Long-term bottom water warming in the north Ross Sea |
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| Authors: | Hirokazu Ozaki Hajime Obata Mikio Naganobu Toshitaka Gamo |
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| Institution: | (1) Marine Inorganic Chemistry Group, Ocean Research Institute, The University of Tokyo, Minamidai, Nakano-ku, Tokyo 164-8639, Japan;(2) Southern Ocean Living Resources Research Section, Oceanic Resources Division, National Research Institute of Far Seas Fisheries, Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan;(3) Present address: Integrated Research System for Sustainable Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | We measured potential temperature, salinity, and dissolved oxygen profiles from the surface to the bottom at two locations
in the north Ross Sea (65.2°S, 174.2°E and 67.2°S, 172.7°W) in December 2004. Comparison of our data with previous results
from the same region reveals an increase in potential temperature and decreases in salinity and dissolved oxygen concentration
in the bottom layer (deeper than 3000 m) over the past four decades. The changes were significantly different from the analytical
precisions. Detailed investigation of the temperature, salinity, dissolved oxygen and σ
3 value distributions and the bottom water flow in the north Ross Sea suggests a long-term change in water mass mixing balance.
That is to say, it is speculated that the influence of cool, saline, high-oxygen bottom water (high-salinity Ross Sea Bottom
Water) formed in the southwestern Ross Sea has possibly been decreased, while the influences of relatively warmer and fresher
bottom water (low-salinity Ross Sea Bottom Water) and the Adélie Land Bottom Water coming from the Australia-Antarctic Basin
have increased. The possible impact of global warming on ocean circulation needs much more investigation. |
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| Keywords: | Bottom water circulation dissolved oxygen long-term change potential temperature Ross Sea salinity |
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