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

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

Research output: Contribution to journalArticlepeer-review

41 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 languageEnglish
Pages (from-to)649-655
Number of pages7
JournalJournal of Oceanography
Volume62
Issue number5
DOIs
Publication statusPublished - 2006 Oct 1

Keywords

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

ASJC Scopus subject areas

  • Oceanography

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