The Southern Hemisphere at glacial terminations: insights from the Dome C ice core

The many different proxy records from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core allow for the first time a comparison of nine glacial terminations in great detail. Despite the fact that all terminations cover the transition from a glacial maximum into an interglacial,...

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Main Authors: R. Röthlisberger, M. Mudelsee, M. Bigler, M. de Angelis, H. Fischer, M. Hansson, F. Lambert, V. Masson-Delmotte, L. Sime, R. Udisti, E. W. Wolff
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2008
Subjects:
geo
Online Access:http://www.clim-past.net/4/345/2008/cp-4-345-2008.pdf
https://doaj.org/article/c645212a8a9349138b0f284350f35580
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spelling fttriple:oai:gotriple.eu:oai:doaj.org/article:c645212a8a9349138b0f284350f35580 2023-05-15T13:38:31+02:00 The Southern Hemisphere at glacial terminations: insights from the Dome C ice core R. Röthlisberger M. Mudelsee M. Bigler M. de Angelis H. Fischer M. Hansson F. Lambert V. Masson-Delmotte L. Sime R. Udisti E. W. Wolff 2008-12-01 http://www.clim-past.net/4/345/2008/cp-4-345-2008.pdf https://doaj.org/article/c645212a8a9349138b0f284350f35580 en eng Copernicus Publications 1814-9324 1814-9332 http://www.clim-past.net/4/345/2008/cp-4-345-2008.pdf https://doaj.org/article/c645212a8a9349138b0f284350f35580 undefined Climate of the Past, Vol 4, Iss 4, Pp 345-356 (2008) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2008 fttriple 2023-01-22T19:05:44Z The many different proxy records from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core allow for the first time a comparison of nine glacial terminations in great detail. Despite the fact that all terminations cover the transition from a glacial maximum into an interglacial, there are large differences between single terminations. For some terminations, Antarctic temperature increased only moderately, while for others, the amplitude of change at the termination was much larger. For the different terminations, the rate of change in temperature is more similar than the magnitude or duration of change. These temperature changes were accompanied by vast changes in dust and sea salt deposition all over Antarctica. Here we investigate the phasing between a South American dust proxy (non-sea-salt calcium flux, nssCa2+), a sea ice proxy (sea salt sodium flux, ssNa+) and a proxy for Antarctic temperature (deuterium, δD). In particular, we look into whether a similar sequence of events applies to all terminations, despite their different characteristics. All proxies are derived from the EPICA Dome C ice core, resulting in a relative dating uncertainty between the proxies of less than 20 years. At the start of the terminations, the temperature (δD) increase and dust (nssCa2+ flux) decrease start synchronously. The sea ice proxy (ssNa+ flux), however, only changes once the temperature has reached a particular threshold, approximately 5°C below present day temperatures (corresponding to a δD value of −420‰). This reflects to a large extent the limited sensitivity of the sea ice proxy during very cold periods with large sea ice extent. At terminations where this threshold is not reached (TVI, TVIII), ssNa+ flux shows no changes. Above this threshold, the sea ice proxy is closely coupled to the Antarctic temperature, and interglacial levels are reached at the same time for both ssNa+ and δD. On the other hand, once another threshold at approximately 2°C below present day temperature is passed ... Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Sea ice Unknown Antarctic The Antarctic
institution Open Polar
collection Unknown
op_collection_id fttriple
language English
topic geo
envir
spellingShingle geo
envir
R. Röthlisberger
M. Mudelsee
M. Bigler
M. de Angelis
H. Fischer
M. Hansson
F. Lambert
V. Masson-Delmotte
L. Sime
R. Udisti
E. W. Wolff
The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
topic_facet geo
envir
description The many different proxy records from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core allow for the first time a comparison of nine glacial terminations in great detail. Despite the fact that all terminations cover the transition from a glacial maximum into an interglacial, there are large differences between single terminations. For some terminations, Antarctic temperature increased only moderately, while for others, the amplitude of change at the termination was much larger. For the different terminations, the rate of change in temperature is more similar than the magnitude or duration of change. These temperature changes were accompanied by vast changes in dust and sea salt deposition all over Antarctica. Here we investigate the phasing between a South American dust proxy (non-sea-salt calcium flux, nssCa2+), a sea ice proxy (sea salt sodium flux, ssNa+) and a proxy for Antarctic temperature (deuterium, δD). In particular, we look into whether a similar sequence of events applies to all terminations, despite their different characteristics. All proxies are derived from the EPICA Dome C ice core, resulting in a relative dating uncertainty between the proxies of less than 20 years. At the start of the terminations, the temperature (δD) increase and dust (nssCa2+ flux) decrease start synchronously. The sea ice proxy (ssNa+ flux), however, only changes once the temperature has reached a particular threshold, approximately 5°C below present day temperatures (corresponding to a δD value of −420‰). This reflects to a large extent the limited sensitivity of the sea ice proxy during very cold periods with large sea ice extent. At terminations where this threshold is not reached (TVI, TVIII), ssNa+ flux shows no changes. Above this threshold, the sea ice proxy is closely coupled to the Antarctic temperature, and interglacial levels are reached at the same time for both ssNa+ and δD. On the other hand, once another threshold at approximately 2°C below present day temperature is passed ...
format Article in Journal/Newspaper
author R. Röthlisberger
M. Mudelsee
M. Bigler
M. de Angelis
H. Fischer
M. Hansson
F. Lambert
V. Masson-Delmotte
L. Sime
R. Udisti
E. W. Wolff
author_facet R. Röthlisberger
M. Mudelsee
M. Bigler
M. de Angelis
H. Fischer
M. Hansson
F. Lambert
V. Masson-Delmotte
L. Sime
R. Udisti
E. W. Wolff
author_sort R. Röthlisberger
title The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
title_short The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
title_full The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
title_fullStr The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
title_full_unstemmed The Southern Hemisphere at glacial terminations: insights from the Dome C ice core
title_sort southern hemisphere at glacial terminations: insights from the dome c ice core
publisher Copernicus Publications
publishDate 2008
url http://www.clim-past.net/4/345/2008/cp-4-345-2008.pdf
https://doaj.org/article/c645212a8a9349138b0f284350f35580
geographic Antarctic
The Antarctic
geographic_facet Antarctic
The Antarctic
genre Antarc*
Antarctic
Antarctica
EPICA
ice core
Sea ice
genre_facet Antarc*
Antarctic
Antarctica
EPICA
ice core
Sea ice
op_source Climate of the Past, Vol 4, Iss 4, Pp 345-356 (2008)
op_relation 1814-9324
1814-9332
http://www.clim-past.net/4/345/2008/cp-4-345-2008.pdf
https://doaj.org/article/c645212a8a9349138b0f284350f35580
op_rights undefined
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