Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations
Changes in the Greenland ice sheet (GIS) affect global sea level. Greenland stable water isotope (δ18O) records from ice cores offer information on past changes in the surface of the GIS. Here, we use the isotope-enabled Hadley Centre Coupled Model version 3 (HadCM3) climate model to simulate a set...
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Copernicus
2020
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ftnerc:oai:nora.nerc.ac.uk:527524 2023-05-15T16:25:53+02:00 Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations Malmierca-Vallet, Irene Sime, Louise C. Valdes, Paul J. Tindall, Julia C. 2020-12-21 text http://nora.nerc.ac.uk/id/eprint/527524/ https://nora.nerc.ac.uk/id/eprint/527524/1/cp-16-2485-2020.pdf https://cp.copernicus.org/articles/16/2485/2020/cp-16-2485-2020.html en eng Copernicus https://nora.nerc.ac.uk/id/eprint/527524/1/cp-16-2485-2020.pdf Malmierca-Vallet, Irene orcid:0000-0002-2871-9741 Sime, Louise C. orcid:0000-0002-9093-7926 Valdes, Paul J.; Tindall, Julia C. 2020 Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations. Climate of the Past, 16 (6). 2485-2508. https://doi.org/10.5194/cp-16-2485-2020 <https://doi.org/10.5194/cp-16-2485-2020> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.5194/cp-16-2485-2020 2023-02-04T19:50:35Z Changes in the Greenland ice sheet (GIS) affect global sea level. Greenland stable water isotope (δ18O) records from ice cores offer information on past changes in the surface of the GIS. Here, we use the isotope-enabled Hadley Centre Coupled Model version 3 (HadCM3) climate model to simulate a set of last interglacial (LIG) idealised GIS surface elevation change scenarios focusing on GIS ice core sites. We investigate how δ18O depends on the magnitude and sign of GIS elevation change and evaluate how the response is altered by sea ice changes. We find that modifying GIS elevation induces changes in Northern Hemisphere atmospheric circulation, sea ice and precipitation patterns. These climate feedbacks lead to ice-core-averaged isotopic lapse rates of 0.49 ‰ (100 m)−1 for the lowered GIS states and 0.29 ‰ (100 m)−1 for the enlarged GIS states. This is lower than the spatially derived Greenland lapse rates of 0.62–0.72 ‰ (100 m)−1. These results thus suggest non-linearities in the isotope–elevation relationship and have consequences for the interpretation of past elevation and climate changes across Greenland. In particular, our results suggest that winter sea ice changes may significantly influence isotope–elevation gradients: winter sea ice effect can decrease (increase) modelled core-averaged isotopic lapse rate values by about −19 % (and +28 %) for the lowered (enlarged) GIS states, respectively. The largest influence of sea ice on δ18O changes is found in coastal regions like the Camp Century site. Article in Journal/Newspaper Greenland ice core Ice Sheet Sea ice Natural Environment Research Council: NERC Open Research Archive Greenland Climate of the Past 16 6 2485 2508 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Changes in the Greenland ice sheet (GIS) affect global sea level. Greenland stable water isotope (δ18O) records from ice cores offer information on past changes in the surface of the GIS. Here, we use the isotope-enabled Hadley Centre Coupled Model version 3 (HadCM3) climate model to simulate a set of last interglacial (LIG) idealised GIS surface elevation change scenarios focusing on GIS ice core sites. We investigate how δ18O depends on the magnitude and sign of GIS elevation change and evaluate how the response is altered by sea ice changes. We find that modifying GIS elevation induces changes in Northern Hemisphere atmospheric circulation, sea ice and precipitation patterns. These climate feedbacks lead to ice-core-averaged isotopic lapse rates of 0.49 ‰ (100 m)−1 for the lowered GIS states and 0.29 ‰ (100 m)−1 for the enlarged GIS states. This is lower than the spatially derived Greenland lapse rates of 0.62–0.72 ‰ (100 m)−1. These results thus suggest non-linearities in the isotope–elevation relationship and have consequences for the interpretation of past elevation and climate changes across Greenland. In particular, our results suggest that winter sea ice changes may significantly influence isotope–elevation gradients: winter sea ice effect can decrease (increase) modelled core-averaged isotopic lapse rate values by about −19 % (and +28 %) for the lowered (enlarged) GIS states, respectively. The largest influence of sea ice on δ18O changes is found in coastal regions like the Camp Century site. |
format |
Article in Journal/Newspaper |
author |
Malmierca-Vallet, Irene Sime, Louise C. Valdes, Paul J. Tindall, Julia C. |
spellingShingle |
Malmierca-Vallet, Irene Sime, Louise C. Valdes, Paul J. Tindall, Julia C. Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations |
author_facet |
Malmierca-Vallet, Irene Sime, Louise C. Valdes, Paul J. Tindall, Julia C. |
author_sort |
Malmierca-Vallet, Irene |
title |
Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations |
title_short |
Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations |
title_full |
Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations |
title_fullStr |
Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations |
title_full_unstemmed |
Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations |
title_sort |
sea ice feedbacks influence the isotopic signature of greenland ice sheet elevation changes: last interglacial hadcm3 simulations |
publisher |
Copernicus |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/527524/ https://nora.nerc.ac.uk/id/eprint/527524/1/cp-16-2485-2020.pdf https://cp.copernicus.org/articles/16/2485/2020/cp-16-2485-2020.html |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Sea ice |
genre_facet |
Greenland ice core Ice Sheet Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/527524/1/cp-16-2485-2020.pdf Malmierca-Vallet, Irene orcid:0000-0002-2871-9741 Sime, Louise C. orcid:0000-0002-9093-7926 Valdes, Paul J.; Tindall, Julia C. 2020 Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: Last interglacial HadCM3 simulations. Climate of the Past, 16 (6). 2485-2508. https://doi.org/10.5194/cp-16-2485-2020 <https://doi.org/10.5194/cp-16-2485-2020> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-16-2485-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
6 |
container_start_page |
2485 |
op_container_end_page |
2508 |
_version_ |
1766014724858707968 |