Possible source of the antarctic bottom water in the Prydz Bay Region

Takashi Yabuki; Toshio Suga; Kimio Hanawa; Koji Matsuoka; Hiroshi Kiwada; Tomowo Watanabe

doi:10.1007/s10872-006-0083-1

Possible source of the antarctic bottom water in the Prydz Bay Region

Takashi Yabuki, Toshio Suga, Kimio Hanawa, Koji Matsuoka, Hiroshi Kiwada, Tomowo Watanabe

SCI - Geophysics

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

It has been inferred that the Prydz Bay region is one of the source regions of Antarctic Bottom Water (AABW) based on rather indirect evidence. In order to examine this inference, we investigate the hydrographic condition of the bay based mainly on XCTD data obtained during the Japanese Whale Research Program in the Antarctic (JARPA). The JARPA hydrographic data reveal Circumpolar Deep Water (CDW), which is a salty, warm water mass approaching the shelf break, and capture Modified CDW (MCDW) intruding into the shelf water. AABW production requires mixing of CDW and cold shelf water saltier than 34.6 psu, which is a saltier type of Low Salinity Shelf Water (LSSW). Saltier LSSW is observed near the bottom over the shelf, being mixed with MCDW. We further identify saltier LSSW near the shelf break. This saltier LSSW appears close enough to unmodified CDW to be mixed with it over the continental slope, indicating a possible source of AABW in Prydz Bay.

Original language	English
Pages (from-to)	649-655
Number of pages	7
Journal	Journal of Oceanography
Volume	62
Issue number	5
DOIs	https://doi.org/10.1007/s10872-006-0083-1
Publication status	Published - 2006 Oct

Keywords

Amery Basin
Antarctic Bottom Water
Circumpolar Deep Water
Continental shelf
Ice shelf
Ice Shelf Water
JARPA
Prydz Bay
XCTD

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10.1007/s10872-006-0083-1

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title = "Possible source of the antarctic bottom water in the Prydz Bay Region",

abstract = "It has been inferred that the Prydz Bay region is one of the source regions of Antarctic Bottom Water (AABW) based on rather indirect evidence. In order to examine this inference, we investigate the hydrographic condition of the bay based mainly on XCTD data obtained during the Japanese Whale Research Program in the Antarctic (JARPA). The JARPA hydrographic data reveal Circumpolar Deep Water (CDW), which is a salty, warm water mass approaching the shelf break, and capture Modified CDW (MCDW) intruding into the shelf water. AABW production requires mixing of CDW and cold shelf water saltier than 34.6 psu, which is a saltier type of Low Salinity Shelf Water (LSSW). Saltier LSSW is observed near the bottom over the shelf, being mixed with MCDW. We further identify saltier LSSW near the shelf break. This saltier LSSW appears close enough to unmodified CDW to be mixed with it over the continental slope, indicating a possible source of AABW in Prydz Bay.",

keywords = "Amery Basin, Antarctic Bottom Water, Circumpolar Deep Water, Continental shelf, Ice shelf, Ice Shelf Water, JARPA, Prydz Bay, XCTD",

author = "Takashi Yabuki and Toshio Suga and Kimio Hanawa and Koji Matsuoka and Hiroshi Kiwada and Tomowo Watanabe",

note = "Funding Information: The authors would like to thank all the crews and researchers of the JARPA cruises, especially Hiroto Murase, Takashi Yoshida, Kazuyoshi Ohshima and Shin Itoh for the XCTD and CTD observations. We are also grateful to H. Hatanaka and S. Nishiwaki (The Institute of Cetacean Research) for their helpful assistance with this work. Comments from two anonymous reviewers were very helpful in improving the manuscript. The first author (TY) was financially supported by the 21st COE program at Tohoku University.",

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doi = "10.1007/s10872-006-0083-1",

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volume = "62",

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T1 - Possible source of the antarctic bottom water in the Prydz Bay Region

AU - Yabuki, Takashi

AU - Suga, Toshio

AU - Hanawa, Kimio

AU - Matsuoka, Koji

AU - Kiwada, Hiroshi

AU - Watanabe, Tomowo

N1 - Funding Information: The authors would like to thank all the crews and researchers of the JARPA cruises, especially Hiroto Murase, Takashi Yoshida, Kazuyoshi Ohshima and Shin Itoh for the XCTD and CTD observations. We are also grateful to H. Hatanaka and S. Nishiwaki (The Institute of Cetacean Research) for their helpful assistance with this work. Comments from two anonymous reviewers were very helpful in improving the manuscript. The first author (TY) was financially supported by the 21st COE program at Tohoku University.

PY - 2006/10

Y1 - 2006/10

N2 - It has been inferred that the Prydz Bay region is one of the source regions of Antarctic Bottom Water (AABW) based on rather indirect evidence. In order to examine this inference, we investigate the hydrographic condition of the bay based mainly on XCTD data obtained during the Japanese Whale Research Program in the Antarctic (JARPA). The JARPA hydrographic data reveal Circumpolar Deep Water (CDW), which is a salty, warm water mass approaching the shelf break, and capture Modified CDW (MCDW) intruding into the shelf water. AABW production requires mixing of CDW and cold shelf water saltier than 34.6 psu, which is a saltier type of Low Salinity Shelf Water (LSSW). Saltier LSSW is observed near the bottom over the shelf, being mixed with MCDW. We further identify saltier LSSW near the shelf break. This saltier LSSW appears close enough to unmodified CDW to be mixed with it over the continental slope, indicating a possible source of AABW in Prydz Bay.

AB - It has been inferred that the Prydz Bay region is one of the source regions of Antarctic Bottom Water (AABW) based on rather indirect evidence. In order to examine this inference, we investigate the hydrographic condition of the bay based mainly on XCTD data obtained during the Japanese Whale Research Program in the Antarctic (JARPA). The JARPA hydrographic data reveal Circumpolar Deep Water (CDW), which is a salty, warm water mass approaching the shelf break, and capture Modified CDW (MCDW) intruding into the shelf water. AABW production requires mixing of CDW and cold shelf water saltier than 34.6 psu, which is a saltier type of Low Salinity Shelf Water (LSSW). Saltier LSSW is observed near the bottom over the shelf, being mixed with MCDW. We further identify saltier LSSW near the shelf break. This saltier LSSW appears close enough to unmodified CDW to be mixed with it over the continental slope, indicating a possible source of AABW in Prydz Bay.

KW - Amery Basin

KW - Antarctic Bottom Water

KW - Circumpolar Deep Water

KW - Continental shelf

KW - Ice shelf

KW - Ice Shelf Water

KW - JARPA

KW - Prydz Bay

KW - XCTD

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DO - 10.1007/s10872-006-0083-1

M3 - Article

AN - SCOPUS:33748436809

SN - 0916-8370

VL - 62

SP - 649

EP - 655

JO - Journal of Oceanography

JF - Journal of Oceanography

IS - 5

ER -

Possible source of the antarctic bottom water in the Prydz Bay Region

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Keywords

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