July 2020 Overturning in the Subpolar North Atlantic Program (OSNAP) cruise aboard the R/V Neil Armstrong led by Chief Scientist Bob Pickart. Photo: Leah McRaven, Andy Davies and Jim Dunn prepare the CTD rosette for an optode calibration dip. The optodes strapped to the rosette will measure oxygen on the OSNAP moorings southeast of Greenland until 2022, as part of a new side-project led by Isabela Le Bras to investigate convection in boundary currents and the coupling of physical and biogeochemical processes in this critical region. Photo credit: Frank Bahr, WHOI.