Melt in the Greenland EastGRIP ice core reveals Holocene warm events
We present a record of melt events obtained from the East Greenland Ice Core Project (EastGRIP) ice core in central northeastern Greenland, covering the largest part of the Holocene. The data were acquired visually using an optical dark-field line scanner. We detect and describe melt layers and lens...
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EGU Copernicus
2022
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Online Access: | https://epic.awi.de/id/eprint/56092/ https://epic.awi.de/id/eprint/56092/1/westhoff2022cp.pdf https://doi.org/10.5194/cp-18-1011-2022 https://hdl.handle.net/10013/epic.20a42087-f123-425d-9641-3c717d6adaf8 |
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ftawi:oai:epic.awi.de:56092 2024-09-15T18:04:22+00:00 Melt in the Greenland EastGRIP ice core reveals Holocene warm events Westhoff, Julien Sinnl, Guilia Svensson, Anders Freitag, Johannes Kjær, Helle Astrid Vallelonga, Paul Vinther, B. M. Kipfstuhl, Sepp Dahl-Jensen, Dorthe Weikusat, Ilka 2022-05-10 application/pdf https://epic.awi.de/id/eprint/56092/ https://epic.awi.de/id/eprint/56092/1/westhoff2022cp.pdf https://doi.org/10.5194/cp-18-1011-2022 https://hdl.handle.net/10013/epic.20a42087-f123-425d-9641-3c717d6adaf8 unknown EGU Copernicus https://epic.awi.de/id/eprint/56092/1/westhoff2022cp.pdf Westhoff, J. , Sinnl, G. , Svensson, A. , Freitag, J. orcid:0000-0003-2654-9440 , Kjær, H. A. , Vallelonga, P. , Vinther, B. M. , Kipfstuhl, S. orcid:0000-0003-1495-5273 , Dahl-Jensen, D. and Weikusat, I. orcid:0000-0002-3023-6036 (2022) Melt in the Greenland EastGRIP ice core reveals Holocene warm events , Climate of the Past, 18 , pp. 1011-1034 . doi:10.5194/cp-18-1011-2022 <https://doi.org/10.5194/cp-18-1011-2022> , hdl:10013/epic.20a42087-f123-425d-9641-3c717d6adaf8 EPIC3Climate of the Past, EGU Copernicus, 18, pp. 1011-1034 Article isiRev 2022 ftawi https://doi.org/10.5194/cp-18-1011-2022 2024-06-24T04:28:46Z We present a record of melt events obtained from the East Greenland Ice Core Project (EastGRIP) ice core in central northeastern Greenland, covering the largest part of the Holocene. The data were acquired visually using an optical dark-field line scanner. We detect and describe melt layers and lenses, seen as bubble-free layers and lenses, throughout the ice above the bubble–clathrate transition. This transition is located at 1150 m depth in the EastGRIP ice core, corresponding to an age of 9720 years b2k. We define the brittle zone in the EastGRIP ice core as that from 650 to 950 m depth, where we count on average more than three core breaks per meter. We analyze melt layer thicknesses, correct for ice thinning, and account for missing layers due to core breaks. Our record of melt events shows a large, distinct peak around 1014 years b2k (986 CE) and a broad peak around 7000 years b2k, corresponding to the Holocene Climatic Optimum. In total, we can identify approximately 831 mm of melt (corrected for thinning) over the past 10 000 years. We find that the melt event from 986 CE is most likely a large rain event similar to that from 2012 CE, and that these two events are unprecedented throughout the Holocene. We also compare the most recent 2500 years to a tree ring composite and find an overlap between melt events and tree ring anomalies indicating warm summers. Considering the ice dynamics of the EastGRIP site resulting from the flow of the Northeast Greenland Ice Stream (NEGIS), we find that summer temperatures must have been at least 3 ± 0.6 ∘C warmer during the Early Holocene compared to today. Article in Journal/Newspaper East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Climate of the Past 18 5 1011 1034 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We present a record of melt events obtained from the East Greenland Ice Core Project (EastGRIP) ice core in central northeastern Greenland, covering the largest