The Amundsen Sea low
We develop a climatology of the Amundsen Sea low (ASL) covering the period 1979–2008 using ECMWF operational and reanalysis fields. The depth of the ASL is strongly influenced by the phase of the Southern annular mode (SAM) with positive (negative) mean sea level pressure anomalies when the SAM is n...
Published in: | International Journal of Climatology |
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ftnerc:oai:nora.nerc.ac.uk:502639 2023-05-15T13:23:53+02:00 The Amundsen Sea low Turner, John Phillips, Tony Hosking, J. Scott Marshall, Gareth J. Orr, Andrew 2013-06-15 text http://nora.nerc.ac.uk/id/eprint/502639/ https://nora.nerc.ac.uk/id/eprint/502639/1/The%20Amundsen%20Sea%20Low%20REVISED.pdf https://doi.org/10.1002/joc.3558 en eng Wiley https://nora.nerc.ac.uk/id/eprint/502639/1/The%20Amundsen%20Sea%20Low%20REVISED.pdf Turner, John orcid:0000-0002-6111-5122 Phillips, Tony orcid:0000-0002-3058-9157 Hosking, J. Scott orcid:0000-0002-3646-3504 Marshall, Gareth J. orcid:0000-0001-8887-7314 Orr, Andrew orcid:0000-0001-5111-8402 . 2013 The Amundsen Sea low. International Journal of Climatology, 33 (7). 1818-1829. https://doi.org/10.1002/joc.3558 <https://doi.org/10.1002/joc.3558> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/joc.3558 2023-02-04T19:37:25Z We develop a climatology of the Amundsen Sea low (ASL) covering the period 1979–2008 using ECMWF operational and reanalysis fields. The depth of the ASL is strongly influenced by the phase of the Southern annular mode (SAM) with positive (negative) mean sea level pressure anomalies when the SAM is negative (positive). The zonal location of the ASL is linked to the phase of the mid-tropospheric planetary waves and the low moves west from close to 110°W in January to near 150°W in June as planetary waves 1 to 3 amplify and their phases shift westwards. The ASL is deeper by a small, but significant amount, during the La Niña phase of El Niño-Southern Oscillation (ENSO) compared to El Niño. The difference in depth of the low between the two states of ENSO is greatest in winter. There is no statistically significant difference in the zonal location of the ASL between the different phases of ENSO. Over 1979–2008 the low has deepened in January by 1.7 hPa dec−1 as the SAM has become more positive. It has also deepened in spring and autumn as the semi-annual oscillation has increase in amplitude over the last 30 years. An increase in central pressure and eastward shift in March has occurred as a result of a cooling of tropical Pacific SSTs that altered the strength of the polar front jet. Article in Journal/Newspaper Amundsen Sea Natural Environment Research Council: NERC Open Research Archive Amundsen Sea Pacific International Journal of Climatology 33 7 1818 1829 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
We develop a climatology of the Amundsen Sea low (ASL) covering the period 1979–2008 using ECMWF operational and reanalysis fields. The depth of the ASL is strongly influenced by the phase of the Southern annular mode (SAM) with positive (negative) mean sea level pressure anomalies when the SAM is negative (positive). The zonal location of the ASL is linked to the phase of the mid-tropospheric planetary waves and the low moves west from close to 110°W in January to near 150°W in June as planetary waves 1 to 3 amplify and their phases shift westwards. The ASL is deeper by a small, but significant amount, during the La Niña phase of El Niño-Southern Oscillation (ENSO) compared to El Niño. The difference in depth of the low between the two states of ENSO is greatest in winter. There is no statistically significant difference in the zonal location of the ASL between the different phases of ENSO. Over 1979–2008 the low has deepened in January by 1.7 hPa dec−1 as the SAM has become more positive. It has also deepened in spring and autumn as the semi-annual oscillation has increase in amplitude over the last 30 years. An increase in central pressure and eastward shift in March has occurred as a result of a cooling of tropical Pacific SSTs that altered the strength of the polar front jet. |
format |
Article in Journal/Newspaper |
author |
Turner, John Phillips, Tony Hosking, J. Scott Marshall, Gareth J. Orr, Andrew |
spellingShingle |
Turner, John Phillips, Tony Hosking, J. Scott Marshall, Gareth J. Orr, Andrew The Amundsen Sea low |
author_facet |
Turner, John Phillips, Tony Hosking, J. Scott Marshall, Gareth J. Orr, Andrew |
author_sort |
Turner, John |
title |
The Amundsen Sea low |
title_short |
The Amundsen Sea low |
title_full |
The Amundsen Sea low |
title_fullStr |
The Amundsen Sea low |
title_full_unstemmed |
The Amundsen Sea low |
title_sort |
amundsen sea low |
publisher |
Wiley |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/502639/ https://nora.nerc.ac.uk/id/eprint/502639/1/The%20Amundsen%20Sea%20Low%20REVISED.pdf https://doi.org/10.1002/joc.3558 |
geographic |
Amundsen Sea Pacific |
geographic_facet |
Amundsen Sea Pacific |
genre |
Amundsen Sea |
genre_facet |
Amundsen Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/502639/1/The%20Amundsen%20Sea%20Low%20REVISED.pdf Turner, John orcid:0000-0002-6111-5122 Phillips, Tony orcid:0000-0002-3058-9157 Hosking, J. Scott orcid:0000-0002-3646-3504 Marshall, Gareth J. orcid:0000-0001-8887-7314 Orr, Andrew orcid:0000-0001-5111-8402 . 2013 The Amundsen Sea low. International Journal of Climatology, 33 (7). 1818-1829. https://doi.org/10.1002/joc.3558 <https://doi.org/10.1002/joc.3558> |
op_doi |
https://doi.org/10.1002/joc.3558 |
container_title |
International Journal of Climatology |
container_volume |
33 |
container_issue |
7 |
container_start_page |
1818 |
op_container_end_page |
1829 |
_version_ |
1766376085210005504 |