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<p>The Northwest Pacific subtropical ocean circulation system&#xa0;is complex with a unique marine water mass structure. In the open ocean, water masses are primarily defined by temperature and salinity, though attributing their relative contributions solely based on these two parameters is challenging. This study used the Optimal Multi-Parameter (OMP) analysis method with conservative uranium isotope tracers, to reveal the relative contribution rates of North Pacific Tropical Surface Water (NPTSW), North Pacific Subtropical Mode Water (NPSMW), North Pacific Intermediate Water (NPIW), and North Pacific Deep Water (NPDW) along the 28.5°N transect of the Northwest Pacific in winter. Considering surface-deep water interactions become negligible due to distinct hydrodynamic regimes when the depth of water column is larger than 2000&#xa0;m, the water column is divided into upper ocean layer (&lt; 1000&#xa0;m, mainly affected by NPTSW, NPSMW and NPIW) and deep ocean layer (&gt; 1000&#xa0;m, mainly affected by NPSMW, NPIW and NPDW). The results show that these water masses have primary ranges as: NPTSW (0–400&#xa0;m), NPSMW (200–500&#xa0;m of the eastern transect), NPIW (400–1000&#xa0;m), NPDW (&gt; 1200&#xa0;m) respectively. The use of uranium isotopes avoids interference from biogeochemical processes, enabling a more accurate calculation of the relative contributions of different water masses.</p>

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Uranium isotopes in optimal multi-parameter (OMP) analysis: unraveling water masses mixing in the northwest pacific

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Yude Ni,
  • Xueyan Jiang,
  • Xihuang Zhong,
  • Tianwei Shang

摘要

The Northwest Pacific subtropical ocean circulation system is complex with a unique marine water mass structure. In the open ocean, water masses are primarily defined by temperature and salinity, though attributing their relative contributions solely based on these two parameters is challenging. This study used the Optimal Multi-Parameter (OMP) analysis method with conservative uranium isotope tracers, to reveal the relative contribution rates of North Pacific Tropical Surface Water (NPTSW), North Pacific Subtropical Mode Water (NPSMW), North Pacific Intermediate Water (NPIW), and North Pacific Deep Water (NPDW) along the 28.5°N transect of the Northwest Pacific in winter. Considering surface-deep water interactions become negligible due to distinct hydrodynamic regimes when the depth of water column is larger than 2000 m, the water column is divided into upper ocean layer (< 1000 m, mainly affected by NPTSW, NPSMW and NPIW) and deep ocean layer (> 1000 m, mainly affected by NPSMW, NPIW and NPDW). The results show that these water masses have primary ranges as: NPTSW (0–400 m), NPSMW (200–500 m of the eastern transect), NPIW (400–1000 m), NPDW (> 1200 m) respectively. The use of uranium isotopes avoids interference from biogeochemical processes, enabling a more accurate calculation of the relative contributions of different water masses.