In situ CO2 and O2 measurements on a profiling float.

Fiedler, Björn, Fietzek, Peer, Vieira, Nuno, Silva, Péricles, Bittig, Henry C. and Körtzinger, Arne (2013) In situ CO2 and O2 measurements on a profiling float. Open Access Journal of Atmospheric and Oceanic Technology, 30 . pp. 112-126. DOI 10.1175/JTECH-D-12-00043.1.

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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 high resolution measurements in the surface ocean layer. Four consecutive deployments were carried out during Nov. 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. In order 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 float-borne pCO2 measurements were greatly improved (10 – 15 μatm for 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.

Document Type: Article
Keywords: Cape Verde; Buoy observations, In situ atmospheric observations, In situ oceanic observations, Instrumentation/sensors, Profilers, oceanic, Surface observations
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R10
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1175/JTECH-D-12-00043.1
ISSN: 0739-0572
Projects: CVOO, SOPRAN, Future Ocean
Date Deposited: 29 Oct 2012 11:01
Last Modified: 23 Sep 2019 20:25

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