Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation
R.F. Ivanovic acknowledges support from NERC grant NE/K008536/1. Numerical climate model simulations made use of the N8 High Performance Computing (HPC) Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1) and ARC2, part of the HPC facilities at the University of Leeds, UK. L.F. Robins...
Published in: | Paleoceanography and Paleoclimatology |
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Online Access: | http://hdl.handle.net/10023/15798 https://doi.org/10.1029/2017PA003308 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/15798 2023-07-02T03:32:28+02:00 Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation Ivanovic, Ruza Gregoire, Lauren Burke, Andrea Wickert, A. D. Valdes, P. J. Ng, H. C. Robinson, L. F. McManus, J. F. Mitrovica, J. X. Lee, L. Dentith, J. E. University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry 2018-07-27 18 application/pdf http://hdl.handle.net/10023/15798 https://doi.org/10.1029/2017PA003308 eng eng Paleoceanography and Paleoclimatology Ivanovic , R , Gregoire , L , Burke , A , Wickert , A D , Valdes , P J , Ng , H C , Robinson , L F , McManus , J F , Mitrovica , J X , Lee , L & Dentith , J E 2018 , ' Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation ' , Paleoceanography and Paleoclimatology , vol. Early View . https://doi.org/10.1029/2017PA003308 2572-4525 PURE: 253366218 PURE UUID: 8efb5fd5-4218-40c6-a809-8febbabb0bb1 Scopus: 85050792474 WOS: 000441277800011 ORCID: /0000-0002-3754-1498/work/64034546 http://hdl.handle.net/10023/15798 https://doi.org/10.1029/2017PA003308 © 2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Heinrich Stadial 1 Meltwater AMOC Freshwater forcing Deglaciation Stadial GE Environmental Sciences DAS SDG 13 - Climate Action GE Journal article 2018 ftstandrewserep https://doi.org/10.1029/2017PA003308 2023-06-13T18:28:09Z R.F. Ivanovic acknowledges support from NERC grant NE/K008536/1. Numerical climate model simulations made use of the N8 High Performance Computing (HPC) Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1) and ARC2, part of the HPC facilities at the University of Leeds, UK. L.F. Robinson and H.C. Ng acknowledge support from 639 ERC grant 278705 and NERC grant NE/N003861/1. The contribution of J.F. McManus was supported in part by the US NSF. J. Dentith was funded by NERC SPHERES Doctoral Training 641 Partnership (NERC grant NE/L002574/1). The cause of a rapid change in Atlantic Ocean circulation and northern cooling at the onset of Heinrich Stadial 1 ~18.5 ka is unclear. Previous studies have simulated the event using ice sheet and/or iceberg meltwater forcing, but these idealized freshwater fluxes have been unrealistically large. Here, we use a different approach, driving a high‐resolution drainage network model with a recent time‐resolved global paleo ice sheet reconstruction to generate a realistic meltwater forcing. We input this flux to the HadCM3 climate model without adjusting the timing or amplitude and find that an acceleration in northern ice sheet melting (up to ~7.5 m kyr‐1 global mean sea level rise equivalent) triggers a 20% reduction in the Atlantic Meridional Overturning Circulation. The simulated pattern of ocean circulation and climate change matches an array of palaeoclimate and ocean circulation reconstructions for the onset of Heinrich Stadial 1, both in terms of rates and magnitude of change. This is achieved with a meltwater flux that matches constraints on sea level changes and ice sheet evolution around 19‐18 ka. Since the rates of melting are similar to those projected for Greenland by 2200, constraining the melt rates and magnitude of climate change during Heinrich Stadial 1 would provide an important test of climate model sensitivity to future ice sheet melt. Publisher PDF Peer reviewed Article in Journal/Newspaper Greenland Ice Sheet University of St Andrews: Digital Research Repository Greenland Paleoceanography and Paleoclimatology 33 7 807 824 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Heinrich Stadial 1 Meltwater AMOC Freshwater forcing Deglaciation Stadial GE Environmental Sciences DAS SDG 13 - Climate Action GE |
spellingShingle |
Heinrich Stadial 1 Meltwater AMOC Freshwater forcing Deglaciation Stadial GE Environmental Sciences DAS SDG 13 - Climate Action GE Ivanovic, Ruza Gregoire, Lauren Burke, Andrea Wickert, A. D. Valdes, P. J. Ng, H. C. Robinson, L. F. McManus, J. F. Mitrovica, J. X. Lee, L. Dentith, J. E. Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation |
