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 Leg1
Research Cruise
Ship
Equilibrator-IR or CRDS or GC
33HH20150901 Autumn Bottom Trawl Survey
Autumn Bottom Trawl Survey, AOML_SOOP_CO2
North Atlantic
-75.9
-69.3
41.5
34.5
20150901
20150917
Newport, RI
Henry B. 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. Because of the instability of the barometric pressure sensor during the first 46 hours, the outside atmospheric pressure at sea surface was estimated by subtracting 1.29 mbar from the LICOR pressure. Original Data Location: http://www.aoml.noaa.gov/ocd/ocdweb/bigelow/bigelow_introduction.html
NA
underway