A dynamic flight model for Slocum gliders and implications for turbulence microstructure measurements.
Merckelbach, Lucas, Berger, Anja, Krahmann, Gerd , Dengler, Marcus
and Carpenter, Jeffrey R.
(2019)
A dynamic flight model for Slocum gliders and implications for turbulence microstructure measurements.
Journal of Atmospheric and Oceanic Technology, 36
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pp. 281-296.
DOI 10.1175/JTECH-D-18-0168.1.
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Abstract
The turbulent dissipation rate ɛ is a key parameter to many oceanographic processes. Recently gliders have been increasingly used as a carrier for microstructure sensors. Compared to conventional ship-based methods, glider-based microstructure observations allow for long duration measurements under adverse weather conditions, and at lower costs. The incident water velocity U is an input parameter for the calculation of the dissipation rate. Since U can not be measured using the standard glider sensor setup, the parameter is normally computed from a steady-state glider flight model. As ɛ scales with U2 or U4, depending whether it is computed from temperature or shear microstructure, flight model errors can introduce a significant bias. This study is the first to use measurements of in-situ glider flight, obtained with a profiling Doppler velocity log and an electromagnetic current meter, to test and calibrate a flight model, extended to include inertial terms. Compared to a previously suggested flight model, the calibrated model removes a bias of approximately 1 cm s−1 in the incident water velocity, which translates to roughly a factor of 1.2 in estimates of the dissipation rate. The results further indicate that 90% of the estimates of the dissipation rate from the calibrated model are within a factor of 1.1 and 1.2 for measurements derived from microstructure temperature sensors and shear probes, respectively. We further outline the range of applicability of the flight model.
Document Type: | Article |
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Research affiliation: | OceanRep > SFB 754 > B6 HZG OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography OceanRep > SFB 754 |
Refereed: | Yes |
Open Access Journal?: | No |
DOI etc.: | 10.1175/JTECH-D-18-0168.1 |
ISSN: | 0739-0572 |
Related URLs: | |
Projects: | SFB754, PACES, TRR181 Energy Transfers in Atmosphere and Ocean |
Date Deposited: | 15 Jan 2019 09:00 |
Last Modified: | 08 Feb 2021 07:28 |
URI: | http://oceanrep.geomar.de/id/eprint/45350 |
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