History of the Greenland Ice Sheet: paleoclimatic insights
Paleoclimatic records show that the Greenland Ice Sheet consistently has lost mass in response to warming, and grown in response to cooling. Such changes have occurred even at times of slow or zero sea-level change, so changing sea level cannot have been the cause of at least some of the ice-sheet c...
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ftharvardudash:oai:dash.harvard.edu:1/41401431 2023-05-15T16:28:16+02:00 History of the Greenland Ice Sheet: paleoclimatic insights Alley, Richard B. Andrews, J. T. Brigham-Grette, J. Clarke, G. K. C. Cuffey, K. M. Fitzpatrick, J. J. Funder, S. Marshall, S. J. Miller, G. H. Mitrovica, Jerry Muhs, D. R. Otto-Bliesner, B. L. Polyak, L. White, J. W. C. 2010 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401431 https://doi.org/10.1016/j.quascirev.2010.02.007 en_US eng Elsevier Quaternary Science Reviews Alley, Richard B., J.T. Andrews, J. Brigham-Grette, G.K.C. Clarke, K.M. Cuffey, J.J. Fitzpatrick, S. Funder, et al. 2010. “History of the Greenland Ice Sheet: Paleoclimatic Insights.” Quaternary Science Reviews 29 (15–16): 1728–56. https://doi.org/10.1016/j.quascirev.2010.02.007. 0277-3791 1873-457X http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401431 doi:10.1016/j.quascirev.2010.02.007 Journal Article 2010 ftharvardudash https://doi.org/10.1016/j.quascirev.2010.02.007 2022-04-05T18:54:06Z Paleoclimatic records show that the Greenland Ice Sheet consistently has lost mass in response to warming, and grown in response to cooling. Such changes have occurred even at times of slow or zero sea-level change, so changing sea level cannot have been the cause of at least some of the ice-sheet changes. In contrast, there are no documented major ice-sheet changes that occurred independent of temperature changes. Moreover, snowfall has increased when the climate warmed, but the ice sheet lost mass nonetheless: increased accumulation in the ice sheet's center has not been sufficient to counteract increased melting and flow near the edges. Most documented forcings and ice-sheet responses spanned periods of several thousand years, but limited data also show rapid response to rapid forcings. In particular, regions near the ice margin have responded within decades. However, major changes of central regions of the ice sheet are thought to require centuries to millennia. The paleoclimatic record does not yet strongly constrain how rapidly a major shrinkage or nearly complete loss of the ice sheet could occur. The evidence suggests nearly total ice-sheet loss may result from warming of more than a few degrees above mean 20th century values, but this threshold is poorly defined (perhaps as little as 2 degrees C or more than 7 degrees C). Paleoclimatic records are sufficiently sketchy that the ice sheet may have grown temporarily in response to warming, or changes may have been induced by factors other than temperature, without having been recorded. Proof Article in Journal/Newspaper Greenland Ice Sheet Harvard University: DASH - Digital Access to Scholarship at Harvard Greenland Quaternary Science Reviews 29 15-16 1728 1756 |
institution |
Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
Paleoclimatic records show that the Greenland Ice Sheet consistently has lost mass in response to warming, and grown in response to cooling. Such changes have occurred even at times of slow or zero sea-level change, so changing sea level cannot have been the cause of at least some of the ice-sheet changes. In contrast, there are no documented major ice-sheet changes that occurred independent of temperature changes. Moreover, snowfall has increased when the climate warmed, but the ice sheet lost mass nonetheless: increased accumulation in the ice sheet's center has not been sufficient to counteract increased melting and flow near the edges. Most documented forcings and ice-sheet responses spanned periods of several thousand years, but limited data also show rapid response to rapid forcings. In particular, regions near the ice margin have responded within decades. However, major changes of central regions of the ice sheet are thought to require centuries to millennia. The paleoclimatic record does not yet strongly constrain how rapidly a major shrinkage or nearly complete loss of the ice sheet could occur. The evidence suggests nearly total ice-sheet loss may result from warming of more than a few degrees above mean 20th century values, but this threshold is poorly defined (perhaps as little as 2 degrees C or more than 7 degrees C). Paleoclimatic records are sufficiently sketchy that the ice sheet may have grown temporarily in response to warming, or changes may have been induced by factors other than temperature, without having been recorded. Proof |
format |
Article in Journal/Newspaper |
author |
Alley, Richard B. Andrews, J. T. Brigham-Grette, J. Clarke, G. K. C. Cuffey, K. M. Fitzpatrick, J. J. Funder, S. Marshall, S. J. Miller, G. H. Mitrovica, Jerry Muhs, D. R. Otto-Bliesner, B. L. Polyak, L. White, J. W. C. |
spellingShingle |
Alley, Richard B. Andrews, J. T. Brigham-Grette, J. Clarke, G. K. C. Cuffey, K. M. Fitzpatrick, J. J. Funder, S. Marshall, S. J. Miller, G. H. Mitrovica, Jerry Muhs, D. R. Otto-Bliesner, B. L. Polyak, L. White, J. W. C. History of the Greenland Ice Sheet: paleoclimatic insights |
author_facet |
Alley, Richard B. Andrews, J. T. Brigham-Grette, J. Clarke, G. K. C. Cuffey, K. M. Fitzpatrick, J. J. Funder, S. Marshall, S. J. Miller, G. H. Mitrovica, Jerry Muhs, D. R. Otto-Bliesner, B. L. Polyak, L. White, J. W. C. |
author_sort |
Alley, Richard B. |
title |
History of the Greenland Ice Sheet: paleoclimatic insights |
title_short |
History of the Greenland Ice Sheet: paleoclimatic insights |
title_full |
History of the Greenland Ice Sheet: paleoclimatic insights |
title_fullStr |
History of the Greenland Ice Sheet: paleoclimatic insights |
title_full_unstemmed |
History of the Greenland Ice Sheet: paleoclimatic insights |
title_sort |
history of the greenland ice sheet: paleoclimatic insights |
publisher |
Elsevier |
publishDate |
2010 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401431 https://doi.org/10.1016/j.quascirev.2010.02.007 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
Quaternary Science Reviews Alley, Richard B., J.T. Andrews, J. Brigham-Grette, G.K.C. Clarke, K.M. Cuffey, J.J. Fitzpatrick, S. Funder, et al. 2010. “History of the Greenland Ice Sheet: Paleoclimatic Insights.” Quaternary Science Reviews 29 (15–16): 1728–56. https://doi.org/10.1016/j.quascirev.2010.02.007. 0277-3791 1873-457X http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401431 doi:10.1016/j.quascirev.2010.02.007 |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.02.007 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
15-16 |
container_start_page |
1728 |
op_container_end_page |
1756 |
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1766017899115315200 |