Missing sea-level rise in southeast Greenland during and since the Little Ice Age
The Greenland Ice Sheet has been losing mass at an accelerating rate over the past 2 decades. Understanding ice mass and glacier changes during the preceding several hundred years prior to geodetic measurements is more difficult because evidence of past ice extent in many places was later overridden...
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ftcopernicus:oai:publications.copernicus.org:egusphere107970 2023-08-27T04:05:43+02:00 Missing sea-level rise in southeast Greenland during and since the Little Ice Age Woodroffe, Sarah Alice Wake, Leanne Mary Kjeldsen, Kristian K. Barlow, Natasha Louise Mary Long, Antony James Kjaer, Kurt Henrik 2023-08-02 application/pdf https://doi.org/10.5194/egusphere-2022-1324 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1324/ eng eng doi:10.5194/egusphere-2022-1324 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1324/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2022-1324 2023-08-07T16:24:18Z The Greenland Ice Sheet has been losing mass at an accelerating rate over the past 2 decades. Understanding ice mass and glacier changes during the preceding several hundred years prior to geodetic measurements is more difficult because evidence of past ice extent in many places was later overridden. Salt marshes provide the only continuous records of relative sea level (RSL) from close to the Greenland Ice Sheet that span the period of time during and since the Little Ice Age (LIA) and can be used to reconstruct ice mass gain and loss over recent centuries. Salt marsh sediments collected at the mouth of Dronning Marie Dal, close to the Greenland Ice Sheet margin in southeastern Greenland, record RSL changes over the past ca. 300 years through changing sediment and diatom stratigraphy. These RSL changes record a combination of processes that are dominated by local and regional changes in Greenland Ice Sheet mass balance during this critical period that spans the maximum of the LIA and 20th-century warming. In the early part of the record (1725–1762 CE) the rate of RSL rise is higher than reconstructed from the closest isolation basin at Timmiarmiut, but between 1762 and 1880 CE the RSL rate is within the error range of the rate of RSL change recorded in the isolation basin. RSL begins to slowly fall around 1880 CE, with a total amount of RSL fall of 0.09±0.1 m in the last 140 years. Modelled RSL, which takes into account contributions from post-LIA Greenland Ice Sheet glacio-isostatic adjustment (GIA), ongoing deglacial GIA, the global non-ice sheet glacial melt fingerprint, contributions from thermosteric effects, the Antarctic mass loss sea level fingerprint and terrestrial water storage, overpredicts the amount of RSL fall since the end of the LIA by at least 0.5 m. The GIA signal caused by post-LIA Greenland Ice Sheet mass loss is by far the largest contributor to this modelled RSL, and error in its calculation has a large impact on RSL predictions at Dronning Marie Dal. We cannot reconcile the modelled RSL ... Text Antarc* Antarctic glacier Greenland Ice Sheet Copernicus Publications: E-Journals Antarctic The Antarctic Greenland Timmiarmiut ENVELOPE(-42.217,-42.217,62.533,62.533) Dronning Marie Dal ENVELOPE(-42.000,-42.000,63.467,63.467) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The Greenland Ice Sheet has been losing mass at an accelerating rate over the past 2 decades. Understanding ice mass and glacier changes during the preceding several hundred years prior to geodetic measurements is more difficult because evidence of past ice extent in many places was later overridden. Salt marshes provide the only continuous records of relative sea level (RSL) from close to the Greenland Ice Sheet that span the period of time during and since the Little Ice Age (LIA) and can be used to reconstruct ice mass gain and loss over recent centuries. Salt marsh sediments collected at the mouth of Dronning Marie Dal, close to the Greenland Ice Sheet margin in southeastern Greenland, record RSL changes over the past ca. 300 years through changing sediment and diatom stratigraphy. These RSL changes record a combination of processes that are dominated by local and regional changes in Greenland Ice Sheet mass balance during this critical period that spans the maximum of the LIA and 20th-century warming. In the early part of the record (1725–1762 CE) the rate of RSL rise is higher than reconstructed from the closest isolation basin at Timmiarmiut, but between 1762 and 1880 CE the RSL rate is within the error range of the rate of RSL change recorded in the isolation basin. RSL begins to slowly fall around 1880 CE, with a total amount of RSL fall of 0.09±0.1 m in the last 140 years. Modelled RSL, which takes into account contributions from post-LIA Greenland Ice Sheet glacio-isostatic adjustment (GIA), ongoing deglacial GIA, the global non-ice sheet glacial melt fingerprint, contributions from thermosteric effects, the Antarctic mass loss sea level fingerprint and terrestrial water storage, overpredicts the amount of RSL fall since the end of the LIA by at least 0.5 m. The GIA signal caused by post-LIA Greenland Ice Sheet mass loss is by far the largest contributor to this modelled RSL, and error in its calculation has a large impact on RSL predictions at Dronning Marie Dal. We cannot reconcile the modelled RSL ... |
format |
Text |
author |
Woodroffe, Sarah Alice Wake, Leanne Mary Kjeldsen, Kristian K. Barlow, Natasha Louise Mary Long, Antony James Kjaer, Kurt Henrik |
spellingShingle |
Woodroffe, Sarah Alice Wake, Leanne Mary Kjeldsen, Kristian K. Barlow, Natasha Louise Mary Long, Antony James Kjaer, Kurt Henrik Missing sea-level rise in southeast Greenland during and since the Little Ice Age |
author_facet |
Woodroffe, Sarah Alice Wake, Leanne Mary Kjeldsen, Kristian K. Barlow, Natasha Louise Mary Long, Antony James Kjaer, Kurt Henrik |
author_sort |
Woodroffe, Sarah Alice |
title |
Missing sea-level rise in southeast Greenland during and since the Little Ice Age |
title_short |
Missing sea-level rise in southeast Greenland during and since the Little Ice Age |
title_full |
Missing sea-level rise in southeast Greenland during and since the Little Ice Age |
title_fullStr |
Missing sea-level rise in southeast Greenland during and since the Little Ice Age |
title_full_unstemmed |
Missing sea-level rise in southeast Greenland during and since the Little Ice Age |
title_sort |
missing sea-level rise in southeast greenland during and since the little ice age |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-1324 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1324/ |
long_lat |
ENVELOPE(-42.217,-42.217,62.533,62.533) ENVELOPE(-42.000,-42.000,63.467,63.467) |
geographic |
Antarctic The Antarctic Greenland Timmiarmiut Dronning Marie Dal |
geographic_facet |
Antarctic The Antarctic Greenland Timmiarmiut Dronning Marie Dal |
genre |
Antarc* Antarctic glacier Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic glacier Greenland Ice Sheet |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-1324 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1324/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-1324 |
_version_ |
1775357460435959808 |