Tropical and mid-latitude forcing of continental Antarctic temperatures
Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue more acute than across the mid-latitudes to high latitudes of the Southern Hemisphere (SH), which over the last few decades have experienced e...
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European Geosciences Union (EGU)
2015
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_37234 2024-05-12T07:54:49+00:00 Tropical and mid-latitude forcing of continental Antarctic temperatures Turney, CSM Fogwill, CJ Klekociuk, AR van Ommen, TD Curran, MAJ Moy, AD Palmer, JG 2015-12-21 http://hdl.handle.net/1959.4/unsworks_37234 https://doi.org/10.5194/tc-9-2405-2015 unknown European Geosciences Union (EGU) http://purl.org/au-research/grants/arc/DP130104156 http://purl.org/au-research/grants/arc/FL100100195 http://purl.org/au-research/grants/arc/LP120200724 http://hdl.handle.net/1959.4/unsworks_37234 https://doi.org/10.5194/tc-9-2405-2015 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ urn:ISSN:1994-0424 The Cryosphere, 9, 6, 2405-2415 13 Climate Action 14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0406 Physical Geography and Environmental Geoscience journal article http://purl.org/coar/resource_type/c_6501 2015 ftunswworks https://doi.org/10.5194/tc-9-2405-2015 2024-04-17T15:51:41Z Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue more acute than across the mid-latitudes to high latitudes of the Southern Hemisphere (SH), which over the last few decades have experienced extreme and regionally variable trends in precipitation, ocean circulation and temperature, with major implications for Antarctic ice melt and surface mass balance. Unfortunately there is a relative dearth of observational data, limiting our understanding of the driving mechanism(s). Here we report a new 130-year annually resolved record of δD – a proxy for temperature – from the geographic South Pole where we find a significant influence from extratropical pressure anomalies which act as “gatekeepers” to the meridional exchange of air masses. Reanalysis of global atmospheric circulation suggests these pressure anomalies play a significant influence on mid- to high-latitude SH climate, modulated by the tropical Pacific Ocean. This work adds to a growing body of literature confirming the important roles of tropical and mid-latitude atmospheric circulation variability on Antarctic temperatures. Our findings suggest that future increasing tropical warmth will strengthen meridional circulation, exaggerating current trends, with potentially significant impacts on Antarctic surface mass balance. Article in Journal/Newspaper Antarc* Antarctic South pole South pole The Cryosphere UNSW Sydney (The University of New South Wales): UNSWorks Antarctic Pacific South Pole The Cryosphere 9 6 2405 2415 |
institution |
Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
13 Climate Action 14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0406 Physical Geography and Environmental Geoscience |
spellingShingle |
13 Climate Action 14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0406 Physical Geography and Environmental Geoscience Turney, CSM Fogwill, CJ Klekociuk, AR van Ommen, TD Curran, MAJ Moy, AD Palmer, JG Tropical and mid-latitude forcing of continental Antarctic temperatures |
topic_facet |
13 Climate Action 14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0406 Physical Geography and Environmental Geoscience |
description |
Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue more acute than across the mid-latitudes to high latitudes of the Southern Hemisphere (SH), which over the last few decades have experienced extreme and regionally variable trends in precipitation, ocean circulation and temperature, with major implications for Antarctic ice melt and surface mass balance. Unfortunately there is a relative dearth of observational data, limiting our understanding of the driving mechanism(s). Here we report a new 130-year annually resolved record of δD – a proxy for temperature – from the geographic South Pole where we find a significant influence from extratropical pressure anomalies which act as “gatekeepers” to the meridional exchange of air masses. Reanalysis of global atmospheric circulation suggests these pressure anomalies play a significant influence on mid- to high-latitude SH climate, modulated by the tropical Pacific Ocean. This work adds to a growing body of literature confirming the important roles of tropical and mid-latitude atmospheric circulation variability on Antarctic temperatures. Our findings suggest that future increasing tropical warmth will strengthen meridional circulation, exaggerating current trends, with potentially significant impacts on Antarctic surface mass balance. |
format |
Article in Journal/Newspaper |
author |
Turney, CSM Fogwill, CJ Klekociuk, AR van Ommen, TD Curran, MAJ Moy, AD Palmer, JG |
author_facet |
Turney, CSM Fogwill, CJ Klekociuk, AR van Ommen, TD Curran, MAJ Moy, AD Palmer, JG |
author_sort |
Turney, CSM |
title |
Tropical and mid-latitude forcing of continental Antarctic temperatures |
title_short |
Tropical and mid-latitude forcing of continental Antarctic temperatures |
title_full |
Tropical and mid-latitude forcing of continental Antarctic temperatures |
title_fullStr |
Tropical and mid-latitude forcing of continental Antarctic temperatures |
title_full_unstemmed |
Tropical and mid-latitude forcing of continental Antarctic temperatures |
title_sort |
tropical and mid-latitude forcing of continental antarctic temperatures |
publisher |
European Geosciences Union (EGU) |
publishDate |
2015 |
url |
http://hdl.handle.net/1959.4/unsworks_37234 https://doi.org/10.5194/tc-9-2405-2015 |
geographic |
Antarctic Pacific South Pole |
geographic_facet |
Antarctic Pacific South Pole |
genre |
Antarc* Antarctic South pole South pole The Cryosphere |
genre_facet |
Antarc* Antarctic South pole South pole The Cryosphere |
op_source |
urn:ISSN:1994-0424 The Cryosphere, 9, 6, 2405-2415 |
op_relation |
http://purl.org/au-research/grants/arc/DP130104156 http://purl.org/au-research/grants/arc/FL100100195 http://purl.org/au-research/grants/arc/LP120200724 http://hdl.handle.net/1959.4/unsworks_37234 https://doi.org/10.5194/tc-9-2405-2015 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.5194/tc-9-2405-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
6 |
container_start_page |
2405 |
op_container_end_page |
2415 |
_version_ |
1798852439115300864 |