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Ocean Science An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/os-2020-52
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2020-52
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  12 Aug 2020

12 Aug 2020

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A revised version of this preprint was accepted for the journal OS and is expected to appear here in due course.

Glider-Based Observations of CO2 in the Labrador Sea

Nicolai von Oppeln-Bronikowski1, Brad de Young1, Dariia Atamanchuk2, and Douglas Wallace2 Nicolai von Oppeln-Bronikowski et al.
  • 1Department of Physics and Physical Oceanography, Memorial University, 283 Prince Phillip Drive, St. John's, NL, A1B3X7, Canada
  • 2Department of Oceanography, Dalhousie University, 1355 Oxford Street, Halifax, NS, B3H4R2, Canada

Abstract. Ocean gliders can provide high spatial and temporal resolution data and target specific ocean regions at a low cost compared to ship-based measurements. An important gap, however, given the need for carbon measurements, is the lack of capable sensors capable for glider-based CO2 measurements. We need to develop robust methods to evaluate novel CO2 sensors for gliders. Here we present results from testing the performance of a novel CO2 optode sensor (Atamanchuk et al., 2014), deployed on a Slocum glider, in the Labrador Sea and on the Newfoundland Shelf. We demonstrate our concept of validating data from this novel sensor during a long glider deployment using a secondary autonomous observing platform – the SeaCycler. Comparing data between different sensors and observing platforms can improve data quality and identify problems such as sensor drift. SeaCycler carried an extensively tested gas analyzer: the Pro-Oceanus's CO2-Pro CV, as part of its instrument float. The CO2-Pro CV has shown stable performance during lengthy observations (e.g. Jiang et al., 2014), but has a slow response time for continuous profiling, and its power consumption is not affordable for glider operations. This CO2 optode is an early prototype sensor that has not undergone rigorous testing on a glider, but is compact and uses little power. This paper summarizes the test results for this sensor on a Slocum glider. We capture the performance of the sensor, and for the Labrador Sea mission, comparing the glider data against the SeaCycler's measurements to compute an in-situ correction for the optode. We use the referenced data set to investigate trends in spatial and temporal variability captured by the glider data, pointing to short time and distances scales as drivers of change in this region.

Nicolai von Oppeln-Bronikowski et al.

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Nicolai von Oppeln-Bronikowski et al.

Nicolai von Oppeln-Bronikowski et al.

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Latest update: 30 Nov 2020
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Short summary
This paper describes challenges around direct measurement of CO2 in the ocean using ocean gliders. We discuss our method of using multiple sensor platforms as test beds for carrying out observing experiments and highlight the implications of our study on future glider missions. We also show high-resolution measurements and discuss challenges and lessons learned in the context of future ocean gas measurements.
This paper describes challenges around direct measurement of CO2 in the ocean using ocean...
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