Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures
The Southern Hemisphere reveals markedly different circulation patterns associated with extreme warm and cold Antarctic Peninsula (AP) winter temperatures. Warm winters are associated with negative 500 hPa height anomalies in the Amundsen Sea-Bellingshausen Sea (AS-BS) and positive anomalies in the...
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American Geophysical Union
1998
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Online Access: | http://nora.nerc.ac.uk/id/eprint/504184/ https://doi.org/10.1029/98GL01651 |
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ftnerc:oai:nora.nerc.ac.uk:504184 2023-05-15T13:24:05+02:00 Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures Marshall, Gareth J. King, John C. 1998 http://nora.nerc.ac.uk/id/eprint/504184/ https://doi.org/10.1029/98GL01651 unknown American Geophysical Union Marshall, Gareth J. orcid:0000-0001-8887-7314 King, John C. orcid:0000-0003-3315-7568 . 1998 Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures. Geophysical Research Letters, 25 (13). 2437-2440. https://doi.org/10.1029/98GL01651 <https://doi.org/10.1029/98GL01651> Publication - Article PeerReviewed 1998 ftnerc https://doi.org/10.1029/98GL01651 2023-02-04T19:38:19Z The Southern Hemisphere reveals markedly different circulation patterns associated with extreme warm and cold Antarctic Peninsula (AP) winter temperatures. Warm winters are associated with negative 500 hPa height anomalies in the Amundsen Sea-Bellingshausen Sea (AS-BS) and positive anomalies in the South Pacific (SP) and Scotia Sea with opposing anomalies existent in cold winters. Furthermore, a switch in the relative strength of the two arms of the New Zealand split jet, the subtropical jet (STJ) and polar front jet (PFJ), occurs with the PFJ (STJ) strengthened and the STJ (PFJ) weakened in warm (cold) years leading to increased cyclonic activity in the AS-BS (SP) and a corresponding decrease in the SP (AS-BS). These hemispheric anomaly patterns bear a strong resemblance to those associated with El Niño-Southern Oscillation (ENSO) events, and their origins can be ascribed to tropical sea surface temperatures (SST) changes. However, the correspondence between warm (cold) ENSO events and cold (warm) winters is not perfect. Potential contributors to this non-linearity include intraseasonal tropical SST variations (not necessarily represented in the usual filtered ENSO indices) and the persistence of local sea ice anomalies west of the Peninsula. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Scotia Sea Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Scotia Sea Amundsen Sea Bellingshausen Sea Pacific New Zealand Geophysical Research Letters 25 13 2437 2440 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
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unknown |
description |
The Southern Hemisphere reveals markedly different circulation patterns associated with extreme warm and cold Antarctic Peninsula (AP) winter temperatures. Warm winters are associated with negative 500 hPa height anomalies in the Amundsen Sea-Bellingshausen Sea (AS-BS) and positive anomalies in the South Pacific (SP) and Scotia Sea with opposing anomalies existent in cold winters. Furthermore, a switch in the relative strength of the two arms of the New Zealand split jet, the subtropical jet (STJ) and polar front jet (PFJ), occurs with the PFJ (STJ) strengthened and the STJ (PFJ) weakened in warm (cold) years leading to increased cyclonic activity in the AS-BS (SP) and a corresponding decrease in the SP (AS-BS). These hemispheric anomaly patterns bear a strong resemblance to those associated with El Niño-Southern Oscillation (ENSO) events, and their origins can be ascribed to tropical sea surface temperatures (SST) changes. However, the correspondence between warm (cold) ENSO events and cold (warm) winters is not perfect. Potential contributors to this non-linearity include intraseasonal tropical SST variations (not necessarily represented in the usual filtered ENSO indices) and the persistence of local sea ice anomalies west of the Peninsula. |
format |
Article in Journal/Newspaper |
author |
Marshall, Gareth J. King, John C. |
spellingShingle |
Marshall, Gareth J. King, John C. Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures |
author_facet |
Marshall, Gareth J. King, John C. |
author_sort |
Marshall, Gareth J. |
title |
Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures |
title_short |
Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures |
title_full |
Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures |
title_fullStr |
Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures |
title_full_unstemmed |
Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures |
title_sort |
southern hemisphere circulation anomalies associated with extreme antarctic peninsula winter temperatures |
publisher |
American Geophysical Union |
publishDate |
1998 |
url |
http://nora.nerc.ac.uk/id/eprint/504184/ https://doi.org/10.1029/98GL01651 |
geographic |
Antarctic Antarctic Peninsula Scotia Sea Amundsen Sea Bellingshausen Sea Pacific New Zealand |
geographic_facet |
Antarctic Antarctic Peninsula Scotia Sea Amundsen Sea Bellingshausen Sea Pacific New Zealand |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Scotia Sea Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Scotia Sea Sea ice |
op_relation |
Marshall, Gareth J. orcid:0000-0001-8887-7314 King, John C. orcid:0000-0003-3315-7568 . 1998 Southern hemisphere circulation anomalies associated with extreme Antarctic peninsula winter temperatures. Geophysical Research Letters, 25 (13). 2437-2440. https://doi.org/10.1029/98GL01651 <https://doi.org/10.1029/98GL01651> |
op_doi |
https://doi.org/10.1029/98GL01651 |
container_title |
Geophysical Research Letters |
container_volume |
25 |
container_issue |
13 |
container_start_page |
2437 |
op_container_end_page |
2440 |
_version_ |
1766377320028831744 |