Partial pressure (or fugacity) of carbon dioxide, water temperature, salinity and other variables collected from time series observations from Mooring Kangaroo_Island_35S_136E deployed in the South Australian Basin near Kangaroo_Island (NCEI Accession 0253461)

This dataset includes chemical, meteorological, physical time series data collected from Mooring Kangaroo_Island_35S_136E deployed in the South Australian Basin near Kangaroo_Island, from 2012-02-08 to 2025-05-26. These data include mole fraction of CO2 in the equilibrator head space, mole fraction of CO2 in the atmosphere, fugacity of carbon dioxide at surface water, corrected for water vapour at surface water salinity and temperature, delta fCO2 = (fCO2_WET_SW - fCO2_WET_AIR), atmospheric pressure, equilibrator pressure, sea surface temperature, equilibrator temperature and sea surface salinity. Measurements in the dataset are made with a Battelle Seaology pCO2 monitoring system (MApCO2), a Seabird SBE16plusV2 CTD, mounted on a surface buoy similar to the system described in Sutton et al. (2014), with an Aanderaa optode used to measure dissolved oxygen concentrations. The seawater sensor intakes for the MapCO2, SBE16Plus V2 and the optode are located at about 1m water depth. The CO2 measurement uses a bubble equilibrator (Sutton et al., 2014), where the air from the equilibrator headspace is circulated through a LI-COR 820 non-dispersive infrared detector (NDIR) for measurement of CO2. The system carries out an automated measurement sequence every 2 or 3 hours, depending on the instrumentation setup. At the beginning of each measurement sequence, the NDIR undergoes a two point calibration with a zero CO2 gas and a high CO2 standard span gas (typically 450-550 micromol/mol), which bracket the range of CO2 mole fractions in seawater and air. The zero CO2 gas is generated by cycling air through a soda lime chamber and silica gel to remove CO2 and water vapour, respectively. The CO2 span gas is prepared by the NOAA Earth Systems Research Laboratory in the USA and calibrated on the WMO X2007 scale with a standard deviation of 0.06 micromol/mol. Each measurement cycle of zero and span gas, equilibrator headspace, and air takes 20 minutes with the equilibrator headspace measurement occurring at about 17 minutes followed by the air measurement. The pressure measurements are considered the same for the equilibrator headspace gas and air measurements due to the design of the MapCO2 system (Sutton et al., 2014) as are the temperature and salinity of the surface seawater and the equilibrator measured by the Seabird SBE16PlusV2.

Tags: 09fs20120208, 09fs20160817, 09fs20161129, 09fs20181119, 09fs20190506, 09fs20191118, 09fs20201114, 09fs20210601, 09fs20211117, 09fs20220509, 09fs20230219, 09fs20231018, 09fs20240422, 09fs20250226, atmospheric pressure, dfco2, equilibrator pressure, equilibrator temperature, fco2_wet_sw, indian ocean, mooring kangaroo_island_35s_136e, mooring_kangaroo_island_35s_136e, moorings and time series, ocean carbon and acidification data system (ocads) project, oceanography, salinity, sea surface temperature, south australian basin, surface measurement, time series, xco2_dry_air, xco2_dry_sw
Organization: National Oceanic and Atmospheric Administration, Department of Commerce