Fig. 1.

Sampling locations for this study overlain on water column minimum dissolved oxygen concentrations (45). New data are presented here from the eastern North Pacific at station P20 (49.6°N, 139.7°W, purple) and North Atlantic at stations USGT11-14 (27.6°N, 49.6°W, green) and USGT10-9 (17.4°N, 18.25°W, red). Previously published data are presented from station T7/P26 in the eastern North Pacific (50.0°N, 145.0°W, light blue) (46), and Southern Ocean/subantarctic stations 249 (56.1°S, 63.8°W, gray) (47), and PS71-113 (53.0°S, 0.3°W, tan) (21).