El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South
peer reviewed Paleoclimate archives, such as high-resolution ice core records, provide a means to investigate past climate variability. Until recently, the Law Dome (Dome Summit South site) ice core record remained one of few millennial-length high-resolution coastal records in East Antarctica. A ne...
Published in: | Climate of the Past |
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Format: | Article in Journal/Newspaper |
Language: | English |
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European Geosciences Union (EGU)
2021
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Online Access: | https://orbi.uliege.be/handle/2268/263160 https://orbi.uliege.be/bitstream/2268/263160/1/cp-17-1795-2021.pdf https://doi.org/10.5194/cp-17-1795-2021 |
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ftorbi:oai:orbi.ulg.ac.be:2268/263160 2024-10-20T14:03:38+00:00 El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South Crockart, Camillia K. Vance, Tessa R. Fraser, Alexander D. Abram, Nerilie J. Criscitiello, Alison S. Curran, Mark A.J. Favier, Vincent Gallant, Ailie J.E. Kittel, Christoph Kjaer, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei SPEHRES 2021-09-09 https://orbi.uliege.be/handle/2268/263160 https://orbi.uliege.be/bitstream/2268/263160/1/cp-17-1795-2021.pdf https://doi.org/10.5194/cp-17-1795-2021 en eng European Geosciences Union (EGU) urn:issn:1814-9324 urn:issn:1814-9332 https://orbi.uliege.be/handle/2268/263160 info:hdl:2268/263160 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Climate of the Past (2021-09-09) Antarctic El Niño Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2021 ftorbi https://doi.org/10.5194/cp-17-1795-2021 2024-09-30T14:23:32Z peer reviewed Paleoclimate archives, such as high-resolution ice core records, provide a means to investigate past climate variability. Until recently, the Law Dome (Dome Summit South site) ice core record remained one of few millennial-length high-resolution coastal records in East Antarctica. A new ice core drilled in 2017/2018 at Mount Brown South, approximately 1000 km west of Law Dome, provides an additional high-resolution record that will likely span the last millennium in the Indian Ocean sector of East Antarctica. Here, we compare snow accumulation rates and sea salt concentrations in the upper portion (∼ 20 m) of three Mount Brown South ice cores and an updated Law Dome record over the period 1975–2016. Annual sea salt concentrations from the Mount Brown South site record preserve a stronger signal for the El Niño–Southern Oscillation (ENSO; austral winter and spring, r = 0.533, p < 0.001, Multivariate El Niño Index) compared to a previously defined Law Dome record of summer sea salt concentrations (November–February, r = 0.398, p = 0.010, Southern Oscillation Index). The Mount Brown South site record and Law Dome record preserve inverse signals for the ENSO, possibly due to longitudinal variability in meridional transport in the southern Indian Ocean, although further analysis is needed to confirm this. We suggest that ENSO-related sea surface temperature anomalies in the equatorial Pacific drive atmospheric teleconnections in the southern mid-latitudes. These anomalies are associated with a weakening (strengthening) of regional westerly winds to the north of Mount Brown South that correspond to years of low (high) sea salt deposition at Mount Brown South during La Niña (El Niño) events. The extended Mount Brown South annual sea salt record (when complete) may offer a new proxy record for reconstructions of the ENSO over the recent millennium, along with improved understanding of regional atmospheric variability in the southern Indian Ocean, in addition to that derived from Law Dome. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core University of Liège: ORBi (Open Repository and Bibliography) Antarctic Austral East Antarctica Indian Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Mount Brown ENVELOPE(86.000,86.000,-68.617,-68.617) Pacific South Ice ENVELOPE(-29.867,-29.867,-81.950,-81.950) Climate of the Past 17 5 1795 1818 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Antarctic El Niño Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Antarctic El Niño Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Crockart, Camillia K. Vance, Tessa R. Fraser, Alexander D. Abram, Nerilie J. Criscitiello, Alison S. Curran, Mark A.J. Favier, Vincent Gallant, Ailie J.E. Kittel, Christoph Kjaer, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South |
