Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated?
Noble gases in ice cores enable reconstructions of past mean ocean temperature. A recent result from the clathrate‐containing WAIS Divide Ice Core showed tight covariation between ocean and Antarctic temperatures throughout the last deglaciation, except for the Younger Dryas interval. In the beginni...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2019GL082971 |
id |
ftempa:oai:dora:empa_19225 |
---|---|
record_format |
openpolar |
spelling |
ftempa:oai:dora:empa_19225 2024-09-15T17:47:29+00:00 Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? Shackleton, S. Bereiter, B. Baggenstos, D. Bauska, T.K. Brook, E.J. Marcott, S.A. Severinghaus, J.P. 2019 https://doi.org/10.1029/2019GL082971 eng eng Wiley Geophysical Research Letters--Geophys. Res. Lett.--0094-8276--journals:1144 empa:19225 issn: 0094-8276 e-issn: journal id: journals:1144 doi:10.1029/2019GL082971 uri: ut: 000477616200033 scopus: 2-s2.0-85067661640 pmid: local: Journal Article Text 2019 ftempa https://doi.org/10.1029/2019GL082971 2024-09-04T03:37:35Z Noble gases in ice cores enable reconstructions of past mean ocean temperature. A recent result from the clathrate‐containing WAIS Divide Ice Core showed tight covariation between ocean and Antarctic temperatures throughout the last deglaciation, except for the Younger Dryas interval. In the beginning of this interval oceans warmed at 2.5°C/kyr ‐ three times greater than estimates of modern warming. If valid, this challenges our understanding of the mechanisms controlling ocean heat uptake. Here we reconstruct mean ocean temperature with clathrate‐free ice samples from Taylor Glacier to test these findings. The two records agree in net temperature change over the Younger Dryas, but the Taylor Glacier record suggests sustained warming at the more modest rate of 1.1 ± 0.2°C/kyr. We explore mechanisms to explain differences between records and suggest that the noble gas content for the Younger Dryas interval of WAIS Divide may have been altered by a decimeter‐scale fractionation during bubble‐clathrate transformation. Article in Journal/Newspaper Antarc* Antarctic ice core Taylor Glacier DORA Empa Geophysical Research Letters 46 11 5928 5936 |
institution |
Open Polar |
collection |
DORA Empa |
op_collection_id |
ftempa |
language |
English |
description |
Noble gases in ice cores enable reconstructions of past mean ocean temperature. A recent result from the clathrate‐containing WAIS Divide Ice Core showed tight covariation between ocean and Antarctic temperatures throughout the last deglaciation, except for the Younger Dryas interval. In the beginning of this interval oceans warmed at 2.5°C/kyr ‐ three times greater than estimates of modern warming. If valid, this challenges our understanding of the mechanisms controlling ocean heat uptake. Here we reconstruct mean ocean temperature with clathrate‐free ice samples from Taylor Glacier to test these findings. The two records agree in net temperature change over the Younger Dryas, but the Taylor Glacier record suggests sustained warming at the more modest rate of 1.1 ± 0.2°C/kyr. We explore mechanisms to explain differences between records and suggest that the noble gas content for the Younger Dryas interval of WAIS Divide may have been altered by a decimeter‐scale fractionation during bubble‐clathrate transformation. |
format |
Article in Journal/Newspaper |
author |
Shackleton, S. Bereiter, B. Baggenstos, D. Bauska, T.K. Brook, E.J. Marcott, S.A. Severinghaus, J.P. |
spellingShingle |
Shackleton, S. Bereiter, B. Baggenstos, D. Bauska, T.K. Brook, E.J. Marcott, S.A. Severinghaus, J.P. Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? |
author_facet |
Shackleton, S. Bereiter, B. Baggenstos, D. Bauska, T.K. Brook, E.J. Marcott, S.A. Severinghaus, J.P. |
author_sort |
Shackleton, S. |
title |
Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? |
title_short |
Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? |
title_full |
Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? |
title_fullStr |
Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? |
title_full_unstemmed |
Is the noble gas‐based rate of ocean warming during the Younger Dryas overestimated? |
title_sort |
is the noble gas‐based rate of ocean warming during the younger dryas overestimated? |
publisher |
Wiley |
publishDate |
2019 |
url |
https://doi.org/10.1029/2019GL082971 |
genre |
Antarc* Antarctic ice core Taylor Glacier |
genre_facet |
Antarc* Antarctic ice core Taylor Glacier |
op_relation |
Geophysical Research Letters--Geophys. Res. Lett.--0094-8276--journals:1144 empa:19225 issn: 0094-8276 e-issn: journal id: journals:1144 doi:10.1029/2019GL082971 uri: ut: 000477616200033 scopus: 2-s2.0-85067661640 pmid: local: |
op_doi |
https://doi.org/10.1029/2019GL082971 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
11 |
container_start_page |
5928 |
op_container_end_page |
5936 |
_version_ |
1810496845987708928 |