Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula

The glacimarine environment of the Antarctic Peninsula region is one of the fastest warming places on Earth today, but details of changes in the recent past remain unknown. Large distances and widespread variability separate late Holocene palaeoclimate reconstructions in this region. This study focu...

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Published in:Polar Research
Main Authors: Alex Barnard, Julia S. Wellner, John B. Anderson
Format: Article in Journal/Newspaper
Language:English
Published: Norwegian Polar Institute 2014
Subjects:
geo
Online Access:https://doi.org/10.3402/polar.v33.17236
https://doaj.org/article/7afe35cd4b004349aedfeb08af36d8b4
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spelling fttriple:oai:gotriple.eu:oai:doaj.org/article:7afe35cd4b004349aedfeb08af36d8b4 2023-05-15T14:02:15+02:00 Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula Alex Barnard Julia S. Wellner John B. Anderson 2014-06-01 https://doi.org/10.3402/polar.v33.17236 https://doaj.org/article/7afe35cd4b004349aedfeb08af36d8b4 en eng Norwegian Polar Institute 1751-8369 doi:10.3402/polar.v33.17236 https://doaj.org/article/7afe35cd4b004349aedfeb08af36d8b4 undefined Polar Research, Vol 33, Iss 0, Pp 1-13 (2014) Antarctic Peninsula palaeoclimate Holocene marine isotopes geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2014 fttriple https://doi.org/10.3402/polar.v33.17236 2023-01-22T19:28:13Z The glacimarine environment of the Antarctic Peninsula region is one of the fastest warming places on Earth today, but details of changes in the recent past remain unknown. Large distances and widespread variability separate late Holocene palaeoclimate reconstructions in this region. This study focuses on a marine sediment core collected from ca. 2000 m below sea level in the Central Bransfield Strait that serves as a key for understanding changes in this region. The core yielded a high sedimentation rate and therefore provides an exceptional high-resolution sedimentary record composed of hemipelagic sediment, with some turbidites. An age model has been created using radiocarbon dates that span the Late Holocene: 3560 cal yr BP to present. This chronostratigraphic framework was used to establish five units, which are grouped into two super-units: a lower super-unit (3560–1600 cal yr BP) and an upper super-unit (1600 cal yr BP–present), based on facies descriptions, laser particle size analysis, x-ray analysis, multi-sensor core logger data, weight percentages and isotopic values of total organic carbon and nitrogen. We interpret the signal contained within the upper super-unit as an increase in surface water irradiance and/or shortening of the sea-ice season and the five units are broadly synchronous with climatic intervals across the Antarctic Peninsula region. While the general trends of regional climatic periods are represented in the Bransfield Basin core we have examined, each additional record that is obtained adds variability to the known history of the Antarctic Peninsula, rather than clarifying specific trends. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bransfield Strait Polar Research Sea ice Unknown Antarctic The Antarctic Antarctic Peninsula Bransfield Strait Polar Research 33 1 17236
institution Open Polar
collection Unknown
op_collection_id fttriple
language English
topic Antarctic Peninsula
palaeoclimate
Holocene
marine
isotopes
geo
spellingShingle Antarctic Peninsula
palaeoclimate
Holocene
marine
isotopes
geo
Alex Barnard
Julia S. Wellner
John B. Anderson
Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
topic_facet Antarctic Peninsula
palaeoclimate
Holocene
marine
isotopes
geo
description The glacimarine environment of the Antarctic Peninsula region is one of the fastest warming places on Earth today, but details of changes in the recent past remain unknown. Large distances and widespread variability separate late Holocene palaeoclimate reconstructions in this region. This study focuses on a marine sediment core collected from ca. 2000 m below sea level in the Central Bransfield Strait that serves as a key for understanding changes in this region. The core yielded a high sedimentation rate and therefore provides an exceptional high-resolution sedimentary record composed of hemipelagic sediment, with some turbidites. An age model has been created using radiocarbon dates that span the Late Holocene: 3560 cal yr BP to present. This chronostratigraphic framework was used to establish five units, which are grouped into two super-units: a lower super-unit (3560–1600 cal yr BP) and an upper super-unit (1600 cal yr BP–present), based on facies descriptions, laser particle size analysis, x-ray analysis, multi-sensor core logger data, weight percentages and isotopic values of total organic carbon and nitrogen. We interpret the signal contained within the upper super-unit as an increase in surface water irradiance and/or shortening of the sea-ice season and the five units are broadly synchronous with climatic intervals across the Antarctic Peninsula region. While the general trends of regional climatic periods are represented in the Bransfield Basin core we have examined, each additional record that is obtained adds variability to the known history of the Antarctic Peninsula, rather than clarifying specific trends.
format Article in Journal/Newspaper
author Alex Barnard
Julia S. Wellner
John B. Anderson
author_facet Alex Barnard
Julia S. Wellner
John B. Anderson
author_sort Alex Barnard
title Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
title_short Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
title_full Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
title_fullStr Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
title_full_unstemmed Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula
title_sort late holocene climate change recorded in proxy records from a bransfield basin sediment core, antarctic peninsula
publisher Norwegian Polar Institute
publishDate 2014
url https://doi.org/10.3402/polar.v33.17236
https://doaj.org/article/7afe35cd4b004349aedfeb08af36d8b4
geographic Antarctic
The Antarctic
Antarctic Peninsula
Bransfield Strait
geographic_facet Antarctic
The Antarctic
Antarctic Peninsula
Bransfield Strait
genre Antarc*
Antarctic
Antarctic Peninsula
Bransfield Strait
Polar Research
Sea ice
genre_facet Antarc*
Antarctic
Antarctic Peninsula
Bransfield Strait
Polar Research
Sea ice
op_source Polar Research, Vol 33, Iss 0, Pp 1-13 (2014)
op_relation 1751-8369
doi:10.3402/polar.v33.17236
https://doaj.org/article/7afe35cd4b004349aedfeb08af36d8b4
op_rights undefined
op_doi https://doi.org/10.3402/polar.v33.17236
container_title Polar Research
container_volume 33
container_issue 1
container_start_page 17236
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