Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment
Abstract Results are presented from the first investigation into a summer‐season of mesoscale vortex activity in a large sector of the Antarctic coastal region. The study is based on an analysis of 3 months' meteorological satellite imagery collected at the British Research Station ‘Rothera’ on...
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crwiley:10.1002/joc.3370140805 2024-09-15T17:46:44+00:00 Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment Turner, John Thomas, Jeremy P. 1994 http://dx.doi.org/10.1002/joc.3370140805 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3370140805 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3370140805 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 14, issue 8, page 871-894 ISSN 0899-8418 1097-0088 journal-article 1994 crwiley https://doi.org/10.1002/joc.3370140805 2024-08-09T04:31:31Z Abstract Results are presented from the first investigation into a summer‐season of mesoscale vortex activity in a large sector of the Antarctic coastal region. The study is based on an analysis of 3 months' meteorological satellite imagery collected at the British Research Station ‘Rothera’ on the Antarctic Peninsula. The study revealed the high frequency with which such systems occur, with 162 individual vortices being found during the period December 1983 to February 1984 inclusive. The preferred area for their development was in the latitude band 60–70°S over the marginal ice zone and ice‐free region of the eastern Bellingshausen Sea. A classification scheme for the vortices was developed based on the relationship with the broad‐scale synoptic flow, the sea ice, and the geographical location. The most common type of vortex found was the ‘classic’ polar low, which formed in the southerly flow to the west of synoptic‐scale disturbances. These vortices were very similar to the baroclinic type of polar lows observed south of Iceland during the Northern Hemisphere winter. A third of the vortices in total were found to be mesoscale features associated with synoptic‐scale troughs or the centres of major depressions. Vortices with comma‐shaped cloud signatures occurred about twice as frequently as those with spiraliform cloud. The vast majority of vortices had a diameter of less than 500 km, with very few systems being observed in the range 500–1000 km. Mean anomalies of 500 hPa geopotential height and surface pressure for the occasions when vortices were identified were —5.3 dm and — 0.5 hPa, respectively, indicating the association of these systems with upper air troughs and cold pools. Only 23 of the vortices found were correctly represented on the Meteorological Office analyses and of these 15 were small synoptic disturbances. The ‘polar low’ class of vortex was very poorly represented in the analyses, indicating that the available satellite sounder data could not resolve the systems and that the processes ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Iceland Sea ice Wiley Online Library International Journal of Climatology 14 8 871 894 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Results are presented from the first investigation into a summer‐season of mesoscale vortex activity in a large sector of the Antarctic coastal region. The study is based on an analysis of 3 months' meteorological satellite imagery collected at the British Research Station ‘Rothera’ on the Antarctic Peninsula. The study revealed the high frequency with which such systems occur, with 162 individual vortices being found during the period December 1983 to February 1984 inclusive. The preferred area for their development was in the latitude band 60–70°S over the marginal ice zone and ice‐free region of the eastern Bellingshausen Sea. A classification scheme for the vortices was developed based on the relationship with the broad‐scale synoptic flow, the sea ice, and the geographical location. The most common type of vortex found was the ‘classic’ polar low, which formed in the southerly flow to the west of synoptic‐scale disturbances. These vortices were very similar to the baroclinic type of polar lows observed south of Iceland during the Northern Hemisphere winter. A third of the vortices in total were found to be mesoscale features associated with synoptic‐scale troughs or the centres of major depressions. Vortices with comma‐shaped cloud signatures occurred about twice as frequently as those with spiraliform cloud. The vast majority of vortices had a diameter of less than 500 km, with very few systems being observed in the range 500–1000 km. Mean anomalies of 500 hPa geopotential height and surface pressure for the occasions when vortices were identified were —5.3 dm and — 0.5 hPa, respectively, indicating the association of these systems with upper air troughs and cold pools. Only 23 of the vortices found were correctly represented on the Meteorological Office analyses and of these 15 were small synoptic disturbances. The ‘polar low’ class of vortex was very poorly represented in the analyses, indicating that the available satellite sounder data could not resolve the systems and that the processes ... |
format |
Article in Journal/Newspaper |
author |
Turner, John Thomas, Jeremy P. |
spellingShingle |
Turner, John Thomas, Jeremy P. Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
author_facet |
Turner, John Thomas, Jeremy P. |
author_sort |
Turner, John |
title |
Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
title_short |
Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
title_full |
Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
title_fullStr |
Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
title_full_unstemmed |
Summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
title_sort |
summer‐season mesoscale cyclones in the bellingshausen‐weddell region of the antarctic and links with the synoptic‐scale environment |
publisher |
Wiley |
publishDate |
1994 |
url |
http://dx.doi.org/10.1002/joc.3370140805 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3370140805 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3370140805 |
genre |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Iceland Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bellingshausen Sea Iceland Sea ice |
op_source |
International Journal of Climatology volume 14, issue 8, page 871-894 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.3370140805 |
container_title |
International Journal of Climatology |
container_volume |
14 |
container_issue |
8 |
container_start_page |
871 |
op_container_end_page |
894 |
_version_ |
1810495080891416576 |