Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments
Predicting the response of the Greenland Ice Sheet to future climate change presents a major challenge to climate science. Paleoclimate data from Greenland can provide empirical constraints on past cryospheric responses to climate change, complementing insights from contemporary observations and fro...
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ftsouthampton:oai:eprints.soton.ac.uk:354012 2023-07-30T04:03:46+02:00 Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments Axford, Yarrow Losee, Shanna Briner, Jason P. Francis, Donna R. Langdon, Peter G. Walker, Ian R. 2013-01-03 https://eprints.soton.ac.uk/354012/ English eng Axford, Yarrow, Losee, Shanna, Briner, Jason P., Francis, Donna R., Langdon, Peter G. and Walker, Ian R. (2013) Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments. Quaternary Science Reviews, 59, 87-100. (doi:10.1016/j.quascirev.2012.10.024 <http://dx.doi.org/10.1016/j.quascirev.2012.10.024>). Article PeerReviewed 2013 ftsouthampton https://doi.org/10.1016/j.quascirev.2012.10.024 2023-07-09T21:47:28Z Predicting the response of the Greenland Ice Sheet to future climate change presents a major challenge to climate science. Paleoclimate data from Greenland can provide empirical constraints on past cryospheric responses to climate change, complementing insights from contemporary observations and from modeling. Here we examine sedimentary records from five lakes near Jakobshavn Isbræ in central West Greenland to investigate the timing and magnitude of major Holocene climate changes, for comparison with glacial geologic reconstructions from the region. A primary objective of this study is to constrain the timing and magnitude of maximum warmth during the early to middle Holocene positive anomaly in summer insolation. Temperature reconstructions from subfossil insect (chironomid) assemblages suggest that summer temperatures were warmer than present by at least 7.1 ka (the beginning of the North Lake record; ka = thousands of years before present), and that the warmest millennia of the Holocene occurred in the study area between 6 and 4 ka. Previous studies in the Jakobshavn region have found that the local Greenland Ice Sheet margin was most retracted behind its present position between 6 and 5 ka, and here we use chironomids to estimate that local summer temperatures were 2–3 °C warmer than present during that time of minimum ice sheet extent. As summer insolation declined through the late Holocene, summer temperatures cooled and the local ice sheet margin expanded. Gradual, insolation-driven millennial-scale temperature trends in the study area were punctuated by several abrupt climate changes, including a major transient event recorded in all five lakes between 4.3 and 3.2 ka, which overlaps in timing with abrupt climate changes previously documented around the North Atlantic region and farther afield at ?4.2 ka. Article in Journal/Newspaper Greenland Ice Sheet Jakobshavn Jakobshavn isbræ North Atlantic University of Southampton: e-Prints Soton Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) Quaternary Science Reviews 59 87 100 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Predicting the response of the Greenland Ice Sheet to future climate change presents a major challenge to climate science. Paleoclimate data from Greenland can provide empirical constraints on past cryospheric responses to climate change, complementing insights from contemporary observations and from modeling. Here we examine sedimentary records from five lakes near Jakobshavn Isbræ in central West Greenland to investigate the timing and magnitude of major Holocene climate changes, for comparison with glacial geologic reconstructions from the region. A primary objective of this study is to constrain the timing and magnitude of maximum warmth during the early to middle Holocene positive anomaly in summer insolation. Temperature reconstructions from subfossil insect (chironomid) assemblages suggest that summer temperatures were warmer than present by at least 7.1 ka (the beginning of the North Lake record; ka = thousands of years before present), and that the warmest millennia of the Holocene occurred in the study area between 6 and 4 ka. Previous studies in the Jakobshavn region have found that the local Greenland Ice Sheet margin was most retracted behind its present position between 6 and 5 ka, and here we use chironomids to estimate that local summer temperatures were 2–3 °C warmer than present during that time of minimum ice sheet extent. As summer insolation declined through the late Holocene, summer temperatures cooled and the local ice sheet margin expanded. Gradual, insolation-driven millennial-scale temperature trends in the study area were punctuated by several abrupt climate changes, including a major transient event recorded in all five lakes between 4.3 and 3.2 ka, which overlaps in timing with abrupt climate changes previously documented around the North Atlantic region and farther afield at ?4.2 ka. |
format |
Article in Journal/Newspaper |
author |
Axford, Yarrow Losee, Shanna Briner, Jason P. Francis, Donna R. Langdon, Peter G. Walker, Ian R. |
spellingShingle |
Axford, Yarrow Losee, Shanna Briner, Jason P. Francis, Donna R. Langdon, Peter G. Walker, Ian R. Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments |
author_facet |
Axford, Yarrow Losee, Shanna Briner, Jason P. Francis, Donna R. Langdon, Peter G. Walker, Ian R. |
author_sort |
Axford, Yarrow |
title |
Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments |
title_short |
Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments |
title_full |
Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments |
title_fullStr |
Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments |
title_full_unstemmed |
Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments |
title_sort |
holocene temperature history at the western greenland ice sheet margin reconstructed from lake sediments |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/354012/ |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Greenland Jakobshavn Isbræ |
geographic_facet |
Greenland Jakobshavn Isbræ |
genre |
Greenland Ice Sheet Jakobshavn Jakobshavn isbræ North Atlantic |
genre_facet |
Greenland Ice Sheet Jakobshavn Jakobshavn isbræ North Atlantic |
op_relation |
Axford, Yarrow, Losee, Shanna, Briner, Jason P., Francis, Donna R., Langdon, Peter G. and Walker, Ian R. (2013) Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments. Quaternary Science Reviews, 59, 87-100. (doi:10.1016/j.quascirev.2012.10.024 <http://dx.doi.org/10.1016/j.quascirev.2012.10.024>). |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.10.024 |
container_title |
Quaternary Science Reviews |
container_volume |
59 |
container_start_page |
87 |
op_container_end_page |
100 |
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1772814846583111680 |