Early-Holocene simulations using different forcings and resolutions in AWI-ESM
The earliest part of the Holocene, from 11.5k to 7k (k = 1000 years before present), is a critical transition period between the relatively cold last deglaciation and the warm middle Holocene. It is marked by more pronounced seasonality and reduced greenhouse gases (GHGs) than the present state, as...
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crsagepubl:10.1177/0959683620908634 2024-09-15T17:58:01+00:00 Early-Holocene simulations using different forcings and resolutions in AWI-ESM Shi, Xiaoxu Lohmann, Gerrit Sidorenko, Dmitry Yang, Hu 2020 http://dx.doi.org/10.1177/0959683620908634 http://journals.sagepub.com/doi/pdf/10.1177/0959683620908634 http://journals.sagepub.com/doi/full-xml/10.1177/0959683620908634 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 30, issue 7, page 996-1015 ISSN 0959-6836 1477-0911 journal-article 2020 crsagepubl https://doi.org/10.1177/0959683620908634 2024-09-03T04:20:28Z The earliest part of the Holocene, from 11.5k to 7k (k = 1000 years before present), is a critical transition period between the relatively cold last deglaciation and the warm middle Holocene. It is marked by more pronounced seasonality and reduced greenhouse gases (GHGs) than the present state, as well as by the presence of the Laurentide Ice Sheet (LIS) and glacial meltwater perturbation. This paper performs experiments under pre-industrial and different early-Holocene regimes with AWI-ESM (Alfred Wegener Institute–Earth System Model), a state-of-the-art climate model with unstructured mesh and varying resolutions, to examine the sensitivity of the simulated Atlantic meridional overturning circulation (AMOC) to early-Holocene insolation, GHGs, topography (including properties of the ice sheet), and glacial meltwater perturbation. In the experiments with early-Holocene Earth orbital parameters and GHGs applied, the AWI-ESM simulation shows a JJA (June–July–August) warming and DJF (December–January–February) cooling over the mid and high latitudes compared with pre-industrial conditions, with amplification over the continents. The presence of the LIS leads to an additional regional cooling over the North America. We also simulate the meltwater event around 8.2k. Big discrepancies are found in the oceanic responses to different locations and magnitudes of freshwater discharge. Our experiments, which compare the effects of freshwater release evenly across the Labrador Sea to a more precise injection along the western boundary of the North Atlantic (the coastal region of LIS), show significant differences in the ocean circulation response, as the former produces a major decline of the AMOC and the latter yields no obvious effect on the strength of the thermohaline circulation. Furthermore, proglacial drainage of Lakes Agassiz and Ojibway leads to a fast spin-down of the AMOC, followed, however, by a gradual recovery. Most hosing experiments lead to a warming over the Nordic Sea and Barents Sea of varying ... Article in Journal/Newspaper Barents Sea Ice Sheet Labrador Sea Nordic Sea North Atlantic SAGE Publications The Holocene 30 7 996 1015 |
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English |
description |
The earliest part of the Holocene, from 11.5k to 7k (k = 1000 years before present), is a critical transition period between the relatively cold last deglaciation and the warm middle Holocene. It is marked by more pronounced seasonality and reduced greenhouse gases (GHGs) than the present state, as well as by the presence of the Laurentide Ice Sheet (LIS) and glacial meltwater perturbation. This paper performs experiments under pre-industrial and different early-Holocene regimes with AWI-ESM (Alfred Wegener Institute–Earth System Model), a state-of-the-art climate model with unstructured mesh and varying resolutions, to examine the sensitivity of the simulated Atlantic meridional overturning circulation (AMOC) to early-Holocene insolation, GHGs, topography (including properties of the ice sheet), and glacial meltwater perturbation. In the experiments with early-Holocene Earth orbital parameters and GHGs applied, the AWI-ESM simulation shows a JJA (June–July–August) warming and DJF (December–January–February) cooling over the mid and high latitudes compared with pre-industrial conditions, with amplification over the continents. The presence of the LIS leads to an additional regional cooling over the North America. We also simulate the meltwater event around 8.2k. Big discrepancies are found in the oceanic responses to different locations and magnitudes of freshwater discharge. Our experiments, which compare the effects of freshwater release evenly across the Labrador Sea to a more precise injection along the western boundary of the North Atlantic (the coastal region of LIS), show significant differences in the ocean circulation response, as the former produces a major decline of the AMOC and the latter yields no obvious effect on the strength of the thermohaline circulation. Furthermore, proglacial drainage of Lakes Agassiz and Ojibway leads to a fast spin-down of the AMOC, followed, however, by a gradual recovery. Most hosing experiments lead to a warming over the Nordic Sea and Barents Sea of varying ... |
format |
Article in Journal/Newspaper |
author |
Shi, Xiaoxu Lohmann, Gerrit Sidorenko, Dmitry Yang, Hu |
spellingShingle |
Shi, Xiaoxu Lohmann, Gerrit Sidorenko, Dmitry Yang, Hu Early-Holocene simulations using different forcings and resolutions in AWI-ESM |
author_facet |
Shi, Xiaoxu Lohmann, Gerrit Sidorenko, Dmitry Yang, Hu |
author_sort |
Shi, Xiaoxu |
title |
Early-Holocene simulations using different forcings and resolutions in AWI-ESM |
title_short |
Early-Holocene simulations using different forcings and resolutions in AWI-ESM |
title_full |
Early-Holocene simulations using different forcings and resolutions in AWI-ESM |
title_fullStr |
Early-Holocene simulations using different forcings and resolutions in AWI-ESM |
title_full_unstemmed |
Early-Holocene simulations using different forcings and resolutions in AWI-ESM |
title_sort |
early-holocene simulations using different forcings and resolutions in awi-esm |
publisher |
SAGE Publications |
publishDate |
2020 |
url |
http://dx.doi.org/10.1177/0959683620908634 http://journals.sagepub.com/doi/pdf/10.1177/0959683620908634 http://journals.sagepub.com/doi/full-xml/10.1177/0959683620908634 |
genre |
Barents Sea Ice Sheet Labrador Sea Nordic Sea North Atlantic |
genre_facet |
Barents Sea Ice Sheet Labrador Sea Nordic Sea North Atlantic |
op_source |
The Holocene volume 30, issue 7, page 996-1015 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683620908634 |
container_title |
The Holocene |
container_volume |
30 |
container_issue |
7 |
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996 |
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1015 |
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1810434228859437056 |