Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration
Abstract The sensitivity of climatological cyclone behaviour in the southern hemisphere to reductions in winter antarctic sea‐ice concentration is studies in general‐circulation‐model (GMC) experiments. An increase in the number of cyclones over most of the Weddell an Ross Seas is a response common...
Published in: | Quarterly Journal of the Royal Meteorological Society |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1993
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/qj.49711951313 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.49711951313 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.49711951313 |
id |
crwiley:10.1002/qj.49711951313 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/qj.49711951313 2024-06-23T07:46:53+00:00 Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration Simmonds, Ian Wu, Xingren 1993 http://dx.doi.org/10.1002/qj.49711951313 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.49711951313 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.49711951313 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 119, issue 513, page 1121-1148 ISSN 0035-9009 1477-870X journal-article 1993 crwiley https://doi.org/10.1002/qj.49711951313 2024-05-31T08:15:49Z Abstract The sensitivity of climatological cyclone behaviour in the southern hemisphere to reductions in winter antarctic sea‐ice concentration is studies in general‐circulation‐model (GMC) experiments. An increase in the number of cyclones over most of the Weddell an Ross Seas is a response common to all cases of reduction of sea‐ice concentration from 100%. There is a tendency, particularly at lower ice concentrations, for more cyclones to be found in the latitude band of about 10 to 15° of latitude width centered on the antarctic coast, and a belt of fewer cyclones to the north. The structure of the changes in cyclogenesis assumes a much lesser zonally oriented form, and all experiments induce enhanced cyclogenesis in the western Weddell Sea. For the most part thee is an increase in cyclogenesis south of about 65°S, although some longitudinal sectors show up as regions of decreased cyclogenesis even through the sea‐ice concentration has been reduced there. The intensity of the extratropical cyclones has been quantified as the difference between the Mean depth of the systems and the climatological average pressure for each particular sea‐ice configuration. Perhaps contrary to what might have been expected, this ‘relative’ central pressure of lows exhibits an increase over most of the sea‐ice area (i.e. the cyclones become weaker in a relative sense). In an earlier study it was found that the climatological response to imposed anomalies of sea‐ice concentration was that the lowering of the concentration of antarctic sea ice resulted in a lowering of sea‐level pressure, particularly close to the continent. The results presented here strongly suggest that the climatological decreases in pressure result essentially from increases in cyclone numbers as opposed to the possibility that the cyclones are more intense. We have attempted to relate the regions of cyclogenesis with a measure of baroclinicity in the control simulation. We have also examined the relationship between changes in these parameters in response to ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Weddell Sea Wiley Online Library Antarctic The Antarctic Weddell Weddell Sea Quarterly Journal of the Royal Meteorological Society 119 513 1121 1148 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The sensitivity of climatological cyclone behaviour in the southern hemisphere to reductions in winter antarctic sea‐ice concentration is studies in general‐circulation‐model (GMC) experiments. An increase in the number of cyclones over most of the Weddell an Ross Seas is a response common to all cases of reduction of sea‐ice concentration from 100%. There is a tendency, particularly at lower ice concentrations, for more cyclones to be found in the latitude band of about 10 to 15° of latitude width centered on the antarctic coast, and a belt of fewer cyclones to the north. The structure of the changes in cyclogenesis assumes a much lesser zonally oriented form, and all experiments induce enhanced cyclogenesis in the western Weddell Sea. For the most part thee is an increase in cyclogenesis south of about 65°S, although some longitudinal sectors show up as regions of decreased cyclogenesis even through the sea‐ice concentration has been reduced there. The intensity of the extratropical cyclones has been quantified as the difference between the Mean depth of the systems and the climatological average pressure for each particular sea‐ice configuration. Perhaps contrary to what might have been expected, this ‘relative’ central pressure of lows exhibits an increase over most of the sea‐ice area (i.e. the cyclones become weaker in a relative sense). In an earlier study it was found that the climatological response to imposed anomalies of sea‐ice concentration was that the lowering of the concentration of antarctic sea ice resulted in a lowering of sea‐level pressure, particularly close to the continent. The results presented here strongly suggest that the climatological decreases in pressure result essentially from increases in cyclone numbers as opposed to the possibility that the cyclones are more intense. We have attempted to relate the regions of cyclogenesis with a measure of baroclinicity in the control simulation. We have also examined the relationship between changes in these parameters in response to ... |
format |
Article in Journal/Newspaper |
author |
Simmonds, Ian Wu, Xingren |
spellingShingle |
Simmonds, Ian Wu, Xingren Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
author_facet |
Simmonds, Ian Wu, Xingren |
author_sort |
Simmonds, Ian |
title |
Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
title_short |
Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
title_full |
Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
title_fullStr |
Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
title_full_unstemmed |
Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
title_sort |
cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.1002/qj.49711951313 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.49711951313 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.49711951313 |
geographic |
Antarctic The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Weddell Sea |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 119, issue 513, page 1121-1148 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.49711951313 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
119 |
container_issue |
513 |
container_start_page |
1121 |
op_container_end_page |
1148 |
_version_ |
1802649025388740608 |