Pressure response of Aanderaa and Sea-Bird oxygen optodes.

Bittig, Henry C., Fiedler, Björn, Fietzek, Peer and Körtzinger, Arne (2015) Pressure response of Aanderaa and Sea-Bird oxygen optodes. Open Access Journal of Atmospheric and Oceanic Technology, 32 . pp. 2305-2317. DOI 10.1175/JTECH-D-15-0108.1.

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We investigated the effect of hydrostatic pressure of up to 6000 dbar on Aanderaa and Sea-Bird oxygen optodes both in the laboratory and in the field. The overall pressure response is a reduction in the O2 reading by 3 – 4 % per 1000 dbar which is closely linear with pressure and increases with temperature. Closer inspection reveals two superimposed processes with opposite effect: an O2-independent pressure response on the luminophore which increases optode O2 readings and an O2-dependent change in luminescence quenching which decreases optode O2 readings. The latter process dominates and is mainly due to a shift in the equilibrium between sensing membrane and sea water under elevated pressures. If only the dominant O2-dependent process is considered, Aanderaa and Sea-Bird optodes differ in their pressure response. Compensation of the O2-independent process, however, yields a uniform O2 dependence for Aanderaa optodes with standard foil and fast-response foil as well as Sea-Bird optodes. A new scheme to calculate optode O2 from raw data is proposed to account for the two processes. The overall uncertainty of the optode pressure correction amounts to 0.3 % per 1000 dbar, mainly due to variability between sensors.

Document Type: Article
Additional Information: WOS:000366989300004
Keywords: Physical Meteorology and Climatology, Chemistry, oceanic, Observational techniques and algorithms, Algorithms, Data quality control, In situ oceanic observations, Instrumentation/sensors
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > SFB 754 > A4
OceanRep > The Future Ocean - Cluster of Excellence > FO-R10
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1175/JTECH-D-15-0108.1
ISSN: 0739-0572
Projects: SFB754, O2-Floats, SPACE, E-AIMS, SOPRAN, HGF-CV-Station, Future Ocean
Date Deposited: 21 Dec 2015 09:58
Last Modified: 04 Aug 2020 09:24

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