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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-128
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-128
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: technical note 04 May 2020

Submitted as: technical note | 04 May 2020

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This preprint is currently under review for the journal BG.

Technical note: Seamless gas measurements across Land-Ocean Aquatic Continuum – corrections and evaluation of sensor data for CO2, CH4 and O2 from field deployments in contrasting environments

Anna Canning1,2,a, Arne Körtzinger1,3, Peer Fietzek4, and Gregor Rehder5 Anna Canning et al.
  • 1GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Schleswig-Holstein, Germany
  • 2-4H-JENA engineering GmbH, Jena, Germany
  • 3Christian-Albrechts-Universität zu Kiel, Kiel, Schleswig-Holstein, Germany
  • 4Kongsberg Maritime GmbH, Hamburg, Germany
  • 5Leibniz Institute for Baltic Sea Research Warnemünde, Rostock-Warnemünde, Germany
  • aformerly at: Kongsberg Maritime Contros GmbH, Kiel, Germany

Abstract. Comparatively the ocean and inland waters are two separate worlds, with concentrations in greenhouse gases having orders of magnitude in difference between the two. Together they create the Land-Ocean Aquatic Continuum (LOAC), which comprises itself largely of areas with little to no data in regards to understanding the global carbon system. Reasons for this include remote and inaccessible sample locations, often tedious methods that require collection of water samples and subsequent analysis in the lab, as well as the complex interplay of biological, physical and chemical processes. This has led to large inconsistencies, increasing errors and inevitably leading to potentially false upscaling. Here we demonstrate successful deployment in oceanic to remote inland regions, over extreme concentration ranges with multiple pre-existing oceanographic sensors combined set-up, allowing for highly detailed and accurate measurements. The set-up consists of sensors measuring pCO2, pCH4 (both flow-through, membrane-based NDIR or TDLAS sensors), O2, and a thermosalinograph at high-resolution from the same water source simultaneously. The flexibility of the system allowed deployment from freshwater to open ocean conditions on varying vessel sizes, where we managed to capture day-night cycles, repeat transects and also delineate small scale variability. Our work demonstrates the need for increased spatiotemporal monitoring, and shows a way to homogenize methods and data streams in the ocean and limnic realms.

Anna Canning et al.

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Anna Canning et al.

Anna Canning et al.

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Latest update: 03 Jun 2020
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Short summary
The manuscript describes a novel, fully autonomous, multi-gas flow-through setup for multiple gases that combines established high-quality oceanographic sensors in a small and robust system, designed to use across all salinities from all types of platforms. We describe the system and its performance in all relevant detail, including corrections, which improve the accuracy of these sensors. Illustrating how simultaneous multi-gas set up can provide extremely high spatiotemporal resolution.
The manuscript describes a novel, fully autonomous, multi-gas flow-through setup for multiple...
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