Kevin SullivanAOML/NOAA
4301 Rickenbacker Causeway
305-361-4382Kevin.Sullivan@noaa.govMillero, FrankRSMAS/University of Miami
4600 Rickenbacker Causeway, Miami Fl, 33149
305-421-4707FMillero@rsmas.miami.eduWanninkhof, RikAOML/NOAA
4301 Rickenbacker Causeway, Miami Fl, 33149
305-361-4379Rik.Wanninkhof@noaa.govNOAA Climate Program Office; NOAA Ocean Acidification ProgramWS1304Research Cruise33WA20130331DHW Plankton Study; SOOP_CO2Gulf of Mexico-89.1-81.230.424.52013033120130418Miami, FLGulfport, MSF.G. Walton Smith33WAUniversity of MiamixCO2_EQU_ppmMole fraction of CO2 in the equilibrator headspace (dry) at equilibrator temperature (ppm)xCO2_ATM_ppmMole fraction of CO2 measured in dry outside air (ppm)xCO2_ATM_interpolated_ppmMole 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_hPaBarometric pressure in the equilibrator headspace (hectopascals)PRES_ATM@SSP_hPaBarometric pressure measured outside, corrected to sea level (hectopascals)TEMP_EQU_CWater temperature in equilibrator (degrees Celsius)SST_CSea surface temperature (degrees Celsius)SAL_permilSea surface salinity on Practical Salinity Scale (permil)fCO2_SW@SST_uatmFugacity of CO2 in sea water at SST and 100% humidity (microatmospheres)fCO2_ATM_interpolated_uatmFugacity of CO2 in air corresponding to the interpolated xCO2 at SST and 100% humidity (microatmospheres)dfCO2_uatmSea water fCO2 minus interpolated air fCO2 (microatmospheres)WOCE_QC_FLAGQuality control flag for fCO2 values (2=good, 3=questionable)QC_SUBFLAGQuality control subflag for fCO2 values, provides explanation when QC flag=31.5 metersBowSprayhead above dynamic pool, with thermal jacket0.95 L (0.4 L water, 0.55 L headspace)1.5 - 2.0 L/min70 - 150 ml/minYesGas 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 equilibratorYes, 5 readings in a group every 4 hoursMast above the bridge, ~13 meters above sea surfaceGas stream passes through a thermoelectric condenser (~5 °C) and then through a Perma Pure (Nafion) dryer before reaching the analyzer (90% dry).Infrared absorption of dry sample gasLI-COR6262Every 140 seconds, except during calibration 0.01 microatmosphere± 1 microatmospheres0.01 ppm± 0.2 ppmAirgas, Inc. -
Std 1: 202.52 ppm / Std 2: 391.28 ppm / Std 3: 628.68 ppm / Std 4: 1479.07 ppm The analyzer is calibrated every 4 hours with field standards that in turn were calibrated with primary standards that are directly traceable to the WMO scale. Instrument is located in an air-conditioned laboratory. 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.After sea water pump SeabirdSBE-38± 0.001 °C0.00025 °CFactory calibrationManufacturer's Resolution is taken as Precision; Maintained by ship.Inserted into equilibrator ~5 cm below water levelHart1523± 0.015 °C0.001 °CFactory calibration0.2 - 0.5 °CManufacturer's Resolution is taken as Precision.Attached to equilibrator headspaceSetra239± 0.052 hPa0.01 hPaFactory calibrationDifferential pressure reading from Setra-239 attached to the equilibrator headspace was added to the pressure reading of the analyzer to yield the equilibrator pressure. Manufacturer's Resolution is taken as Precision.On mast above the bridge at ~13 m above the sea surface waterR.M. Young61302± 0.3 hPa 0.1 hPaFactory calibrationManufacturer's Resolution is taken as Precision; Maintained by ship.In dry lab SeabirdSBE 45± 0.005 permil0.0002 permilFactory calibrationManufacturer's Resolution is taken as Precision; Maintained by ship.attached to CO2 analyzer exit to labSetra270± 0.05 hPa0.015 hPaFactory calibrationPressure reading from the Setra-270 on the exit of the analyzer was added to the differential pressure reading from Setra-239 attached to the equilibrator headspace to yield the equilibrator pressure.The pCO2 analytical system operated well during this cruise. For 570 analyses while the ship steamed to Gulfport, no ship sensors were recorded. For these anlayses the salinity was assigned a value of 35 psu, the SST was estimated by subtracting 0.32 degree Celsius from the equilibrator temperature, and the barometric pressure was estimated by subtracting 3.3 mbar from the LICOR pressure. For 8600 analyses with ship sensor data, the difference between the SBE-38 and equilibrator temperatures was 0.316 (+/-0.078) degrees Celsius and the difference between the LICOR and R.M. Young pressures was 3.26 (+/-0.55) mbar. http://www.aoml.noaa.gov/ocd/ocdweb/wsmith/wsmith_introduction.htmlAll fCO2 underway data from the R/V F.G. Walton Smith are posted on this site.underway