Possible source of the antarctic bottom water in the Prydz Bay Region |
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| Authors: | Takashi Yabuki Toshio Suga Kimio Hanawa Koji Matsuoka Hiroshi Kiwada Tomowo Watanabe |
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| Institution: | (1) Department of Geophysics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan;(2) The Institute of Cetacean Research, Tokyo 104-0055, Japan;(3) National Research Institute of Fisheries Science, Yokohama 236-8648, Japan |
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| 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. |
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| Keywords: | Antarctic Bottom Water Prydz Bay Amery Basin JARPA Circumpolar Deep Water Ice Shelf Water XCTD continental shelf ice shelf |
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