Topography's crucial role in Heinrich Events
Heinrich Events, the abrupt changes in the Laurentide Ice Sheet that cause the appearance of the well-observed Heinrich Layers, are thought to have a strong effect on the global climate. The focus of most studies that have looked at the climate’s response to these events has been the freshwater flux...
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:35261 2023-05-15T16:40:18+02:00 Topography's crucial role in Heinrich Events Roberts, William Valdes, Paul Payne, Antony 2014-11-25 https://nrl.northumbria.ac.uk/id/eprint/35261/ https://doi.org/10.1073/pnas.1414882111 unknown National Academy of Sciences Roberts, William, Valdes, Paul and Payne, Antony (2014) Topography's crucial role in Heinrich Events. Proceedings of the National Academy of Sciences of the United States of America, 111 (47). pp. 16688-16693. ISSN 0027-8424 F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2014 ftunivnorthumb https://doi.org/10.1073/pnas.1414882111 2022-09-25T06:07:47Z Heinrich Events, the abrupt changes in the Laurentide Ice Sheet that cause the appearance of the well-observed Heinrich Layers, are thought to have a strong effect on the global climate. The focus of most studies that have looked at the climate’s response to these events has been the freshwater flux that results from melting icebergs. However, there is the possibility that the varying height of the ice sheet could force a change in the climate. In this study, we present results from a newly developed coupled climate/ice sheet model to show what effect this topographic change has both on its own and in concert with the flux of freshwater from melting icebergs. We show that the topographic forcing can explain a number of the climate changes that are observed during Heinrich Events, such as the warming and wettening in Florida and the warm sea surface temperatures in the central North Atlantic, which freshwater forcing alone cannot. We also find regions, for example the tropical Atlantic, where the response is a mixture of the two: Here observations may help disentangle the relative importance of each mechanism. These results suggest that the simple paradigm of a Heinrich Event causing climate change via freshwater inputs into the North Atlantic needs to be revised. Article in Journal/Newspaper Ice Sheet North Atlantic Northumbria University, Newcastle: Northumbria Research Link (NRL) Proceedings of the National Academy of Sciences 111 47 16688 16693 |
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Northumbria University, Newcastle: Northumbria Research Link (NRL) |
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F800 Physical and Terrestrial Geographical and Environmental Sciences |
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F800 Physical and Terrestrial Geographical and Environmental Sciences Roberts, William Valdes, Paul Payne, Antony Topography's crucial role in Heinrich Events |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Heinrich Events, the abrupt changes in the Laurentide Ice Sheet that cause the appearance of the well-observed Heinrich Layers, are thought to have a strong effect on the global climate. The focus of most studies that have looked at the climate’s response to these events has been the freshwater flux that results from melting icebergs. However, there is the possibility that the varying height of the ice sheet could force a change in the climate. In this study, we present results from a newly developed coupled climate/ice sheet model to show what effect this topographic change has both on its own and in concert with the flux of freshwater from melting icebergs. We show that the topographic forcing can explain a number of the climate changes that are observed during Heinrich Events, such as the warming and wettening in Florida and the warm sea surface temperatures in the central North Atlantic, which freshwater forcing alone cannot. We also find regions, for example the tropical Atlantic, where the response is a mixture of the two: Here observations may help disentangle the relative importance of each mechanism. These results suggest that the simple paradigm of a Heinrich Event causing climate change via freshwater inputs into the North Atlantic needs to be revised. |
format |
Article in Journal/Newspaper |
author |
Roberts, William Valdes, Paul Payne, Antony |
author_facet |
Roberts, William Valdes, Paul Payne, Antony |
author_sort |
Roberts, William |
title |
Topography's crucial role in Heinrich Events |
title_short |
Topography's crucial role in Heinrich Events |
title_full |
Topography's crucial role in Heinrich Events |
title_fullStr |
Topography's crucial role in Heinrich Events |
title_full_unstemmed |
Topography's crucial role in Heinrich Events |
title_sort |
topography's crucial role in heinrich events |
publisher |
National Academy of Sciences |
publishDate |
2014 |
url |
https://nrl.northumbria.ac.uk/id/eprint/35261/ https://doi.org/10.1073/pnas.1414882111 |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
Roberts, William, Valdes, Paul and Payne, Antony (2014) Topography's crucial role in Heinrich Events. Proceedings of the National Academy of Sciences of the United States of America, 111 (47). pp. 16688-16693. ISSN 0027-8424 |
op_doi |
https://doi.org/10.1073/pnas.1414882111 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
111 |
container_issue |
47 |
container_start_page |
16688 |
op_container_end_page |
16693 |
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1766030680642289664 |