Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet
Previous modelling efforts have investigated climate responses to different Milankovitch forcing during Marine Isotope Stage (MIS) 13. During this time the climate has been highly variable at atmospheric CO2 concentrations of ~240 ppm. As yet, ice sheet-climate feedbacks were missing in previous stu...
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ftoceanrep:oai:oceanrep.geomar.de:54515 2024-02-11T10:01:31+01:00 Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet Niu, Lu Lohmann, Gerrit Gierz, Paul Gowan, Evan J. Knorr, Gregor 2021-05 text https://oceanrep.geomar.de/id/eprint/54515/ https://oceanrep.geomar.de/id/eprint/54515/1/1-s2.0-S092181812100059X-main.pdf https://doi.org/10.1016/j.gloplacha.2021.103474 en eng Elsevier https://oceanrep.geomar.de/id/eprint/54515/1/1-s2.0-S092181812100059X-main.pdf Niu, L., Lohmann, G., Gierz, P., Gowan, E. J. and Knorr, G. (2021) Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet. Open Access Global and Planetary Change, 200 . Art.Nr. 103474. DOI 10.1016/j.gloplacha.2021.103474 <https://doi.org/10.1016/j.gloplacha.2021.103474>. doi:10.1016/j.gloplacha.2021.103474 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1016/j.gloplacha.2021.103474 2024-01-15T00:24:34Z Previous modelling efforts have investigated climate responses to different Milankovitch forcing during Marine Isotope Stage (MIS) 13. During this time the climate has been highly variable at atmospheric CO2 concentrations of ~240 ppm. As yet, ice sheet-climate feedbacks were missing in previous studies. Therefore we use the state-of-the-art coupled climate-ice sheet model, AWI-ESM-1.2, to investigate the MIS-13 climate and corresponding Northern Hemisphere ice sheet (NHIS) evolution by performing simulations under three different astronomical configurations representing 495, 506 and 517 kyr BP. The simulated excess ice compared to present-day is mainly over the Cordillera, Arctic islands and Tibet. The global mean surface air temperature for the MIS-13 experiments have the same magnitude. At 506 kyr BP with boreal summer at perihelion, the Northern Hemisphere continents are warmer during summer than the other experiments, which could potentially inhibit the development of the ice sheets. The Cordilleran Ice Sheet is found to be especially sensitive to orbital (precession) forcing, at an intermediate CO2 level. This is probably due to its high elevation where the freezing point could be easily maintained. The other ice sheets over northeast America and Eurasia, however, are absent in our simulations. We propose that the alpine-based Cordilleran Ice Sheet is more sensitive and easier to build up than other NHISs in response to the astronomical controlled summer insolation. Dynamic surges are simulated for the Cordilleran Ice Sheet under fixed low orbital forcing. These surges due to internal ice sheet-climate feedbacks could potentially be the mechanism for the millennial scale H-like events. Article in Journal/Newspaper Arctic Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Global and Planetary Change 200 103474 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Previous modelling efforts have investigated climate responses to different Milankovitch forcing during Marine Isotope Stage (MIS) 13. During this time the climate has been highly variable at atmospheric CO2 concentrations of ~240 ppm. As yet, ice sheet-climate feedbacks were missing in previous studies. Therefore we use the state-of-the-art coupled climate-ice sheet model, AWI-ESM-1.2, to investigate the MIS-13 climate and corresponding Northern Hemisphere ice sheet (NHIS) evolution by performing simulations under three different astronomical configurations representing 495, 506 and 517 kyr BP. The simulated excess ice compared to present-day is mainly over the Cordillera, Arctic islands and Tibet. The global mean surface air temperature for the MIS-13 experiments have the same magnitude. At 506 kyr BP with boreal summer at perihelion, the Northern Hemisphere continents are warmer during summer than the other experiments, which could potentially inhibit the development of the ice sheets. The Cordilleran Ice Sheet is found to be especially sensitive to orbital (precession) forcing, at an intermediate CO2 level. This is probably due to its high elevation where the freezing point could be easily maintained. The other ice sheets over northeast America and Eurasia, however, are absent in our simulations. We propose that the alpine-based Cordilleran Ice Sheet is more sensitive and easier to build up than other NHISs in response to the astronomical controlled summer insolation. Dynamic surges are simulated for the Cordilleran Ice Sheet under fixed low orbital forcing. These surges due to internal ice sheet-climate feedbacks could potentially be the mechanism for the millennial scale H-like events. |
format |
Article in Journal/Newspaper |
author |
Niu, Lu Lohmann, Gerrit Gierz, Paul Gowan, Evan J. Knorr, Gregor |
spellingShingle |
Niu, Lu Lohmann, Gerrit Gierz, Paul Gowan, Evan J. Knorr, Gregor Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet |
author_facet |
Niu, Lu Lohmann, Gerrit Gierz, Paul Gowan, Evan J. Knorr, Gregor |
author_sort |
Niu, Lu |
title |
Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet |
title_short |
Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet |
title_full |
Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet |
title_fullStr |
Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet |
title_full_unstemmed |
Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet |
title_sort |
coupled climate-ice sheet modelling of mis-13 reveals a sensitive cordilleran ice sheet |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/54515/ https://oceanrep.geomar.de/id/eprint/54515/1/1-s2.0-S092181812100059X-main.pdf https://doi.org/10.1016/j.gloplacha.2021.103474 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice Sheet |
genre_facet |
Arctic Ice Sheet |
op_relation |
https://oceanrep.geomar.de/id/eprint/54515/1/1-s2.0-S092181812100059X-main.pdf Niu, L., Lohmann, G., Gierz, P., Gowan, E. J. and Knorr, G. (2021) Coupled climate-ice sheet modelling of MIS-13 reveals a sensitive Cordilleran Ice Sheet. Open Access Global and Planetary Change, 200 . Art.Nr. 103474. DOI 10.1016/j.gloplacha.2021.103474 <https://doi.org/10.1016/j.gloplacha.2021.103474>. doi:10.1016/j.gloplacha.2021.103474 |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2021.103474 |
container_title |
Global and Planetary Change |
container_volume |
200 |
container_start_page |
103474 |
_version_ |
1790597321620193280 |