Cruise Report for the 2018 US GO-SHIP Reoccupation of I07N Section (Last edited 12 July 2018) Leg 1 NOAA Ship Ronald H Brown 23 April 2018 – 15 May 2018 Durban, South Africa – Victoria, Seychelles Chief Scientist: Dr. Denis L. Volkov National Oceanic and Atmospheric Administration, AOML Cooperative Institute for Marine and Atmospheric Studies, University of Miami Co-Chief Scientist: Dr. Viviane Menezes Woods Hole Oceanographic Institution Leg 2 NOAA Ship Ronald H Brown 19 May 2018 – 6 June 2018 Victoria, Seychelles – Goa, India Chief Scientist: Dr. Denis L. Volkov National Oceanic and Atmospheric Administration, AOML Cooperative Institute for Marine and Atmospheric Studies, University of Miami Co-Chief Scientist: Dr. Viviane Menezes Woods Hole Oceanographic Institution CTD Data Submitted by: Kristene E. McTaggart Pacific Marine Environmental Laboratory (PMEL) National Oceanic and Atmospheric Administration (NOAA) Seattle, WA Preliminary Bottle Data Submitted by: Denis L. Volkov National Oceanic and Atmospheric Administration, AOML Cooperative Institute for Marine and Atmospheric Studies, University of Miami 1 Table of Contents Cruise Summary Information ....................................................................................................................... 4 1. INTRODUCTION............................................................................................................................................. 6 2. PARTICIPANTS ............................................................................................................................................... 7 2.1. PARTICIPATING INSTITUTIONS ...................................................................................................................... 7 2.2. PROGRAMS AND PRINCIPAL INVESTIGATORS ................................................................................................... 7 2.3. SCIENTIFIC PERSONNEL (LEGS 1 AND 2) ......................................................................................................... 8 3. PROGRAM AND PROJECT OVERVIEW ............................................................................................................ 9 4. THE I07N SECTION ......................................................................................................................................... 9 5. CRUISE NARRATIVE ..................................................................................................................................... 11 5.1. START OF THE CRUISE ............................................................................................................................... 11 5.2. FOREIGN CLEARANCES .............................................................................................................................. 11 5.3. ISSUES WITH THE AFT WINCH ..................................................................................................................... 12 5.4. ATTEMPT TO FIND A PMEL MOORING ......................................................................................................... 12 5.5. CTD WIRE SITUATION .............................................................................................................................. 13 5.6. SCIENTIFIC STAFFING ................................................................................................................................ 13 6. UNDERWAY DATA ACQUISITION ................................................................................................................. 13 6.1. ACOUSTIC DOPPLER CURRENT PROFILER MEASUREMENTS ............................................................................... 14 6.2. UNDERWAY PCO2 ANALYSES ..................................................................................................................... 14 7. CONDUCTIVITY, TEMPERATURE, DEPTH (CTD) STATIONS ............................................................................ 15 7.1. CTD DATA ACQUISITION ........................................................................................................................... 15 7.2. CTD DATA PROCESSING ............................................................................................................................ 16 7.3. PRESSURE CALIBRATION ........................................................................................................................... 17 7.4. TEMPERATURE CALIBRATION ..................................................................................................................... 17 7.5. CONDUCTIVITY CALIBRATION ..................................................................................................................... 18 7.6. OXYGEN CALIBRATION ............................................................................................................................. 18 7.7. DISCRETE NISKIN SAMPLING ...................................................................................................................... 19 7.8. BOTTLE DATA PROCESSING ........................................................................................................................ 20 7.9. COLLECTED SAMPLES ............................................................................................................................... 20 8. SHIP-BOARD ANALYSIS SECTION ................................................................................................................. 21 8.1. TEMPERATURE ....................................................................................................................................... 21 8.2. SALINITY ............................................................................................................................................... 21 8.3. DISSOLVED OXYGEN ................................................................................................................................ 21 8.4. TOTAL CO2 ........................................................................................................................................... 22 8.5. TOTAL ALKALINITY / PH ........................................................................................................................... 22 8.6. NUTRIENTS ........................................................................................................................................... 23 8.7. CHLOROFLUOROCARBONS (CFCS) / SF6 ....................................................................................................... 24 9. INDIVIDUAL SUB-PROJECT REPORTS ........................................................................................................... 25 9.1. DEPLOYMENTS ....................................................................................................................................... 25 9.1.1. Argo floats .................................................................................................................................... 25 9.1.2. Surface Velocity Program (SVP) drifters......................................................................................... 25 9.1.3. Wave buoys ................................................................................................................................... 26 9.2. LOWERED ACOUSTIC DOPPLER CURRENT PROFILER (ADCP) ............................................................................. 27 9.4. DISSOLVED OXYGEN (DISCRETE) ................................................................................................................. 32 2 9.5. DISSOLVED INORGANIC CARBON (DIC) ........................................................................................................ 34 9.6. DISCRETE PH ANALYSES ........................................................................................................................... 36 9.7. TOTAL ALKALINITY .................................................................................................................................. 37 9.8. NUTRIENTS ........................................................................................................................................... 39 9.9. CHLOROFLUOROCARBONS (CFCS) AND SULFUR HEXAFLUORIDE (SF6) ................................................................ 40 9.10. DOC AND TDN SAMPLING ....................................................................................................................... 42 9.11. GENETICS AND PARTICULATE ORGANIC MATTER ............................................................................................ 43 9.12. DISSOLVED INORGANIC CARBON ISOTOPES IN SEAWATER (DI14C) ..................................................................... 44 9.13. DISSOLVED ORGANIC MATTER 14C, BLACK CARBON 14C .................................................................................... 45 9.14. DOM BIOMARKERS AND MOLECULAR COMPOSITION ..................................................................................... 46 9.15. DISSOLVED CALCIUM ............................................................................................................................... 48 9.16. DENSITY (JAMSTEC) .............................................................................................................................. 49 9.18. TRANSMISSOMETER MEASUREMENTS ......................................................................................................... 50 9.19. BIOLOGICAL UNDERWAY MEASUREMENTS ..................................................................................................