Observed features of stable surface seawater isotopes across the Pacific, Indian and Southern oceans

Xuemei Wu; Weijun Sun; Biao Tian; Baojuan Huai; Zhiheng Du; Minghu Ding

doi:10.1007/s13131-024-2378-8

Volume 43 Issue 10

Oct. 2024

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Xuemei Wu, Weijun Sun, Biao Tian, Baojuan Huai, Zhiheng Du, Minghu Ding. Observed features of stable surface seawater isotopes across the Pacific, Indian and Southern oceans[J]. Acta Oceanologica Sinica, 2024, 43(10): 33-39. doi: 10.1007/s13131-024-2378-8

Citation:

Xuemei Wu, Weijun Sun, Biao Tian, Baojuan Huai, Zhiheng Du, Minghu Ding. Observed features of stable surface seawater isotopes across the Pacific, Indian and Southern oceans[J]. Acta Oceanologica Sinica, 2024, 43(10): 33-39. doi: 10.1007/s13131-024-2378-8

Citation:

Xuemei Wu, Weijun Sun, Biao Tian, Baojuan Huai, Zhiheng Du, Minghu Ding. Observed features of stable surface seawater isotopes across the Pacific, Indian and Southern oceans[J]. Acta Oceanologica Sinica, 2024, 43(10): 33-39. doi: 10.1007/s13131-024-2378-8

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Observed features of stable surface seawater isotopes across the Pacific, Indian and Southern oceans

doi: 10.1007/s13131-024-2378-8

1.
College of Geography and Environment, Shandong Normal University, Jinan 250014, China
2.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China
3.
State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

Funds: The National Natural Science Foundation of China under contract No. 42122047; the Basic Research Fund of Chinese Academy of Meteorological Sciences under contract Nos 2021Z006, 2023Z015 and 2023Z005; the Chinese National Antarctic Science Expedition.

More Information

Corresponding author: dingminghu@foxmail.com
Received Date: 2024-01-29
Accepted Date: 2024-03-24

Available Online: 2024-07-29

Publish Date: 2024-10-25

Abstract

Abstract

The marine hydrological process is still unclear due to scarce observations. Based on stable water isotopes in surface seawater along the 33rd Chinese National Antarctic Science Expedition from November 2016 to April 2017, this study explored the hydrological processes in the Pacific, Indian and Southern oceans. The results show that the Northwest Pacific (0°–26°N) is a region with strong evaporation (the δ¹⁸O-δD slope is 6.58), while the southern Indian Ocean is a region with strong precipitation (the δ¹⁸O-δD slope is 9.57). The influence of continental runoff and water mass mixing reduces the correlation between δ¹⁸O and salinity in the eastern Indian Ocean. The characteristics of the isotopes and hydrological parameters indicate that the Agulhas Front and sub-Tropical Convergence do not merge in the Antarctic–Indian Ocean region. The freezing of sea ice near the Antarctic continent decreases the δ¹⁸O and δD by 0.40‰ and 7.0‰, respectively, compared with those near 67°S. This study is helpful for understanding marine hydrological processes and promoting the understanding and research of the nature of ocean responses in the context of climate change.
- spatial variability,
- surface seawater isotopes,
- δ¹⁸O-salinity relation,
- water mass fronts

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