Supplemental Table 1: Save-2 samples: Station number and location, and sample depth (m), density (sigma), oxygen concentration (micromol/kg), oxygen saturation (%), and delta18O (‰) Depth (m) sigma0 O2 micromol/kg O2 sat (%) delta18O (‰) Station 62 10.71°S, 10.39°E 185 26.54 56.28 22.83 17.52 370 26.91 20.49 7.60 21.60 505 27.08 29.57 10.37 17.48 945 27.40 130.76 41.32 8.84 1600 27.74 212.96 66.57 5.04 2060 27.80 229.99 70.95 4.58 Station 64 11.12°S, 7.83°E 660 27.2365 75.61613538 24.69 12.368 Station 67 11.79°S, 3.47°E 2 24.65 212.69 103.83 0.50 115 26.55 54.33 22.25 17.80 180 26.68 61.50 23.86 15.74 290 26.84 55.73 21.07 14.72 470 27.04 32.63 11.87 17.66 540 27.11 35.59 12.34 15.88 674 27.22 66.49 21.81 12.06 835 27.31 111.33 35.50 9.24 Station 69 12.22°S, 1.01°E 216 26.77 37.45 14.40 19.15 380 26.97 39.82 14.42 15.71 1495 27.71 200.59 62.74 5.54 2075 27.80 227.37 69.81 4.57 Station 71 12.76°S, 1.88°W 2 24.87 211.32 102.77 0.88 115 26.46 87.67 35.75 8.11 215 26.79 45.52 17.27 17.64 312 26.93 47.50 17.56 15.12 492 27.09 50.73 17.61 13.15 650 27.22 69.81 22.62 11.73 800 27.30 110.52 35.22 9.33 950 27.40 144.11 45.52 7.66 1450 27.70 201.80 62.86 5.29 1934 27.79 227.16 69.96 4.47 Depth (m) sigma0 O2 micromol/kg O2 sat (%) delta18O (‰) Station 74 13.57°S, 6.17°W 165 26.49 111.57 44.30 8.39 244 26.81 53.17 19.77 14.42 815 27.32 148.08 47.09 7.08 Station 76 13.98°S, 8.52°W 245 26.71 64.57 24.97 12.89 245 26.71 64.47 24.97 12.63 380 27.00 80.92 28.97 10.46 769 27.30 155.23 46.66 6.93 914 27.38 156.90 49.26 6.71 1960 27.79 234.68 72.45 3.98 Station 82 15.24°S, 15.57°W 2 24.90 207.81 102.60 0.81 173 26.39 167.01 67.51 5.83 330 26.81 123.90 45.70 7.90 410 27.03 122.23 42.42 8.13 971 27.39 166.77 52.24 6.52 Station 84 15.68°S, 17.94°W 270 26.54 178.87 69.91 5.60 425 26.99 130.07 45.48 7.51 Station 87 16.30°S, 21.48W 380 26.80 140.20 51.84 7.17 450 27.01 140.45 48.74 7.17 780 27.31 181.66 57.72 5.76 1210 27.55 186.41 58.06 5.76 1500 27.70 215.60 67.00 4.65 Station 94 17.76°S, 29.89°W 2400 27.83 257.74 76.35 3.38 Station 95 18.00°S, 30.98°W 495 26.84 165.44 62.90 5.94 800 27.30 188.98 59.11 5.40 900 27.36 193.08 61.17 5.49 Depth (m) sigma0 O2 micromol/kg O2 sat (%) delta18O (‰) Station 95 18.00°S, 30.98°W 1000 27.43 184.33 57.27 5.80 1275 27.61 197.20 61.70 5.43 1570 27.75 227.68 73.42 4.18 Station 97 18.28°S, 33.40°W 465 26.81 238.36 86.88 3.35 805 27.29 190.36 59.33 5.46 4375 27.84 227.34 64.30 4.45 Station 99 18.56°S, 33.72°W 2 24.00 194.49 103.81 0.33 455 26.81 181.35 65.32 5.58 740 27.23 192.75 61.64 5.31 970 27.39 193.23 59.60 5.56 1155 27.50 190.73 58.48 5.65 2400 27.83 257.33 78.70 3.19 2400 27.83 256.06 78.70 3.12 2400 27.83 255.50 78.70 3.19 2400 27.83 256.07 78.70 3.05 2400 27.83 256.42 78.70 3.30 2400 27.83 256.48 78.70 3.28 Station 100 18.62°S, 36.22°W 1650 27.77 245.45 77.41 3.74 2160 27.83 254.91 78.42 3.57 3000 27.84 254.44 77.73 3.63 3540 27.85 255.50 77.29 3.56 3735 27.85 250.27 74.98 3.75 3920 27.85 236.22 68.75 4.50