CO2 appropriate to the climate of 6000 years ago (6 kyr, hereafter 6k). The 6k integration produces enhanced continental warmth during summer and cold during winter. Changes in atmospheric temperature gradients brought about by the surface response lead to altered jet stream structures and transient eddy activity, which in turn affect precipitation patterns. Tropical “monsoon”-type circulation patterns are also affected, also leading to altered precipitation. Many of the changes in hydrology mimic the geological record remarkably well: the Sahel is much wetter, as are the midwestern United States and the Mediterranean regions; California and northern Europe are drier. Processes leading to the model’s surface responses in both temperature and hydrology are described in detail. Finally, the sensitivity of the results to an alternative, objective definition of the 6k calendar is investigated. This sensitivity is found to be smaller than the overall signal to the extent that the principal conclusions are not altered. |
format |
Article in Journal/Newspaper |
author |
Hall, NMJ Valdes, Paul J |
spellingShingle |
Hall, NMJ Valdes, Paul J A GCM Simulation of the Climate 6000 years ago |
author_facet |
Hall, NMJ Valdes, Paul J |
author_sort |
Hall, NMJ |
title |
A GCM Simulation of the Climate 6000 years ago |
title_short |
A GCM Simulation of the Climate 6000 years ago |
title_full |
A GCM Simulation of the Climate 6000 years ago |
title_fullStr |
A GCM Simulation of the Climate 6000 years ago |
title_full_unstemmed |
A GCM Simulation of the Climate 6000 years ago |
title_sort |
gcm simulation of the climate 6000 years ago |
publishDate |
1997 |
url |
https://hdl.handle.net/1983/feedb73b-7106-47dd-81dc-00e8b8b0d028 https://research-information.bris.ac.uk/en/publications/feedb73b-7106-47dd-81dc-00e8b8b0d028 https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 https://research-information.bris.ac.uk/ws/files/66252767/Hall_Valdes_1997.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Hall , NMJ & Valdes , P J 1997 , ' A GCM Simulation of the Climate 6000 years ago ' , Journal of Climate , vol. 10 , no. 1 , pp. 3-17 . https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/1520-0442(1997)010<0003%3AAGSOTC>2.0.CO%3B2 |
_version_ |
1789972922126827520 |