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Fiedler, Björn; Fietzek, Peer; Vieira, Nuno; Silva, Pericles; Bittig, Henry; Körtzinger, Arne (2013): Processed CO2/O2 Float data from 4 deployments near Cape Verde Island (11/2010 - 06/2011). PANGAEA,, Supplement to: Fiedler, B et al. (2013): In Situ CO2 and O2 Measurements on a Profiling Float. Journal of Atmospheric and Oceanic Technology, 30(1), 112-126,

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In recent years, profiling floats, which form the basis of the successful international Argo observatory, are also being considered as platforms for marine biogeochemical research. This study showcases the utility of floats as a novel tool for combined gas measurements of CO2 partial pressure (pCO2) and O2. These float prototypes were equipped with a small-sized and submersible pCO2 sensor and an optode O2 sensor for highresolution measurements in the surface ocean layer. Four consecutive deployments were carried out during November 2010 and June 2011 near the Cape Verde Ocean Observatory (CVOO) in the eastern tropical North Atlantic. The profiling float performed upcasts every 31 h while measuring pCO2, O2, salinity, temperature, and hydrostatic pressure in the upper 200 m of the water column. To maintain accuracy, regular pCO2 sensor zeroings at depth and surface, as well as optode measurements in air, were performed for each profile. Through the application of data processing procedures (e.g., time-lag correction), accuracies of floatborne pCO2 measurements were greatly improved (10-15 µatm for the water column and 5 µatm for surface measurements). O2 measurements yielded an accuracy of 2 µmol/kg. First results of this pilot study show the possibility of using profiling floats as a platform for detailed and unattended observations of the marine carbon and oxygen cycle dynamics.
Median Latitude: 17.813027 * Median Longitude: -25.172036 * South-bound Latitude: 16.329700 * West-bound Longitude: -27.799700 * North-bound Latitude: 19.698000 * East-bound Longitude: -23.631900
Date/Time Start: 2010-11-10T23:44:15 * Date/Time End: 2011-06-10T09:50:08
Minimum DEPTH, water: 0.70 m * Maximum DEPTH, water: 198.35 m
deployment_d4 * Latitude: 17.078600 * Longitude: -24.588300 * Date/Time: 2010-11-10T23:44:00 * Elevation: -197.0 m * Location: off Cape Verde Islands * Campaign: CVOO Floater * Method/Device: Nemo float (NFLOAT)
deployment_d5 * Latitude: 17.019600 * Longitude: -24.500500 * Date/Time: 2011-01-30T22:46:00 * Elevation: -197.6 m * Location: off Cape Verde Islands * Campaign: CVOO Floater * Method/Device: Nemo float (NFLOAT)
deployment_d6 * Latitude: 17.407800 * Longitude: -24.539100 * Date/Time: 2011-03-20T21:41:00 * Elevation: -198.1 m * Location: off Cape Verde Islands * Campaign: CVOO Floater * Method/Device: Nemo float (NFLOAT)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventFiedler, Björn
2ProfileProfileFiedler, Björn
3DATE/TIMEDate/TimeFiedler, BjörnGeocode
4LATITUDELatitudeFiedler, BjörnGeocode
5LONGITUDELongitudeFiedler, BjörnGeocode
6DEPTH, waterDepth watermFiedler, BjörnGeocode
7Pressure, waterPressdbarFiedler, Björn
8Temperature, waterTemp°CFiedler, Björn
9SalinitySalFiedler, Björn
10Carbon dioxide, partial pressurepCO2µatmFiedler, Björn
11Carbon dioxide, partial pressurepCO2µatmFiedler, Björntime-lag corrected
12OxygenOXYGENµmol/kgFiedler, Björn
13OxygenOXYGENµmol/kgFiedler, Björntime-lag corrected
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