part of the Holocene. The data were acquired visually using an optical dark-field line scanner. We detect and describe melt layers and lenses, seen as bubble-free layers and lenses, throughout the ice above the bubble–clathrate transition. This transition is located at 1150 m depth in the EastGRIP ice core, corresponding to an age of 9720 years b2k. We define the brittle zone in the EastGRIP ice core as that from 650 to 950 m depth, where we count on average more than three core breaks per meter. We analyze melt layer thicknesses, correct for ice thinning, and account for missing layers due to core breaks. Our record of melt events shows a large, distinct peak around 1014 years b2k (986 CE) and a broad peak around 7000 years b2k, corresponding to the Holocene Climatic Optimum. In total, we can identify approximately 831 mm of melt (corrected for thinning) over the past 10 000 years. We find that the melt event from 986 CE is most likely a large rain event similar to that from 2012 CE, and that these two events are unprecedented throughout the Holocene. We also compare the most recent 2500 years to a tree ring composite and find an overlap between melt events and tree ring anomalies indicating warm summers. Considering the ice dynamics of the EastGRIP site resulting from the flow of the Northeast Greenland Ice Stream (NEGIS), we find that summer temperatures must have been at least 3 ± 0.6 ∘C warmer during the Early Holocene compared to today. |
format |
Article in Journal/Newspaper |
author |
Westhoff, Julien Sinnl, Guilia Svensson, Anders Freitag, Johannes Kjær, Helle Astrid Vallelonga, Paul Vinther, B. M. Kipfstuhl, Sepp Dahl-Jensen, Dorthe Weikusat, Ilka |
spellingShingle |
Westhoff, Julien Sinnl, Guilia Svensson, Anders Freitag, Johannes Kjær, Helle Astrid Vallelonga, Paul Vinther, B. M. Kipfstuhl, Sepp Dahl-Jensen, Dorthe Weikusat, Ilka Melt in the Greenland EastGRIP ice core reveals Holocene warm events |
author_facet |
Westhoff, Julien Sinnl, Guilia Svensson, Anders Freitag, Johannes Kjær, Helle Astrid Vallelonga, Paul Vinther, B. M. Kipfstuhl, Sepp Dahl-Jensen, Dorthe Weikusat, Ilka |
author_sort |
Westhoff, Julien |
title |
Melt in the Greenland EastGRIP ice core reveals Holocene warm events |
title_short |
Melt in the Greenland EastGRIP ice core reveals Holocene warm events |
title_full |
Melt in the Greenland EastGRIP ice core reveals Holocene warm events |
title_fullStr |
Melt in the Greenland EastGRIP ice core reveals Holocene warm events |
title_full_unstemmed |
Melt in the Greenland EastGRIP ice core reveals Holocene warm events |
title_sort |
melt in the greenland eastgrip ice core reveals holocene warm events |
publisher |
EGU Copernicus |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/56092/ https://epic.awi.de/id/eprint/56092/1/westhoff2022cp.pdf https://doi.org/10.5194/cp-18-1011-2022 https://hdl.handle.net/10013/epic.20a42087-f123-425d-9641-3c717d6adaf8 |
genre |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core |
genre_facet |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core |
op_source |
EPIC3Climate of the Past, EGU Copernicus, 18, pp. 1011-1034 |
op_relation |
https://epic.awi.de/id/eprint/56092/1/westhoff2022cp.pdf Westhoff, J. , Sinnl, G. , Svensson, A. , Freitag, J. orcid:0000-0003-2654-9440 , Kjær, H. A. , Vallelonga, P. , Vinther, B. M. , Kipfstuhl, S. orcid:0000-0003-1495-5273 , Dahl-Jensen, D. and Weikusat, I. orcid:0000-0002-3023-6036 (2022) Melt in the Greenland EastGRIP ice core reveals Holocene warm events , Climate of the Past, 18 , pp. 1011-1034 . doi:10.5194/cp-18-1011-2022 <https://doi.org/10.5194/cp-18-1011-2022> , hdl:10013/epic.20a42087-f123-425d-9641-3c717d6adaf8 |
op_doi |
https://doi.org/10.5194/cp-18-1011-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
5 |
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1011 |
op_container_end_page |
1034 |
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1810441852793389056 |