Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica
The El Nio-Southern Oscillation (ENSO) is a major climate mode with variability on a variety of timescales important to society. Climatic extremes such as bushfires, flooding and drought across the tropical Pacific region result from switches in state of the ENSO system, however remote effects of EN...
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ftunivtasecite:oai:ecite.utas.edu.au:90829 2023-05-15T13:37:23+02:00 Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica Vance, TR van Ommen, TD Curran, MAJ Plummer, CT Moy, AD 2012 http://ecite.utas.edu.au/90829 en eng International Polar Year Vance, TR and van Ommen, TD and Curran, MAJ and Plummer, CT and Moy, AD, Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica, IPY 2012 Program, 22-27 April 2012, Montreal, Canada, pp. 1. (2012) [Conference Extract] http://ecite.utas.edu.au/90829 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Conference Extract NonPeerReviewed 2012 ftunivtasecite 2019-12-13T21:54:06Z The El Nio-Southern Oscillation (ENSO) is a major climate mode with variability on a variety of timescales important to society. Climatic extremes such as bushfires, flooding and drought across the tropical Pacific region result from switches in state of the ENSO system, however remote effects of ENSO influence climate in areas outside the tropical Pacific Basin. Evidence that ENSO affects climate at high southern latitudes and Antarctica are comparatively scarce, however this is at least partially due to the paucity of instrumental records from Antarctica and the Southern Ocean. Here we report a link between ENSO and summer sea salt concentrations in a high resolution coastal ice core from Law Dome, East Antarctica. The relationship occurs via an atmospheric teleconnection between ENSO-forced sea surface temperature (SST) and sea level pressure (SLP) anomalies in the Central-Western Equatorial Pacific (CWEP) and atmospheric anomalies in the South Pacific sector of the Southern Ocean during austral winter. During the winter/spring preceding El Nio (La Nia) conditions, an atmospheric Rossby wave train weakens (strengthens) a quasi-stationary low pressure system in the Amundsen and Bellingshausen Seas. As summer approaches this develops into a polar ridge-like (trough-like) anomaly stretching across much of the Antarctic continent and coastal regions that manifests as a weakening (strengthening) of summertime polar westerlies and results in decreased (increased) sea salt concentrations in summer precipitation at LD. The Law Dome ice core record has continuous subseasonal resolution to 1 kya and spectral analysis of this record shows broadly persistent ENSO band features (4-7 years) throughout the last millennium. Conference Object Antarc* Antarctic Antarctica East Antarctica ice core Southern Ocean eCite UTAS (University of Tasmania) Antarctic Austral East Antarctica Kya ENVELOPE(8.308,8.308,63.772,63.772) Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Pacific Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Vance, TR van Ommen, TD Curran, MAJ Plummer, CT Moy, AD Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
The El Nio-Southern Oscillation (ENSO) is a major climate mode with variability on a variety of timescales important to society. Climatic extremes such as bushfires, flooding and drought across the tropical Pacific region result from switches in state of the ENSO system, however remote effects of ENSO influence climate in areas outside the tropical Pacific Basin. Evidence that ENSO affects climate at high southern latitudes and Antarctica are comparatively scarce, however this is at least partially due to the paucity of instrumental records from Antarctica and the Southern Ocean. Here we report a link between ENSO and summer sea salt concentrations in a high resolution coastal ice core from Law Dome, East Antarctica. The relationship occurs via an atmospheric teleconnection between ENSO-forced sea surface temperature (SST) and sea level pressure (SLP) anomalies in the Central-Western Equatorial Pacific (CWEP) and atmospheric anomalies in the South Pacific sector of the Southern Ocean during austral winter. During the winter/spring preceding El Nio (La Nia) conditions, an atmospheric Rossby wave train weakens (strengthens) a quasi-stationary low pressure system in the Amundsen and Bellingshausen Seas. As summer approaches this develops into a polar ridge-like (trough-like) anomaly stretching across much of the Antarctic continent and coastal regions that manifests as a weakening (strengthening) of summertime polar westerlies and results in decreased (increased) sea salt concentrations in summer precipitation at LD. The Law Dome ice core record has continuous subseasonal resolution to 1 kya and spectral analysis of this record shows broadly persistent ENSO band features (4-7 years) throughout the last millennium. |
format |
Conference Object |
author |
Vance, TR van Ommen, TD Curran, MAJ Plummer, CT Moy, AD |
author_facet |
Vance, TR van Ommen, TD Curran, MAJ Plummer, CT Moy, AD |
author_sort |
Vance, TR |
title |
Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica |
title_short |
Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica |
title_full |
Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica |
title_fullStr |
Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica |
title_full_unstemmed |
Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica |
title_sort |
proxy records of el niño-southern oscillation and east australian rainfall from the law dome ice core, east antarctica |
publisher |
International Polar Year |
publishDate |
2012 |
url |
http://ecite.utas.edu.au/90829 |
long_lat |
ENVELOPE(8.308,8.308,63.772,63.772) ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
Antarctic Austral East Antarctica Kya Law Dome Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral East Antarctica Kya Law Dome Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Southern Ocean |
op_relation |
Vance, TR and van Ommen, TD and Curran, MAJ and Plummer, CT and Moy, AD, Proxy Records of El Niño-Southern Oscillation and East Australian Rainfall from the Law Dome Ice Core, East Antarctica, IPY 2012 Program, 22-27 April 2012, Montreal, Canada, pp. 1. (2012) [Conference Extract] http://ecite.utas.edu.au/90829 |
_version_ |
1766091204711153664 |