Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean
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 t...
Published in: | International Journal of Climatology |
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Online Access: | https://researchers.mq.edu.au/en/publications/6bd2bba6-6416-4181-85f6-f04ce2e8611f https://doi.org/10.1002/joc.6522 http://www.scopus.com/inward/record.url?scp=85089430164&partnerID=8YFLogxK |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/6bd2bba6-6416-4181-85f6-f04ce2e8611f 2024-04-28T08:39:36+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 2020-10 https://researchers.mq.edu.au/en/publications/6bd2bba6-6416-4181-85f6-f04ce2e8611f https://doi.org/10.1002/joc.6522 http://www.scopus.com/inward/record.url?scp=85089430164&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Mortlock , T R , Baillie , Z , Goodwin , I D & Browning , S 2020 , ' Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean ' , International Journal of Climatology , vol. 40 , no. 12 , pp. 5352-5367 . https://doi.org/10.1002/joc.6522 climate change climate indices Indian Ocean subtropical ridge wave climate wave power western Australia article 2020 ftmacquarieunicr https://doi.org/10.1002/joc.6522 2024-04-09T15:11:40Z 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 Macquarie University Research Portal International Journal of Climatology 40 12 5352 5367 |
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Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
climate change climate indices Indian Ocean subtropical ridge wave climate wave power western Australia |
spellingShingle |
climate change climate indices Indian Ocean subtropical ridge wave climate wave power western Australia Mortlock, Thomas R. Baillie, Zak Goodwin, Ian D. Browning, Stuart Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean |
topic_facet |
climate change climate indices Indian Ocean subtropical ridge wave climate wave power western Australia |
description |
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 |
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 |
publishDate |
2020 |
url |
https://researchers.mq.edu.au/en/publications/6bd2bba6-6416-4181-85f6-f04ce2e8611f https://doi.org/10.1002/joc.6522 http://www.scopus.com/inward/record.url?scp=85089430164&partnerID=8YFLogxK |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Mortlock , T R , Baillie , Z , Goodwin , I D & Browning , S 2020 , ' Influence of the subtropical ridge on directional wave power in the southeast Indian Ocean ' , International Journal of Climatology , vol. 40 , no. 12 , pp. 5352-5367 . https://doi.org/10.1002/joc.6522 |
op_rights |
info:eu-repo/semantics/closedAccess |
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_ |
1797570562753560576 |