Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends
The austral spring relationships between sea surface temperature (SST) trends and the Southern Hemisphere (SH) extratropical atmospheric circulation are investigated using an atmospheric general circulation model (AGCM). A suite of simulations are analyzed wherein the AGCM is forced by underlying SS...
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American Meteorological Society
2014
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Online Access: | http://hdl.handle.net/1959.4/unsworks_13557 https://doi.org/10.1175/jcli-d-13-00615.1 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_13557 2024-05-19T07:30:58+00:00 Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends Simpkins, GR McGregor, S Taschetto, AS Ciasto, LM England, MH 2014-01-01 http://hdl.handle.net/1959.4/unsworks_13557 https://doi.org/10.1175/jcli-d-13-00615.1 unknown American Meteorological Society http://purl.org/au-research/grants/arc/CE110001028 http://purl.org/au-research/grants/arc/FL100100214 http://hdl.handle.net/1959.4/unsworks_13557 https://doi.org/10.1175/jcli-d-13-00615.1 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:0894-8755 urn:ISSN:1520-0442 Journal of Climate, 27, 13, 4923-4936 13 Climate Action anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering journal article http://purl.org/coar/resource_type/c_6501 2014 ftunswworks https://doi.org/10.1175/jcli-d-13-00615.1 2024-05-01T00:15:17Z The austral spring relationships between sea surface temperature (SST) trends and the Southern Hemisphere (SH) extratropical atmospheric circulation are investigated using an atmospheric general circulation model (AGCM). A suite of simulations are analyzed wherein the AGCM is forced by underlying SST conditions in which recent trends are constrained to individual ocean basins (Pacific, Indian, and Atlantic), allowing the impact of each region to be assessed in isolation. When forced with observed global SST, the model broadly replicates the spatial pattern of extratropical SHgeopotential height trends seen in reanalyses. However, when forcing by each ocean basin separately, similar structures arise only when Atlantic SST trends are included. It is further shown that teleconnections from the Atlantic are associated with perturbations to the zonal Walker circulation and the corresponding intensification of the local Hadley cell, the impact of which results in the development of atmospheric Rossby waves. Thus, increased Rossby waves, forced by positive Atlantic SST trends, may have played a role in driving geopotential height trends in the SH extratropics. Furthermore, these atmospheric circulation changes promote warming throughout the Antarctic Peninsula and much of West Antarctica, with a pattern that closely matches recent observational records. This suggests that Atlantic SST trends, via a teleconnection to the SH extratropics, may have contributed to springtime climatic change in the SH extratropics over the past three decades. © 2014 American Meteorological Society. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica UNSW Sydney (The University of New South Wales): UNSWorks Journal of Climate 27 13 4923 4936 |
institution |
Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
13 Climate Action anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering |
spellingShingle |
13 Climate Action anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering Simpkins, GR McGregor, S Taschetto, AS Ciasto, LM England, MH Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends |
topic_facet |
13 Climate Action anzsrc-for: 0401 Atmospheric Sciences anzsrc-for: 0405 Oceanography anzsrc-for: 0909 Geomatic Engineering |
description |
The austral spring relationships between sea surface temperature (SST) trends and the Southern Hemisphere (SH) extratropical atmospheric circulation are investigated using an atmospheric general circulation model (AGCM). A suite of simulations are analyzed wherein the AGCM is forced by underlying SST conditions in which recent trends are constrained to individual ocean basins (Pacific, Indian, and Atlantic), allowing the impact of each region to be assessed in isolation. When forced with observed global SST, the model broadly replicates the spatial pattern of extratropical SHgeopotential height trends seen in reanalyses. However, when forcing by each ocean basin separately, similar structures arise only when Atlantic SST trends are included. It is further shown that teleconnections from the Atlantic are associated with perturbations to the zonal Walker circulation and the corresponding intensification of the local Hadley cell, the impact of which results in the development of atmospheric Rossby waves. Thus, increased Rossby waves, forced by positive Atlantic SST trends, may have played a role in driving geopotential height trends in the SH extratropics. Furthermore, these atmospheric circulation changes promote warming throughout the Antarctic Peninsula and much of West Antarctica, with a pattern that closely matches recent observational records. This suggests that Atlantic SST trends, via a teleconnection to the SH extratropics, may have contributed to springtime climatic change in the SH extratropics over the past three decades. © 2014 American Meteorological Society. |
format |
Article in Journal/Newspaper |
author |
Simpkins, GR McGregor, S Taschetto, AS Ciasto, LM England, MH |
author_facet |
Simpkins, GR McGregor, S Taschetto, AS Ciasto, LM England, MH |
author_sort |
Simpkins, GR |
title |
Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends |
title_short |
Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends |
title_full |
Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends |
title_fullStr |
Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends |
title_full_unstemmed |
Tropical connections to climatic change in the extratropical Southern Hemisphere: The role of atlantic SST trends |
title_sort |
tropical connections to climatic change in the extratropical southern hemisphere: the role of atlantic sst trends |
publisher |
American Meteorological Society |
publishDate |
2014 |
url |
http://hdl.handle.net/1959.4/unsworks_13557 https://doi.org/10.1175/jcli-d-13-00615.1 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica West Antarctica |
op_source |
urn:ISSN:0894-8755 urn:ISSN:1520-0442 Journal of Climate, 27, 13, 4923-4936 |
op_relation |
http://purl.org/au-research/grants/arc/CE110001028 http://purl.org/au-research/grants/arc/FL100100214 http://hdl.handle.net/1959.4/unsworks_13557 https://doi.org/10.1175/jcli-d-13-00615.1 |
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/10.1175/jcli-d-13-00615.1 |
container_title |
Journal of Climate |
container_volume |
27 |
container_issue |
13 |
container_start_page |
4923 |
op_container_end_page |
4936 |
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1799468810538844160 |