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. 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. doi: 10.1007/s13131-024-2378-8
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. 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. doi: 10.1007/s13131-024-2378-8
College of Geography and Environment, Shandong Normal University, Jinan 250014, China
2.
State Key Laboratory of Severe Weather/Institute of Global Change & Polar Meteorology, 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 No. 42122047; the Basic Research Fund of CAMS Nos 2021Z006, 2023Z015 and 2023Z005; the CHINARE.
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 subtropical 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.
Figure 3. Spatial variations of δ18O, δD, excess deuterium (d), salinity and SST (due to the absence of salinity and SST data for samples between 20°N and 35°N, data from 70°S to 20°N are clustered together). Different colored points represent various clusters, ranging from 70°S to 20°N, labeled as cluster 1, cluster 2, cluster 3, cluster 4. and cluster 5. (n=54)
Figure 4. The relationship between δD and δ18O in surface seawater.
Figure 5. The quantitative relationship between δ18O, δD and salinity.
Figure 6. The relationship between salinity and δ18O in different sea areas.
Figure 7. The change of temperature field: Fig. 7a is the relationship between SST and salinity, and Fig. 7b is the relationship between surface sea temperature and latitude. (AF, Agulhas Front; STC, Sub-Tropical Convergence; SAF, Sub-Antarctic Front; APF, Antarctic Polar Front).
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