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. Open Access Journal of Atmospheric and Oceanic Technology, 36 . pp. 281-296. DOI 10.1175/JTECH-D-18-0168.1.

[img]
Preview
Text
jtech-d-18-0168.1.pdf - Accepted Version
Available under License Creative Commons: Attribution 4.0.

Download (3466Kb) | Preview
[img] Text
jtech-d-18-0168.1.pdf - Published Version
Restricted to Registered users only until March 2020.

Download (2084Kb)

Supplementary data:

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
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: 04 Mar 2019 12:17
URI: http://oceanrep.geomar.de/id/eprint/45350

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...