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 |