Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean
Abstract Changes in the intensity and position of subtropical anticyclones are major drivers of wave climate around Australia. The quasi‐stationary ridge of high atmospheric pressure in the mid‐latitudes is known as the Subtropical Ridge (STR). In this study, we decompose the directional wave climat...
Published in: | International Journal of Climatology |
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crwiley:10.1002/joc.6522 2024-06-02T08:14:48+00:00 Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean Mortlock, Thomas R. Baillie, Zak Goodwin, Ian D. Browning, Stuart 2020 http://dx.doi.org/10.1002/joc.6522 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6522 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6522 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6522 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6522 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 40, issue 12, page 5352-5367 ISSN 0899-8418 1097-0088 journal-article 2020 crwiley https://doi.org/10.1002/joc.6522 2024-05-03T10:57:14Z Abstract Changes in the intensity and position of subtropical anticyclones are major drivers of wave climate around Australia. The quasi‐stationary ridge of high atmospheric pressure in the mid‐latitudes is known as the Subtropical Ridge (STR). In this study, we decompose the directional wave climate along the Western Australian Shelf (WAS) into three primary modes of variability using a statistical‐synoptic typing approach, and relate the wave power signatures of each to movements in the STR. We find a significant reduction in wave power along the WAS over the past 35 years. This is synonymous with an intensification of the STR resulting in blocking of powerful Southern Ocean Low wave conditions, a small increase in weaker anticyclonic waves, and a reduction in total wave power. A persistent intensification and/or poleward shift in the STR, associated with anthropogenic warming, may result in a continued decrease and anticlockwise rotation in wave power along the WAS. The approach taken in this article relates empirical changes in wave climate to movements in large‐scale climate drivers which can be used to complement the understanding of climate‐model based scenarios of wave climate change. Article in Journal/Newspaper Southern Ocean Wiley Online Library Indian Southern Ocean International Journal of Climatology 40 12 5352 5367 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Changes in the intensity and position of subtropical anticyclones are major drivers of wave climate around Australia. The quasi‐stationary ridge of high atmospheric pressure in the mid‐latitudes is known as the Subtropical Ridge (STR). In this study, we decompose the directional wave climate along the Western Australian Shelf (WAS) into three primary modes of variability using a statistical‐synoptic typing approach, and relate the wave power signatures of each to movements in the STR. We find a significant reduction in wave power along the WAS over the past 35 years. This is synonymous with an intensification of the STR resulting in blocking of powerful Southern Ocean Low wave conditions, a small increase in weaker anticyclonic waves, and a reduction in total wave power. A persistent intensification and/or poleward shift in the STR, associated with anthropogenic warming, may result in a continued decrease and anticlockwise rotation in wave power along the WAS. The approach taken in this article relates empirical changes in wave climate to movements in large‐scale climate drivers which can be used to complement the understanding of climate‐model based scenarios of wave climate change. |
format |
Article in Journal/Newspaper |
author |
Mortlock, Thomas R. Baillie, Zak Goodwin, Ian D. Browning, Stuart |
spellingShingle |
Mortlock, Thomas R. Baillie, Zak Goodwin, Ian D. Browning, Stuart Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
author_facet |
Mortlock, Thomas R. Baillie, Zak Goodwin, Ian D. Browning, Stuart |
author_sort |
Mortlock, Thomas R. |
title |
Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
title_short |
Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
title_full |
Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
title_fullStr |
Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
title_full_unstemmed |
Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
title_sort |
influence of the subtropical ridge on directional wave power in the southeast indian ocean |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/joc.6522 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.6522 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6522 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6522 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6522 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
International Journal of Climatology volume 40, issue 12, page 5352-5367 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.6522 |
container_title |
International Journal of Climatology |
container_volume |
40 |
container_issue |
12 |
container_start_page |
5352 |
op_container_end_page |
5367 |
_version_ |
1800738772878360576 |