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 ( δ 18 O ) 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...
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2020
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ftdoajarticles:oai:doaj.org/article:f8b116bd7ba94037a621b9c6b3a2d9e9 2023-05-15T16:26:06+02:00 Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: last interglacial HadCM3 simulations I. Malmierca-Vallet L. C. Sime P. J. Valdes J. C. Tindall 2020-12-01T00:00:00Z https://doi.org/10.5194/cp-16-2485-2020 https://doaj.org/article/f8b116bd7ba94037a621b9c6b3a2d9e9 EN eng Copernicus Publications https://cp.copernicus.org/articles/16/2485/2020/cp-16-2485-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-2485-2020 1814-9324 1814-9332 https://doaj.org/article/f8b116bd7ba94037a621b9c6b3a2d9e9 Climate of the Past, Vol 16, Pp 2485-2508 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-2485-2020 2022-12-31T06:06:37Z Changes in the Greenland ice sheet (GIS) affect global sea level. Greenland stable water isotope ( δ 18 O ) 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 δ 18 O 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 δ 18 O changes is found in coastal regions like the Camp Century site. Article in Journal/Newspaper Greenland ice core Ice Sheet Sea ice Directory of Open Access Journals: DOAJ Articles Greenland Climate of the Past 16 6 2485 2508 |
institution |
Open Polar |
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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 I. Malmierca-Vallet L. C. Sime P. J. Valdes J. C. Tindall Sea ice feedbacks influence the isotopic signature of Greenland ice sheet elevation changes: last interglacial HadCM3 simulations |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Changes in the Greenland ice sheet (GIS) affect global sea level. Greenland stable water isotope ( δ 18 O ) 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 δ 18 O 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 δ 18 O changes is found in coastal regions like the Camp Century site. |
format |
Article in Journal/Newspaper |
author |
I. Malmierca-Vallet L. C. Sime P. J. Valdes J. C. Tindall |
author_facet |
I. Malmierca-Vallet L. C. Sime P. J. Valdes J. C. Tindall |
author_sort |
I. Malmierca-Vallet |
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 Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-2485-2020 https://doaj.org/article/f8b116bd7ba94037a621b9c6b3a2d9e9 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Sea ice |
genre_facet |
Greenland ice core Ice Sheet Sea ice |
op_source |
Climate of the Past, Vol 16, Pp 2485-2508 (2020) |
op_relation |
https://cp.copernicus.org/articles/16/2485/2020/cp-16-2485-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-2485-2020 1814-9324 1814-9332 https://doaj.org/article/f8b116bd7ba94037a621b9c6b3a2d9e9 |
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 |
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1766014963547111424 |