Figure F7. Meridional cross section of water masses, characterized by dissolved oxygen concentrations in the southeast Pacific (Ocean Climate Laboratory, 1999). Southward-spreading middepth waters (PCW = Pacific Central Water) are characterized by relatively low oxygen and salinity and high nutrients. Northward-flowing bottom water, below ~3 km depth, starts as relatively oxygen-rich Antarctic Circumpolar Deep Water (CPDW). Northward-spreading Antarctic Intermediate Water (AAIW), above 1 km depth, is high in oxygen but is low in both salinity and nutrients. The Gunther Undercurrent (GU) flows southward between 100 and 400 m water depth and is characterized by relatively low oxygen, high nutrients, and high salinity.]

Figure F7. Meridional cross section of water masses, characterized by dissolved oxygen concentrations in the southeast Pacific (Ocean Climate Laboratory, 1999). Southward-spreading middepth waters (PCW = Pacific Central Water) are characterized by relatively low oxygen and salinity and high nutrients. Northward-flowing bottom water, below ~3 km depth, starts as relatively oxygen-rich Antarctic Circumpolar Deep Water (CPDW). Northward-spreading Antarctic Intermediate Water (AAIW), above 1 km depth, is high in oxygen but is low in both salinity and nutrients. The Gunther Undercurrent (GU) flows southward between 100 and 400 m water depth and is characterized by relatively low oxygen, high nutrients, and high salinity.