Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling
We present an ensemble of last glacial inception (LGI) simulations for the Northern Hemisphere that captures a significant fraction of inferred ice volume changes within proxy uncertainties. This ensemble was performed with LCice 1.0, a coupled ice sheet and climate model, varying parameters of both...
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ftdoajarticles:oai:doaj.org/article:119e724d6912496292f0c9e529194ee3 2023-05-15T16:00:14+02:00 Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling T. Bahadory L. Tarasov H. Andres 2021-02-01T00:00:00Z https://doi.org/10.5194/cp-17-397-2021 https://doaj.org/article/119e724d6912496292f0c9e529194ee3 EN eng Copernicus Publications https://cp.copernicus.org/articles/17/397/2021/cp-17-397-2021.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-17-397-2021 1814-9324 1814-9332 https://doaj.org/article/119e724d6912496292f0c9e529194ee3 Climate of the Past, Vol 17, Pp 397-418 (2021) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2021 ftdoajarticles https://doi.org/10.5194/cp-17-397-2021 2022-12-31T06:45:40Z We present an ensemble of last glacial inception (LGI) simulations for the Northern Hemisphere that captures a significant fraction of inferred ice volume changes within proxy uncertainties. This ensemble was performed with LCice 1.0, a coupled ice sheet and climate model, varying parameters of both climate and ice sheet components, as well as the coupling between them. Certain characteristics of the spatiotemporal pattern of ice growth and subsequent retreat in both North America (NA) and Eurasia (EA) are sensitive to parameter changes while others are not. We find that the initial inception of ice over NA and EA is best characterized by the nucleation of ice at high-latitude and high-elevation sites. Subsequent spreading and merger along with large-scale conversion of snowfields dominate in different sectors. The latter plays an important role in the merging of eastern and western ice regions in NA. The inception peak ice volume in the ensemble occurs approximately at 111 ka and therefore lags the summer 60 ∘ N insolation minimum by more than 3 kyr. Ice volumes consistently peak earlier over EA than NA. The inception peak in North America is characterized by a merged Laurentide and Cordilleran ice sheet, with the Davis Strait covered in ice in ∼80 % of simulations. Ice also bridges Greenland and Iceland in all runs by 114 ka and therefore blocks the Denmark Strait. This latter feature would thereby divert the East Greenland Current and Denmark Strait overflow with a potentially significant impact on ocean circulation. The Eurasian ice sheet at its inception peak varies across ensemble runs between a continuous ice sheet and multiple smaller ice caps. In both continents, the colder high latitudes (i.e. Ellesmere and Svalbard) tend to grow ice through the entire simulation (to 102 ka), while lower latitudes lose ice after ∼110 ka. We find temperature decreases over the initial phases of the inception lead to the expansion of NA ice sheet area and that subsequent precipitation increases contribute to its ... Article in Journal/Newspaper Davis Strait Denmark Strait East Greenland east greenland current Greenland Ice Sheet Iceland Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Greenland Climate of the Past 17 1 397 418 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 T. Bahadory L. Tarasov H. Andres Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
We present an ensemble of last glacial inception (LGI) simulations for the Northern Hemisphere that captures a significant fraction of inferred ice volume changes within proxy uncertainties. This ensemble was performed with LCice 1.0, a coupled ice sheet and climate model, varying parameters of both climate and ice sheet components, as well as the coupling between them. Certain characteristics of the spatiotemporal pattern of ice growth and subsequent retreat in both North America (NA) and Eurasia (EA) are sensitive to parameter changes while others are not. We find that the initial inception of ice over NA and EA is best characterized by the nucleation of ice at high-latitude and high-elevation sites. Subsequent spreading and merger along with large-scale conversion of snowfields dominate in different sectors. The latter plays an important role in the merging of eastern and western ice regions in NA. The inception peak ice volume in the ensemble occurs approximately at 111 ka and therefore lags the summer 60 ∘ N insolation minimum by more than 3 kyr. Ice volumes consistently peak earlier over EA than NA. The inception peak in North America is characterized by a merged Laurentide and Cordilleran ice sheet, with the Davis Strait covered in ice in ∼80 % of simulations. Ice also bridges Greenland and Iceland in all runs by 114 ka and therefore blocks the Denmark Strait. This latter feature would thereby divert the East Greenland Current and Denmark Strait overflow with a potentially significant impact on ocean circulation. The Eurasian ice sheet at its inception peak varies across ensemble runs between a continuous ice sheet and multiple smaller ice caps. In both continents, the colder high latitudes (i.e. Ellesmere and Svalbard) tend to grow ice through the entire simulation (to 102 ka), while lower latitudes lose ice after ∼110 ka. We find temperature decreases over the initial phases of the inception lead to the expansion of NA ice sheet area and that subsequent precipitation increases contribute to its ... |
format |
Article in Journal/Newspaper |
author |
T. Bahadory L. Tarasov H. Andres |
author_facet |
T. Bahadory L. Tarasov H. Andres |
author_sort |
T. Bahadory |
title |
Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling |
title_short |
Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling |
title_full |
Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling |
title_fullStr |
Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling |
title_full_unstemmed |
Last glacial inception trajectories for the Northern Hemisphere from coupled ice and climate modelling |
title_sort |
last glacial inception trajectories for the northern hemisphere from coupled ice and climate modelling |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-397-2021 https://doaj.org/article/119e724d6912496292f0c9e529194ee3 |
geographic |
Svalbard Greenland |
geographic_facet |
Svalbard Greenland |
genre |
Davis Strait Denmark Strait East Greenland east greenland current Greenland Ice Sheet Iceland Svalbard |
genre_facet |
Davis Strait Denmark Strait East Greenland east greenland current Greenland Ice Sheet Iceland Svalbard |
op_source |
Climate of the Past, Vol 17, Pp 397-418 (2021) |
op_relation |
https://cp.copernicus.org/articles/17/397/2021/cp-17-397-2021.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-17-397-2021 1814-9324 1814-9332 https://doaj.org/article/119e724d6912496292f0c9e529194ee3 |
op_doi |
https://doi.org/10.5194/cp-17-397-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
1 |
container_start_page |
397 |
op_container_end_page |
418 |
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1766396126358929408 |