Seasonal cycle of the Antarctic coastal ocean
Under the Japanese Antarctic Climate Research (ACR) program, year-round oceanographic observations were conducted in the vicinity of Lutzow-Holm Bay, during 1990-1992. It was found that the thickness of the Winter Water (WW) layer, characterized by a cold fresh oxygen-rich water, exhibits its maximu...
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National Institute of Polar Research
1997
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fttriple:oai:gotriple.eu:oai:doaj.org/article:54074bd8c6e44d27b601f329139a662f 2023-05-15T14:00:08+02:00 Seasonal cycle of the Antarctic coastal ocean Kay I. Ohshima Takatoshi Takizawa Shuki Ushio Toshiyuki Kawamura 1997-03-01 https://doi.org/10.15094/00008978 https://doaj.org/article/54074bd8c6e44d27b601f329139a662f en other eng National Institute of Polar Research doi:10.15094/00008978 0085-7289 2432-079X https://doaj.org/article/54074bd8c6e44d27b601f329139a662f undefined Antarctic Record, Vol 41, Iss 1, Pp 311-328 (1997) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1997 fttriple https://doi.org/10.15094/00008978 2023-01-22T19:35:21Z Under the Japanese Antarctic Climate Research (ACR) program, year-round oceanographic observations were conducted in the vicinity of Lutzow-Holm Bay, during 1990-1992. It was found that the thickness of the Winter Water (WW) layer, characterized by a cold fresh oxygen-rich water, exhibits its maximum in the austral fall (typically 500m) and its minimum in the austral summer (typically 350-400m). The associated density variation of the water column explains only about one third of the seasonal variations in sea level at the coast, which suggests a large seasonal variation in barotropic coastal flow. Prominent freshening occurs in the WW layer during fall. This appears to be caused by the accumulation of WW, whose upper portion is freshened in the preceding summer. We think that this accumulation of the freshened (accordingly less dense) water is a possible reason why bottom water formation can not occur in this area. We propose that the seasonal variation in the WW layer is mainly caused by the seasonal variation in the wind over the coastal ocean. In fall the prevailing easterly wind intensifies, which increases the Ekman convergence of WW in the coastal ocean, while in summer the opposite occurs. Article in Journal/Newspaper Antarc* Antarctic Unknown Antarctic Austral The Antarctic |
institution |
Open Polar |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir Kay I. Ohshima Takatoshi Takizawa Shuki Ushio Toshiyuki Kawamura Seasonal cycle of the Antarctic coastal ocean |
topic_facet |
geo envir |
description |
Under the Japanese Antarctic Climate Research (ACR) program, year-round oceanographic observations were conducted in the vicinity of Lutzow-Holm Bay, during 1990-1992. It was found that the thickness of the Winter Water (WW) layer, characterized by a cold fresh oxygen-rich water, exhibits its maximum in the austral fall (typically 500m) and its minimum in the austral summer (typically 350-400m). The associated density variation of the water column explains only about one third of the seasonal variations in sea level at the coast, which suggests a large seasonal variation in barotropic coastal flow. Prominent freshening occurs in the WW layer during fall. This appears to be caused by the accumulation of WW, whose upper portion is freshened in the preceding summer. We think that this accumulation of the freshened (accordingly less dense) water is a possible reason why bottom water formation can not occur in this area. We propose that the seasonal variation in the WW layer is mainly caused by the seasonal variation in the wind over the coastal ocean. In fall the prevailing easterly wind intensifies, which increases the Ekman convergence of WW in the coastal ocean, while in summer the opposite occurs. |
format |
Article in Journal/Newspaper |
author |
Kay I. Ohshima Takatoshi Takizawa Shuki Ushio Toshiyuki Kawamura |
author_facet |
Kay I. Ohshima Takatoshi Takizawa Shuki Ushio Toshiyuki Kawamura |
author_sort |
Kay I. Ohshima |
title |
Seasonal cycle of the Antarctic coastal ocean |
title_short |
Seasonal cycle of the Antarctic coastal ocean |
title_full |
Seasonal cycle of the Antarctic coastal ocean |
title_fullStr |
Seasonal cycle of the Antarctic coastal ocean |
title_full_unstemmed |
Seasonal cycle of the Antarctic coastal ocean |
title_sort |
seasonal cycle of the antarctic coastal ocean |
publisher |
National Institute of Polar Research |
publishDate |
1997 |
url |
https://doi.org/10.15094/00008978 https://doaj.org/article/54074bd8c6e44d27b601f329139a662f |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Antarctic Record, Vol 41, Iss 1, Pp 311-328 (1997) |
op_relation |
doi:10.15094/00008978 0085-7289 2432-079X https://doaj.org/article/54074bd8c6e44d27b601f329139a662f |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00008978 |
_version_ |
1766269123524820992 |