In Situ CO2 and O2 Measurements on a Profiling Float
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)...
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| Veröffentlicht in: | Journal of atmospheric and oceanic technology Jg. 30; H. 1; S. 112 - 126 |
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01.01.2013
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| Abstract | 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 high-resolution 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−1. 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. |
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| AbstractList | 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 high-resolution 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−1. 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. |
| Author | Fietzek, Peer Fiedler, Björn Silva, Péricles Körtzinger, Arne Vieira, Nuno Bittig, Henry C. |
| Author_xml | – sequence: 1 givenname: Björn surname: Fiedler fullname: Fiedler, Björn organization: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany – sequence: 2 givenname: Peer surname: Fietzek fullname: Fietzek, Peer organization: GEOMAR Helmholtz Centre for Ocean Research Kiel, and CONTROS Systems & Solutions, Kiel, Germany – sequence: 3 givenname: Nuno surname: Vieira fullname: Vieira, Nuno organization: Instituto Nacional de Desenvolvimento das Pescas, Mindelo, Cape Verde – sequence: 4 givenname: Péricles surname: Silva fullname: Silva, Péricles organization: Instituto Nacional de Desenvolvimento das Pescas, Mindelo, Cape Verde – sequence: 5 givenname: Henry C. surname: Bittig fullname: Bittig, Henry C. organization: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany – sequence: 6 givenname: Arne surname: Körtzinger fullname: Körtzinger, Arne organization: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany |
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