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Table 3 δD and δ18O values of water masses on the Okinawa Trough and Pacific sides of the southern Ryukyu Island Arc

From: Characterization of water masses around the southern Ryukyu Islands based on isotopic compositions

Water mass Depth (m) δD (‰) δ18O (‰)
Minimum Average Maximum Standard deviation Minimum Average Maximum Standard deviation
Okinawa Trough side
Kuroshio Surface Water < 100 4.5* 0.5*
Kuroshio Tropical Water 100− 200 2.4 3.6 4.8 0.61 0.1 0.4 0.6 0.13
Western North Pacific Central Water 250− 500 1.0 3.1 5.2 1.04 0.1 0.4 0.7 0.14
Kuroshio Intermediate Water 500− 755 − 0.9 1.0 2.9 0.95 − 0.1 0.2 0.4 0.13
Deeper Kuroshio Intermediate Water 755− 1900 − 1.2 0.4 1.9 0.76 − 0.2 0.0 0.3 0.11
Bottom water 1900− 1938
Pacific side
Surface water  < 83 1.0 3.3 5.7 1.17 0.1 0.4 0.7 0.14
North Pacific Tropical Water 99− 216 1.8 3.4 5.0 0.82 0.2 0.4 0.7 0.13
Western North Pacific Central Water 222− 476 0.7 3.1 5.4 1.17 0.1 0.4 0.7 0.16
North Pacific Intermediate Water 478− 863 − 0.9 1.3 3.5 1.10 − 0.2 0.1 0.5 0.17
Deeper North Pacific Intermediate Water 864− 1851 − 0.7 0.5 1.7 0.62 − 0.2 0.1 0.3 0.11
Pacific Deep Water 1907− 2620 − 1.0 0.7 2.4 0.86 − 0.1 0.0 0.2 0.08
  1. *Only one data available