El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South
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 dri...
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ftcopernicus:oai:publications.copernicus.org:cp90385 2023-05-15T14:02:17+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 2021-10-05 application/pdf https://doi.org/10.5194/cp-17-1795-2021 https://cp.copernicus.org/articles/17/1795/2021/ eng eng doi:10.5194/cp-17-1795-2021 https://cp.copernicus.org/articles/17/1795/2021/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-17-1795-2021 2021-10-11T16:22:29Z 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. Text Antarc* Antarctic Antarctica East Antarctica ice core Copernicus Publications: E-Journals 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 |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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. |
format |
Text |
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 |
spellingShingle |
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 |
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 |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1795-2021 https://cp.copernicus.org/articles/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 |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-1795-2021 https://cp.copernicus.org/articles/17/1795/2021/ |
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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1766272466196365312 |