Time response of oxygen optodes on profiling platforms and its dependence on flow speed and temperature.

Bittig, Henry C., Fiedler, Björn, Scholz, Roland, Krahmann, Gerd and Körtzinger, Arne (2014) Time response of oxygen optodes on profiling platforms and its dependence on flow speed and temperature. Limnology and Oceanography: Methods, 12 . pp. 617-636. DOI 10.4319/lom.2014.12.617.

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Abstract

The time response behavior of Aanderaa optodes model 3830, 4330, and 4330F, as well as a Sea-Bird SBE63 optode and a JFE Alec Co. Rinko dissolved oxygen sensor was analyzed both in the laboratory and in the field. The main factor for the time response is the dynamic regime, i.e., the water flow around the sensor that influences the boundary layer’s dynamics. Response times can be drastically reduced if the sensors are pumped. Laboratory experiments under different dynamic conditions showed a close to linear relation between response time and temperature. Application of a diffusion model including a stagnant boundary layer revealed that molecular diffusion determines the temperature behavior, and that the boundary layer thickness was temperature independent. Moreover, field experiments matched the laboratory findings, with the profiling speed and mode of attachment being of prime importance. The time response was characterized for typical deployments on shipboard CTDs, gliders, and floats, and tools are presented to predict the response time as well as to quantify the effect on the data for a given water mass profile. Finally, the problem of inverse filtering optode data to recover some of the information lost by their time response is addressed.

Document Type: Article
Additional Information: WOS:000345344400007
Keywords: DIFFUSION; SENSORS
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence > FO-R10
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > SFB 754
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.4319/lom.2014.12.617
ISSN: 1541-5856
Projects: SOPRAN, SFB754, Future Ocean
Date Deposited: 30 Sep 2014 08:36
Last Modified: 17 Sep 2018 13:20
URI: http://oceanrep.geomar.de/id/eprint/25673

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