El Niño-Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South
International audience 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 Antarct...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , , , , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451/document https://hal-insu.archives-ouvertes.fr/insu-03706451/file/cp-17-1795-2021.pdf https://doi.org/10.5194/cp-17-1795-2021 |
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[SDU]Sciences of the Universe [physics] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Crockart, Camilla 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 Kjær, 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 |
[SDU]Sciences of the Universe [physics] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience 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 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Crockart, Camilla 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 Kjær, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei |
author_facet |
Crockart, Camilla 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 Kjær, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei |
author_sort |
Crockart, Camilla 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 |
HAL CCSD |
publishDate |
2021 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451/document https://hal-insu.archives-ouvertes.fr/insu-03706451/file/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 |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal-insu.archives-ouvertes.fr/insu-03706451 Climate of the Past, 2021, 17, pp.1795-1818. ⟨10.5194/cp-17-1795-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-1795-2021 insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451/document https://hal-insu.archives-ouvertes.fr/insu-03706451/file/cp-17-1795-2021.pdf BIBCODE: 2021CliPa.17.1795C doi:10.5194/cp-17-1795-2021 |
op_rights |
http://creativecommons.org/licenses/by/ 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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1766122079122358272 |
spelling |
ftunivnantes:oai:HAL:insu-03706451v1 2023-05-15T13:39:40+02:00 El Niño-Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South Crockart, Camilla 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 Kjær, Helle A. Klekociuk, Andrew R. Jong, Lenneke M. Moy, Andrew D. Plummer, Christopher T. Vallelonga, Paul T. Wille, Jonathan Zhang, Lingwei Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2021 https://hal-insu.archives-ouvertes.fr/insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451/document https://hal-insu.archives-ouvertes.fr/insu-03706451/file/cp-17-1795-2021.pdf https://doi.org/10.5194/cp-17-1795-2021 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-1795-2021 insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451 https://hal-insu.archives-ouvertes.fr/insu-03706451/document https://hal-insu.archives-ouvertes.fr/insu-03706451/file/cp-17-1795-2021.pdf BIBCODE: 2021CliPa.17.1795C doi:10.5194/cp-17-1795-2021 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal-insu.archives-ouvertes.fr/insu-03706451 Climate of the Past, 2021, 17, pp.1795-1818. ⟨10.5194/cp-17-1795-2021⟩ [SDU]Sciences of the Universe [physics] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.5194/cp-17-1795-2021 2023-03-01T01:36:24Z International audience 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 Université de Nantes: HAL-UNIV-NANTES 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 |