topic_facet |
Heinrich Stadial 1 Meltwater AMOC Freshwater forcing Deglaciation Stadial GE Environmental Sciences DAS SDG 13 - Climate Action GE |
description |
R.F. Ivanovic acknowledges support from NERC grant NE/K008536/1. Numerical climate model simulations made use of the N8 High Performance Computing (HPC) Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1) and ARC2, part of the HPC facilities at the University of Leeds, UK. L.F. Robinson and H.C. Ng acknowledge support from 639 ERC grant 278705 and NERC grant NE/N003861/1. The contribution of J.F. McManus was supported in part by the US NSF. J. Dentith was funded by NERC SPHERES Doctoral Training 641 Partnership (NERC grant NE/L002574/1). The cause of a rapid change in Atlantic Ocean circulation and northern cooling at the onset of Heinrich Stadial 1 ~18.5 ka is unclear. Previous studies have simulated the event using ice sheet and/or iceberg meltwater forcing, but these idealized freshwater fluxes have been unrealistically large. Here, we use a different approach, driving a high‐resolution drainage network model with a recent time‐resolved global paleo ice sheet reconstruction to generate a realistic meltwater forcing. We input this flux to the HadCM3 climate model without adjusting the timing or amplitude and find that an acceleration in northern ice sheet melting (up to ~7.5 m kyr‐1 global mean sea level rise equivalent) triggers a 20% reduction in the Atlantic Meridional Overturning Circulation. The simulated pattern of ocean circulation and climate change matches an array of palaeoclimate and ocean circulation reconstructions for the onset of Heinrich Stadial 1, both in terms of rates and magnitude of change. This is achieved with a meltwater flux that matches constraints on sea level changes and ice sheet evolution around 19‐18 ka. Since the rates of melting are similar to those projected for Greenland by 2200, constraining the melt rates and magnitude of climate change during Heinrich Stadial 1 would provide an important test of climate model sensitivity to future ice sheet melt. Publisher PDF Peer reviewed |
author2 |
University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry |
format |
Article in Journal/Newspaper |
author |
Ivanovic, Ruza Gregoire, Lauren Burke, Andrea Wickert, A. D. Valdes, P. J. Ng, H. C. Robinson, L. F. McManus, J. F. Mitrovica, J. X. Lee, L. Dentith, J. E. |
author_facet |
Ivanovic, Ruza Gregoire, Lauren Burke, Andrea Wickert, A. D. Valdes, P. J. Ng, H. C. Robinson, L. F. McManus, J. F. Mitrovica, J. X. Lee, L. Dentith, J. E. |
author_sort |
Ivanovic, Ruza |
title |
Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation |
title_short |
Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation |
title_full |
Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation |
title_fullStr |
Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation |
title_full_unstemmed |
Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation |
title_sort |
acceleration of northern ice sheet melt induces amoc slowdown and northern cooling in simulations of the early last deglaciation |
publishDate |
2018 |
url |
http://hdl.handle.net/10023/15798 https://doi.org/10.1029/2017PA003308 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
Paleoceanography and Paleoclimatology Ivanovic , R , Gregoire , L , Burke , A , Wickert , A D , Valdes , P J , Ng , H C , Robinson , L F , McManus , J F , Mitrovica , J X , Lee , L & Dentith , J E 2018 , ' Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation ' , Paleoceanography and Paleoclimatology , vol. Early View . https://doi.org/10.1029/2017PA003308 2572-4525 PURE: 253366218 PURE UUID: 8efb5fd5-4218-40c6-a809-8febbabb0bb1 Scopus: 85050792474 WOS: 000441277800011 ORCID: /0000-0002-3754-1498/work/64034546 http://hdl.handle.net/10023/15798 https://doi.org/10.1029/2017PA003308 |
op_rights |
© 2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1029/2017PA003308 |
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Paleoceanography and Paleoclimatology |
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33 |
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7 |
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807 |
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1770272037317640192 |