Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland
The observational record of ice margin position reveals asynchrony in both the timing and magnitude of Greenland Ice Sheet (GrIS) margin fluctuations and illustrates the complex reactions of ice sheets to climatic perturbations. In this study, we reconstruct the timing and pattern of middle- and lat...
Published in: | The Holocene |
---|---|
Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
SAGE Publications
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1177/0959683618761541 http://journals.sagepub.com/doi/pdf/10.1177/0959683618761541 http://journals.sagepub.com/doi/full-xml/10.1177/0959683618761541 |
id |
crsagepubl:10.1177/0959683618761541 |
---|---|
record_format |
openpolar |
spelling |
crsagepubl:10.1177/0959683618761541 2023-05-15T16:27:23+02:00 Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland Kelley, Samuel E Briner, Jason P O’Hara, Sandy L Directorate for Geosciences 2018 http://dx.doi.org/10.1177/0959683618761541 http://journals.sagepub.com/doi/pdf/10.1177/0959683618761541 http://journals.sagepub.com/doi/full-xml/10.1177/0959683618761541 en eng SAGE Publications http://www.sagepub.com/licence-information-for-chorus The Holocene volume 28, issue 7, page 1160-1172 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2018 crsagepubl https://doi.org/10.1177/0959683618761541 2022-09-21T19:47:46Z The observational record of ice margin position reveals asynchrony in both the timing and magnitude of Greenland Ice Sheet (GrIS) margin fluctuations and illustrates the complex reactions of ice sheets to climatic perturbations. In this study, we reconstruct the timing and pattern of middle- and late-Holocene GrIS margin fluctuations at two locations, ~190 km apart, in central West Greenland using radiocarbon-dated sediment cores from proglacial-threshold lakes. Our results demonstrate that deglaciation occurs at both sites during the early Holocene, with the ice sheet remaining in a smaller-than-present ice margin configuration until ~500 years ago when it readvanced into lake catchments at both sites. At our northern site, Sermeq Kujatdleq, the late-Holocene advance of the GrIS approached maximum position during the past 280 years, with the culmination of the advance occurring at AD 1992–1994, and modern retreat was underway by AD 1998–2001. In contrast, field and observational evidence suggest that the GrIS at our southern site, Nordenskiöld Gletscher, has been advancing or stable throughout the 20th century. These results, in conjunction with previous work in the region, highlight the asynchronous nature of late-Holocene advances and subsequent modern retreat, implying that local variability, such as ice velocity or ice dynamics, is responsible for modulating ice margin response to changes in climate on these decadal to centennial timescales. Additional high-resolution records of past ice sheet fluctuations are needed to inform and more accurately constrain our predictions of future cryosphere response to changes in climate. Article in Journal/Newspaper Greenland Ice Sheet SAGE Publications (via Crossref) Greenland The Holocene 28 7 1160 1172 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Kelley, Samuel E Briner, Jason P O’Hara, Sandy L Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
The observational record of ice margin position reveals asynchrony in both the timing and magnitude of Greenland Ice Sheet (GrIS) margin fluctuations and illustrates the complex reactions of ice sheets to climatic perturbations. In this study, we reconstruct the timing and pattern of middle- and late-Holocene GrIS margin fluctuations at two locations, ~190 km apart, in central West Greenland using radiocarbon-dated sediment cores from proglacial-threshold lakes. Our results demonstrate that deglaciation occurs at both sites during the early Holocene, with the ice sheet remaining in a smaller-than-present ice margin configuration until ~500 years ago when it readvanced into lake catchments at both sites. At our northern site, Sermeq Kujatdleq, the late-Holocene advance of the GrIS approached maximum position during the past 280 years, with the culmination of the advance occurring at AD 1992–1994, and modern retreat was underway by AD 1998–2001. In contrast, field and observational evidence suggest that the GrIS at our southern site, Nordenskiöld Gletscher, has been advancing or stable throughout the 20th century. These results, in conjunction with previous work in the region, highlight the asynchronous nature of late-Holocene advances and subsequent modern retreat, implying that local variability, such as ice velocity or ice dynamics, is responsible for modulating ice margin response to changes in climate on these decadal to centennial timescales. Additional high-resolution records of past ice sheet fluctuations are needed to inform and more accurately constrain our predictions of future cryosphere response to changes in climate. |
author2 |
Directorate for Geosciences |
format |
Article in Journal/Newspaper |
author |
Kelley, Samuel E Briner, Jason P O’Hara, Sandy L |
author_facet |
Kelley, Samuel E Briner, Jason P O’Hara, Sandy L |
author_sort |
Kelley, Samuel E |
title |
Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland |
title_short |
Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland |
title_full |
Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland |
title_fullStr |
Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland |
title_full_unstemmed |
Assessing ice margin fluctuations on differing timescales: Chronological constraints from Sermeq Kujatdleq and Nordenskiöld Gletscher, central West Greenland |
title_sort |
assessing ice margin fluctuations on differing timescales: chronological constraints from sermeq kujatdleq and nordenskiöld gletscher, central west greenland |
publisher |
SAGE Publications |
publishDate |
2018 |
url |
http://dx.doi.org/10.1177/0959683618761541 http://journals.sagepub.com/doi/pdf/10.1177/0959683618761541 http://journals.sagepub.com/doi/full-xml/10.1177/0959683618761541 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
The Holocene volume 28, issue 7, page 1160-1172 ISSN 0959-6836 1477-0911 |
op_rights |
http://www.sagepub.com/licence-information-for-chorus |
op_doi |
https://doi.org/10.1177/0959683618761541 |
container_title |
The Holocene |
container_volume |
28 |
container_issue |
7 |
container_start_page |
1160 |
op_container_end_page |
1172 |
_version_ |
1766016541149626368 |