Guo, Jiaying and Yang, Xufeng and Zhao, Jun and Zhu, Yuanli and Li, Dong and Pan, Jianming (2023) Distributions of dissolved oxygen and apparent oxygen utilization in the Cosmonaut Sea and Amundsen Sea in austral summer 2021. Advances in Polar Science, 34 (4). pp. 272-303.
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Abstract
Dissolved oxygen (DO) and apparent oxygen utilization (AOU) are crucial parameters for investigating marine ecosystem evolution and the marine environment. In this study, DO and AOU data were obtained and their spatial distribution characteristics were explored in the Cosmonaut Sea and Amundsen Sea in austral summer 2021. The standard deviation range of DO parallel samples was < 0.1–3.7 μmol·L–1, which met the accuracy requirements of the survey method. The DO concentration decreased sharply with water depth in the photic zone and increased slowly to the bottom. AOU in the surface layer of the two seas was significantly negatively correlated with chlorophyll a (p < 0.01), and AOU was significantly lower in the south Cosmonaut Sea than in the north Cosmonaut Sea and Amundsen Sea (p < 0.01). In austral summer, AOU was as low as < 130 μmol·L–1 in the nearshore Cosmonaut Sea with thicker Antarctic Surface Water down to ca. 500 m. In early winter, AOU was lower than 50 μmol·L–1 in the north Amundsen Sea in subsurface water (75–150 m). The unmodified Circumpolar Deep Water with high AOU (> 160 μmol·L–1) could surge up to ca. 150–200 m in both seas, with stronger intrusion in the Amundsen Sea. The AOU in bottom water was significantly lower (p < 0.01) in the Cosmonaut Sea (118.9±11.8 μmol·L–1) than the Amundsen Sea (141.7±7.4 μmol·L–1), indicating the stable existence of fresh oxygen-rich Antarctic Bottom Water in the Cosmonaut Sea.
| Item Type: | Article |
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| Related URLs: | |
| Keywords: | dissolved oxygen, apparent oxygen utilization, Antarctic, Cosmonaut Sea, Amundsen Sea |
| Subjects: | Natural Environment > Atmosphere Natural Environment > Oceans |
| Organizations: | Unspecified |
| Date Deposited: | 06 Feb 2025 14:13 |
| URI: | http://library.arcticportal.org/id/eprint/2879 |
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