Kevin Sullivan NOAA/Atlantic Oceanographic & Meteorological Laboratory

4301 Rickenbacker Causeway

305-361-4382 Kevin.Sullivan@noaa.gov Rik Wanninkhof NOAA/Atlantic Oceanographic & Meteorological Laboratory

4301 Rickenbacker Causeway, Miami Fl, 33149

305-361-4379 Rik.Wanninkhof@noaa.gov datasetID NOAA Climate Program Office; NOAA Ocean Acidification Program 20150830 20150830 HB1506 Leg3 Research Cruise Ship Equilibrator-IR or CRDS or GC 33HH20151007 Autumn Bottom Trawl Survey, AOML_SOOP_CO2 North Atlantic -71.5 -65.8 44.3 40.1 20151007 20151022 Newport, RI R/V Henry Bigelow 33HH NOAA xCO2_EQU_ppm Mole fraction of CO2 in the equilibrator headspace (dry) at equilibrator temperature (ppm) xCO2_ATM_ppm Mole fraction of CO2 measured in dry outside air (ppm) xCO2_ATM_interpolated_ppm Mole fraction of CO2 in outside air associated with each water analysis. These values are interpolated between the bracketing averaged good xCO2_ATM analyses (ppm) PRES_EQU_hPa Barometric pressure in the equilibrator headspace (hPa) PRES_ATM@SSP_hPa Barometric pressure measured outside, corrected to sea level (hPa) TEMP_EQU_C Water temperature in equilibrator (°C) SST_C Sea surface temperature (°C) SAL_permil Sea surface salinity on Practical Salinity Scale (o/oo) fCO2_SW@SST_uatm Fugacity of CO2 in sea water at SST and 100% humidity (μatm) fCO2_ATM_interpolated_uatm Fugacity of CO2 in air corresponding to the interpolated xCO2 at SST and 100% humidity (μatm) dfCO2_uatm Sea water fCO2 minus interpolated air fCO2 (μatm) WOCE_QC_FLAG Quality control flag for fCO2 values (2=good, 3=questionable) QC_SUBFLAG Quality control subflag for fCO2 values, provides explanation when QC flag=3 3 meters Bow Spray head above dynamic pool with thermal jacket 0.95 L (0.4 L water, 0.55 L headspace) 1.5 - 2.0 L/min 70 - 150 ml/min Yes Gas stream passes through a thermoelectric condenser (~5 °C) and then through a Perma Pure (Nafion) dryer before reaching the analyzer (90% dry). Primary equilibrator is vented through a secondary equilibrator. Yes, 5 readings in a group every 3.5 hours Mast above the bridge, ~35 meters above sea surface Gas stream passes through a thermoelectric condenser (~5 °C) and then through a Perma Pure (Nafion) dryer before reaching the analyzer (90% dry). IR LI-COR 6262 Every 140 seconds, except during calibration ± 0.01 μatm in fCO2_SW ± 2 μatm in fCO2_SW ± 0.01 μatm in fCO2_ATM ± 0.5 μatm in fCO2_ATM Std 1: JA02166, 232.80 ppm, owned by AOML, used every ~3.5 hours. Std 2: JB03651, 306.46 ppm, owned by AOML, used every ~3.5 hours. Std 3: JB03591, 409.69 ppm, owned by AOML, used every ~3.5 hours. Std 4: JB03285, 565.58 ppm, owned by AOML, used every ~3.5 hours. Std 5: 0.00 ppm, owned by AOML, used every ~17.0 hours. The analyzer is calibrated every 3.5 hours with field standards that in turn were calibrated with primary standards that are directly traceable to the WMO scale. The zero gas is ultra-high purity air. Instrument is located in an air-conditioned laboratory. Ultra-High Purity air (0.0 ppm CO2) and the high standard gas are used to zero and span the LI-COR analyzer. Pierrot, D., C. Neil, K. Sullivan, R. Castle, R. Wanninkhof, H. Lueger, T. Johannessen, A. Olsen, R. A. Feely, and C. E. Cosca (2009), Recommendations for autonomous underway pCO2 measuring systems and data reduction routines, Deep-Sea Res II, 56, 512-522. details of CO2 sensing (not required) xco2(dry) After sea water pump, ~3 m below sea surface Seabird, Inc. SBE 38 0.001 0.0003 Factory calibration Manufacturer's Resolution is taken as Precision; Maintained by ship. Inserted into equilibrator ~5 cm below water level Hart 1523 0.015 0.0003 Factory calibration Resolution is taken as Precision. Attached to equilibrator headspace. Differential pressure reading from Setra 239 attached to the equilibrator headspace is added to the pressure reading from the LICOR, which is measured by an external Setra 270 connected to the exit of the analyzer. Setra 270 ± 0.15 0.015 Factory calibration Manufacturer's Resolution is taken as Precision. yes On mast above the bridge at ~35 m above sea surface water Vaisala PTB220 ± 0.15 hPa 0.01 hPa Factory calibration Manufacturer's Resolution is taken as Precision; Maintained by ship. In dry lab after a debubbler, next to CO2 system Seabird SBE 45 ± 0.005 o/oo 0.0002 o/oo Factory calibration Manufacturer's Resolution is taken as Precision; Maintained by ship. The analytical system behaved well throughout the cruise. Original Data Location: http://www.aoml.noaa.gov/ocd/ocdweb/bigelow/bigelow_introduction.html NA underway