US GO-SHIP Level 2 measurements are core measurements (highly desirable with stringent data policy and timeline for submission of data):

• Tritium-3He
  

  Transmissometer mounted on the CTD rosette

• Discrete pCO2
• 14C by AMS
• CCl4
• δ13C of DIC
• Fe/trace metals
• CTD Transmissometer
• Surface underway system (nutrients, O2, Chl, skin temperature)
• CFC-113
• N2O