A new perspective on Southern hemisphere storm-tracks.
A detailed view of Southern Hemisphere storm tracks is obtained based on the application of filtered variance and modern feature-tracking techniques to a wide range of 45-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40) data. It has been checked that the conclusions...
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2005
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ftunivreading:oai:centaur.reading.ac.uk:56 2024-06-23T07:47:41+00:00 A new perspective on Southern hemisphere storm-tracks. Hoskins, Brian John Hodges, Kevin Ivan 2005-10 https://centaur.reading.ac.uk/56/ unknown American Meteorological Society Hoskins, B. J. <https://centaur.reading.ac.uk/view/creators/90000043.html> and Hodges, K. I. <https://centaur.reading.ac.uk/view/creators/90000463.html> (2005) A new perspective on Southern hemisphere storm-tracks. Journal of Climate, 18 (20). pp. 4108-4129. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI3570.1 <https://doi.org/10.1175/JCLI3570.1> 551 Geology hydrology meteorology Article PeerReviewed 2005 ftunivreading https://doi.org/10.1175/JCLI3570.1 2024-06-11T14:41:45Z A detailed view of Southern Hemisphere storm tracks is obtained based on the application of filtered variance and modern feature-tracking techniques to a wide range of 45-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40) data. It has been checked that the conclusions drawn in this study are valid even if data from only the satellite era are used. The emphasis of the paper is on the winter season, but results for the four seasons are also discussed. Both upper- and lower-tropospheric fields are used. The tracking analysis focuses on systems that last longer than 2 days and are mobile (move more than 1000 km). Many of the results support previous ideas about the storm tracks, but some new insights are also obtained. In the summer there is a rather circular, strong, deep high-latitude storm track. In winter the high-latitude storm track is more asymmetric with a spiral from the Atlantic and Indian Oceans in toward Antarctica and a subtropical jet–related lower-latitude storm track over the Pacific, again tending to spiral poleward. At all times of the year, maximum storm activity in the higher-latitude storm track is in the Atlantic and Indian Ocean regions. In the winter upper troposphere, the relative importance of, and interplay between, the subtropical and subpolar storm tracks is discussed. The genesis, lysis, and growth rate of lower-tropospheric winter cyclones together lead to a vivid picture of their behavior that is summarized as a set of overlapping plates, each composed of cyclone life cycles. Systems in each plate appear to feed the genesis in the next plate through downstream development in the upper-troposphere spiral storm track. In the lee of the Andes in South America, there is cyclogenesis associated with the subtropical jet and also, poleward of this, cyclogenesis largely associated with system decay on the upslope and regeneration on the downslope. The genesis and lysis of cyclones and anticyclones have a definite spatial relationship with each other and with ... Article in Journal/Newspaper Antarc* Antarctica CentAUR: Central Archive at the University of Reading Indian Pacific Journal of Climate 18 20 4108 4129 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
unknown |
topic |
551 Geology hydrology meteorology |
spellingShingle |
551 Geology hydrology meteorology Hoskins, Brian John Hodges, Kevin Ivan A new perspective on Southern hemisphere storm-tracks. |
topic_facet |
551 Geology hydrology meteorology |
description |
A detailed view of Southern Hemisphere storm tracks is obtained based on the application of filtered variance and modern feature-tracking techniques to a wide range of 45-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40) data. It has been checked that the conclusions drawn in this study are valid even if data from only the satellite era are used. The emphasis of the paper is on the winter season, but results for the four seasons are also discussed. Both upper- and lower-tropospheric fields are used. The tracking analysis focuses on systems that last longer than 2 days and are mobile (move more than 1000 km). Many of the results support previous ideas about the storm tracks, but some new insights are also obtained. In the summer there is a rather circular, strong, deep high-latitude storm track. In winter the high-latitude storm track is more asymmetric with a spiral from the Atlantic and Indian Oceans in toward Antarctica and a subtropical jet–related lower-latitude storm track over the Pacific, again tending to spiral poleward. At all times of the year, maximum storm activity in the higher-latitude storm track is in the Atlantic and Indian Ocean regions. In the winter upper troposphere, the relative importance of, and interplay between, the subtropical and subpolar storm tracks is discussed. The genesis, lysis, and growth rate of lower-tropospheric winter cyclones together lead to a vivid picture of their behavior that is summarized as a set of overlapping plates, each composed of cyclone life cycles. Systems in each plate appear to feed the genesis in the next plate through downstream development in the upper-troposphere spiral storm track. In the lee of the Andes in South America, there is cyclogenesis associated with the subtropical jet and also, poleward of this, cyclogenesis largely associated with system decay on the upslope and regeneration on the downslope. The genesis and lysis of cyclones and anticyclones have a definite spatial relationship with each other and with ... |
format |
Article in Journal/Newspaper |
author |
Hoskins, Brian John Hodges, Kevin Ivan |
author_facet |
Hoskins, Brian John Hodges, Kevin Ivan |
author_sort |
Hoskins, Brian John |
title |
A new perspective on Southern hemisphere storm-tracks. |
title_short |
A new perspective on Southern hemisphere storm-tracks. |
title_full |
A new perspective on Southern hemisphere storm-tracks. |
title_fullStr |
A new perspective on Southern hemisphere storm-tracks. |
title_full_unstemmed |
A new perspective on Southern hemisphere storm-tracks. |
title_sort |
new perspective on southern hemisphere storm-tracks. |
publisher |
American Meteorological Society |
publishDate |
2005 |
url |
https://centaur.reading.ac.uk/56/ |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Hoskins, B. J. <https://centaur.reading.ac.uk/view/creators/90000043.html> and Hodges, K. I. <https://centaur.reading.ac.uk/view/creators/90000463.html> (2005) A new perspective on Southern hemisphere storm-tracks. Journal of Climate, 18 (20). pp. 4108-4129. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI3570.1 <https://doi.org/10.1175/JCLI3570.1> |
op_doi |
https://doi.org/10.1175/JCLI3570.1 |
container_title |
Journal of Climate |
container_volume |
18 |
container_issue |
20 |
container_start_page |
4108 |
op_container_end_page |
4129 |
_version_ |
1802651835967733760 |