10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland
We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines c...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2016
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/3fs4m51t |
id |
ftcdlib:oai:escholarship.org/ark:/13030/qt3fs4m51t |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org/ark:/13030/qt3fs4m51t 2023-05-15T16:26:27+02:00 10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland Cronauer, SL Briner, JP Kelley, SE Zimmerman, SRH Morlighem, M 2016-09-01 application/pdf https://escholarship.org/uc/item/3fs4m51t unknown eScholarship, University of California qt3fs4m51t https://escholarship.org/uc/item/3fs4m51t public Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology article 2016 ftcdlib 2021-06-28T17:06:43Z We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines constrain local deglaciation to ∼9.9±0.6ka (n=2). Three Drygalski Moraine crests yield mean 10Be ages of 8.6±0.4ka (n=2), 8.5±0.2ka (n=3), and 7.6±0.1ka (n=2) from outer to inner. Perched erratics between the inner two moraines average 7.8±0.1ka (n=2) and are consistent with the moraine ages. Sediments from a proglacial lake with a catchment area extending an estimated 2km beneath (inland of) the present ice sheet terminus constrain an ice sheet minimum extent from 5.4ka to 0.6ka. The moraine chronology paired with the lake sediment stratigraphy reveals that the ice margin likely remained within ∼2km of its present position from ∼9.9 to 5.4ka. This unexpected early Holocene stability, preceded by rapid ice retreat and followed by minimum ice extent between ∼5.4 and 0.6ka, contrasts with many records of early Holocene warmth and the Northern Hemisphere summer insolation maximum. We suggest ice margin stability may instead be tied to adjacent ocean temperatures, which reached an optimum in the middle Holocene. Article in Journal/Newspaper Greenland Ice Sheet Nuussuaq University of California: eScholarship Drygalski ENVELOPE(-61.000,-61.000,-64.717,-64.717) Greenland Nuussuaq ENVELOPE(-51.918,-51.918,66.626,66.626) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology |
spellingShingle |
Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology Cronauer, SL Briner, JP Kelley, SE Zimmerman, SRH Morlighem, M 10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
topic_facet |
Cosmogenic nuclide exposure dating Greenland Ice Sheet Proglacial-threshold lake Holocene Earth Sciences History and Archaeology Paleontology |
description |
We reconstruct the history of the Greenland Ice Sheet margin on the Nuussuaq Peninsula in central West Greenland through the Holocene using lake sediment analysis and cosmogenic 10Be exposure dating of the prominent Drygalski Moraines. Erratics perched on bedrock outboard of the Drygalski Moraines constrain local deglaciation to ∼9.9±0.6ka (n=2). Three Drygalski Moraine crests yield mean 10Be ages of 8.6±0.4ka (n=2), 8.5±0.2ka (n=3), and 7.6±0.1ka (n=2) from outer to inner. Perched erratics between the inner two moraines average 7.8±0.1ka (n=2) and are consistent with the moraine ages. Sediments from a proglacial lake with a catchment area extending an estimated 2km beneath (inland of) the present ice sheet terminus constrain an ice sheet minimum extent from 5.4ka to 0.6ka. The moraine chronology paired with the lake sediment stratigraphy reveals that the ice margin likely remained within ∼2km of its present position from ∼9.9 to 5.4ka. This unexpected early Holocene stability, preceded by rapid ice retreat and followed by minimum ice extent between ∼5.4 and 0.6ka, contrasts with many records of early Holocene warmth and the Northern Hemisphere summer insolation maximum. We suggest ice margin stability may instead be tied to adjacent ocean temperatures, which reached an optimum in the middle Holocene. |
format |
Article in Journal/Newspaper |
author |
Cronauer, SL Briner, JP Kelley, SE Zimmerman, SRH Morlighem, M |
author_facet |
Cronauer, SL Briner, JP Kelley, SE Zimmerman, SRH Morlighem, M |
author_sort |
Cronauer, SL |
title |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_short |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_full |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_fullStr |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_full_unstemmed |
10Be dating reveals early-middle Holocene age of the Drygalski Moraines in central West Greenland |
title_sort |
10be dating reveals early-middle holocene age of the drygalski moraines in central west greenland |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
https://escholarship.org/uc/item/3fs4m51t |
long_lat |
ENVELOPE(-61.000,-61.000,-64.717,-64.717) ENVELOPE(-51.918,-51.918,66.626,66.626) |
geographic |
Drygalski Greenland Nuussuaq |
geographic_facet |
Drygalski Greenland Nuussuaq |
genre |
Greenland Ice Sheet Nuussuaq |
genre_facet |
Greenland Ice Sheet Nuussuaq |
op_relation |
qt3fs4m51t https://escholarship.org/uc/item/3fs4m51t |
op_rights |
public |
_version_ |
1766015378305056768 |