Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids
Much of Greenland experienced summers warmer than present in parts of the early to middle Holocene, during a precession‐driven positive anomaly in summer insolation. However, the magnitude of that warmth remains poorly known, and its timing and spatial pattern are uncertain. Here we describe the fir...
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crwiley:10.1111/bor.12247 2024-06-23T07:50:19+00:00 Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids Axford, Yarrow Levy, Laura B. Kelly, Meredith A. Francis, Donna R. Hall, Brenda L. Langdon, Peter G. Lowell, Thomas V. National Science Foundation 2017 http://dx.doi.org/10.1111/bor.12247 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12247 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12247 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12247 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12247 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 46, issue 4, page 678-687 ISSN 0300-9483 1502-3885 journal-article 2017 crwiley https://doi.org/10.1111/bor.12247 2024-06-06T04:21:09Z Much of Greenland experienced summers warmer than present in parts of the early to middle Holocene, during a precession‐driven positive anomaly in summer insolation. However, the magnitude of that warmth remains poorly known, and its timing and spatial pattern are uncertain. Here we describe the first quantitative Holocene palaeotemperature reconstruction from central East Greenland based upon insect (chironomid) assemblages preserved in lake sediments. We postulate that landscapes like our study site, characterized by minimal soil and vegetation development through the Holocene and thus little influenced by some important secondary gradients, are especially well suited to the use of chironomids to reconstruct Holocene temperatures. The inferred timing of warmth at our study site near Scoresby Sund agrees well with other nearby evidence, including glacial geological reconstructions and temperatures inferred from precipitation isotopes at Renland ice cap, supporting the use of chironomids to reconstruct temperatures at this site. We infer highest temperatures from c. 10 to 5.5 ka, followed by gradual cooling after 5.5 ka and progressively colder and less productive conditions after 3.5 ka. Models based upon two independent training sets yield similar inferred temperature trends, and suggest an average summer temperature anomaly from c. 10 to 5.5 ka of 3 to 4 °C relative to the preindustrial last millennium. The estimated overall rate of Neoglacial cooling averaged over the period from 5.5 to 0.5 ka was 0.6 to 0.8 °C per thousand years, more than twice the rate previously estimated for the Arctic as a whole. Given strong apparent spatial variability in Holocene climate around the Arctic, and the utility of palaeoclimate data for improving climate and ice‐sheet models, it should be a priority to further quantify past temperature changes around the margins of the Greenland Ice Sheet, where few quantitative reconstructions exist and future warming will affect global sea level. Article in Journal/Newspaper Arctic East Greenland Greenland Ice cap Ice Sheet Scoresby Sund Wiley Online Library Arctic Greenland Renland ENVELOPE(-26.750,-26.750,71.200,71.200) Scoresby ENVELOPE(162.750,162.750,-66.567,-66.567) Scoresby Sund ENVELOPE(-24.387,-24.387,70.476,70.476) Sund ENVELOPE(13.644,13.644,66.207,66.207) Boreas 46 4 678 687 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Much of Greenland experienced summers warmer than present in parts of the early to middle Holocene, during a precession‐driven positive anomaly in summer insolation. However, the magnitude of that warmth remains poorly known, and its timing and spatial pattern are uncertain. Here we describe the first quantitative Holocene palaeotemperature reconstruction from central East Greenland based upon insect (chironomid) assemblages preserved in lake sediments. We postulate that landscapes like our study site, characterized by minimal soil and vegetation development through the Holocene and thus little influenced by some important secondary gradients, are especially well suited to the use of chironomids to reconstruct Holocene temperatures. The inferred timing of warmth at our study site near Scoresby Sund agrees well with other nearby evidence, including glacial geological reconstructions and temperatures inferred from precipitation isotopes at Renland ice cap, supporting the use of chironomids to reconstruct temperatures at this site. We infer highest temperatures from c. 10 to 5.5 ka, followed by gradual cooling after 5.5 ka and progressively colder and less productive conditions after 3.5 ka. Models based upon two independent training sets yield similar inferred temperature trends, and suggest an average summer temperature anomaly from c. 10 to 5.5 ka of 3 to 4 °C relative to the preindustrial last millennium. The estimated overall rate of Neoglacial cooling averaged over the period from 5.5 to 0.5 ka was 0.6 to 0.8 °C per thousand years, more than twice the rate previously estimated for the Arctic as a whole. Given strong apparent spatial variability in Holocene climate around the Arctic, and the utility of palaeoclimate data for improving climate and ice‐sheet models, it should be a priority to further quantify past temperature changes around the margins of the Greenland Ice Sheet, where few quantitative reconstructions exist and future warming will affect global sea level. |
author2 |
National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Axford, Yarrow Levy, Laura B. Kelly, Meredith A. Francis, Donna R. Hall, Brenda L. Langdon, Peter G. Lowell, Thomas V. |
spellingShingle |
Axford, Yarrow Levy, Laura B. Kelly, Meredith A. Francis, Donna R. Hall, Brenda L. Langdon, Peter G. Lowell, Thomas V. Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids |
author_facet |
Axford, Yarrow Levy, Laura B. Kelly, Meredith A. Francis, Donna R. Hall, Brenda L. Langdon, Peter G. Lowell, Thomas V. |
author_sort |
Axford, Yarrow |
title |
Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids |
title_short |
Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids |
title_full |
Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids |
title_fullStr |
Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids |
title_full_unstemmed |
Timing and magnitude of early to middle Holocene warming in East Greenland inferred from chironomids |
title_sort |
timing and magnitude of early to middle holocene warming in east greenland inferred from chironomids |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/bor.12247 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12247 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12247 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12247 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12247 |
long_lat |
ENVELOPE(-26.750,-26.750,71.200,71.200) ENVELOPE(162.750,162.750,-66.567,-66.567) ENVELOPE(-24.387,-24.387,70.476,70.476) ENVELOPE(13.644,13.644,66.207,66.207) |
geographic |
Arctic Greenland Renland Scoresby Scoresby Sund Sund |
geographic_facet |
Arctic Greenland Renland Scoresby Scoresby Sund Sund |
genre |
Arctic East Greenland Greenland Ice cap Ice Sheet Scoresby Sund |
genre_facet |
Arctic East Greenland Greenland Ice cap Ice Sheet Scoresby Sund |
op_source |
Boreas volume 46, issue 4, page 678-687 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12247 |
container_title |
Boreas |
container_volume |
46 |
container_issue |
4 |
container_start_page |
678 |
op_container_end_page |
687 |
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1802641188256219136 |