topic_facet |
Antarctic El Niño Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed Paleoclimate archives, such as high-resolution ice core records, provide a means to investigate past climate variability. Until recently, the Law Dome (Dome Summit South site) ice core record remained one of few millennial-length high-resolution coastal records in East Antarctica. A new ice core drilled in 2017/2018 at Mount Brown South, approximately 1000 km west of Law Dome, provides an additional high-resolution record that will likely span the last millennium in the Indian Ocean sector of East Antarctica. Here, we compare snow accumulation rates and sea salt concentrations in the upper portion (∼ 20 m) of three Mount Brown South ice cores and an updated Law Dome record over the period 1975–2016. Annual sea salt concentrations from the Mount Brown South site record preserve a stronger signal for the El Niño–Southern Oscillation (ENSO; austral winter and spring, r = 0.533, p < 0.001, Multivariate El Niño Index) compared to a previously defined Law Dome record of summer sea salt concentrations (November–February, r = 0.398, p = 0.010, Southern Oscillation Index). The Mount Brown South site record and Law Dome record preserve inverse signals for the ENSO, possibly due to longitudinal variability in meridional transport in the southern Indian Ocean, although further analysis is needed to confirm this. We suggest that ENSO-related sea surface temperature anomalies in the equatorial Pacific drive atmospheric teleconnections in the southern mid-latitudes. These anomalies are associated with a weakening (strengthening) of regional westerly winds to the north of Mount Brown South that correspond to years of low (high) sea salt deposition at Mount Brown South during La Niña (El Niño) events. The extended Mount Brown South annual sea salt record (when complete) may offer a new proxy record for reconstructions of the ENSO over the recent millennium, along with improved understanding of regional atmospheric variability in the southern Indian Ocean, in addition to that derived from Law Dome. |
author2 |
SPEHRES |
format |
Article in Journal/Newspaper |
author |
Crockart, Camillia K. Vance, Tessa R. Fraser, Alexander D. Abram, Nerilie J. Criscitiello, Alison S. Curran, Mark A.J. Favier, Vincent Gallant, Ailie J.E. Kittel, Christoph Kjaer, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei |
author_facet |
Crockart, Camillia K. Vance, Tessa R. Fraser, Alexander D. Abram, Nerilie J. Criscitiello, Alison S. Curran, Mark A.J. Favier, Vincent Gallant, Ailie J.E. Kittel, Christoph Kjaer, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei |
author_sort |
Crockart, Camillia K. |
title |
El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South |
title_short |
El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South |
title_full |
El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South |
title_fullStr |
El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South |
title_full_unstemmed |
El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South |
title_sort |
el niño–southern oscillation signal in a new east antarctic ice core, mount brown south |
publisher |
European Geosciences Union (EGU) |
publishDate |
2021 |
url |
https://orbi.uliege.be/handle/2268/263160 https://orbi.uliege.be/bitstream/2268/263160/1/cp-17-1795-2021.pdf https://doi.org/10.5194/cp-17-1795-2021 |
long_lat |
ENVELOPE(112.833,112.833,-66.733,-66.733) ENVELOPE(86.000,86.000,-68.617,-68.617) ENVELOPE(-29.867,-29.867,-81.950,-81.950) |
geographic |
Antarctic Austral East Antarctica Indian Law Dome Mount Brown Pacific South Ice |
geographic_facet |
Antarctic Austral East Antarctica Indian Law Dome Mount Brown Pacific South Ice |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core |
op_source |
Climate of the Past (2021-09-09) |
op_relation |
urn:issn:1814-9324 urn:issn:1814-9332 https://orbi.uliege.be/handle/2268/263160 info:hdl:2268/263160 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-17-1795-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
5 |
container_start_page |
1795 |
op_container_end_page |
1818 |
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1813448676072226816 |