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Other research product . 2020

Near-Automatic Routine Field Calibration/Correction of Glider Salinity Data Using Whitespace Maximization Image Analysis of Theta/S Data.

Allen, John T.; Munoz, Cristian; Gardiner, Jim; Reeve, Krissy A.; Alou-Font, Eva; Zarokanellos, Nikolaos;
Open Access
Published: 01 Jan 2020

Glider vehicles are now perhaps some of the most prolific providers of real-time and near-real-time operational oceanographic data. However, the data from these vehicles can and should be considered to have a long-term legacy value capable of playing a critical role in understanding and separating inter-annual, inter-decadal, and longterm global change. To achieve this, we have to go further than simply assuming the manufacturer’s calibrations, and field correct glider data in a more traditional way, for example, by careful comparison to water bottle calibrated lowered CTD datasets and/or “gold” standard recent climatologies. In this manuscript, we bring into the 21st century a historical technique that has been used manually by oceanographers for many years/decades for field correction/inter-calibration, thermal lag correction, and adjustment for biological fouling. The technique has now been made semi-automatic for machine processing of oceanographic glider data, although its future and indeed its origins have far wider scope. The subject of this manuscript is drawn from the original Description of Work (DoW) for a key task in the recently completed JERICO-NEXT (Joint European Research Infrastructure network for Coastal Observatories) EU-funded program, but goes on to consider future application and the suitability for integration with machine learning. Refereed 14.A Sea surface salinity Subsurface salinity TRL 8 Actual system completed and "mission qualified" through test and demonstration in an operational environment (ground or space) Manual (incl. handbook, guide, cookbook etc) Standard Operating Procedure 2019-12-03


Gliders, Image analysis, Field correction, Semi automatic machine processing, :Physical oceanography::Water column temperature and salinity [Parameter Discipline], :Data processing [Data Management Practices], :Data acquisition [Data Management Practices]

18 references, page 1 of 2

Allen, J., Dunning, J., Cornell, V., Moore, M., and Crisp, N. (2002). Operational oceanography using the 'new' SeaSoar ocean undulator. Sea Technol. 43, 35-40.

Baumgartner, M. F., Stafford, K. M., Winsor, P., Statscewich, H., and Fratantoni, D. M. (2014). Glider-based passive acoustic monitoring in the arctic. Mar. Technol. Soc. J. 48, 40-51. doi: 10.4031/mtsj. 48.5.2

Bosse, A., Testor, P., Mortier, L., Prieur, L., Taillandier, V., d'Ortenzio, F., et al. (2015). Spreading of levantine intermediate waters by submesoscale coherent vortices in the northwestern Mediterranean Sea as observed with gliders. J. Geophys. Res. Oceans 120, 1599-1622. doi: 10.1002/2014jc0 10263 [OpenAIRE]

Durack, P., and Wijffels, S. (2010). Fifty-year trends in global ocean salinities and their relationship to broadscale warming. J. Clim. 23, 4342-4362. doi: 10.1175/ 2010JCLI3377.1

EGO Gliders Data Management Team (2017). EGO Gliders NetCDF Format Reference Manual, eds T. Carval, C. Gourcuff, J.-P. Rannou, J. J. H. Buck, and B. Garau, Paris: Ifremer. doi: 10.13155/34980

Fer, I., Peterson, A. K., and Ullgren, J. (2014). Microstructure measurements from an underwater glider in the turbulent faroe bank channel overflow. J. Atmos. Oceanic Technol. 31, 1128-1150. doi: 10.1175/JTECH-D-13- 00221.1

Gregor, L., Ryan-Keogh, T. J., Nicholson, S.-A., du Plessis, M., Giddy, I., and Swart, S. (2019). GliderTools: a python toolbox for processing underwater glider data. Front. Mar. Sci. 6:738. doi: 10.3389/fmars.2019. 00738

King, B. A., Firing, E., and Joyce, T. M. (2001). “Chapter 3.1 Shipboard observations during WOCE,” in International Geophysics, Vol. 77, eds G. Siedler, J. Church, and J. Gould (Cambridge, MA: Academic Press), 99-122. doi: 10.1016/S0074- 6142(01)80114-5

Langdon, C. (2010). “Determination of dissolved oxygen in seawater by Winkler titration using the amperometric technique,” in GO_SHIP Repeat Hydrography Manual: A Collection of Expert Reports and Guidelines, eds B. M. Sloyan and C. Sabine (Paris: IOC/ IOCCP).

Owens, W. B., and Wong, A. P. S. (2009). An improved calibration method for the drift of the conductivity sensor on autonomous CTD profiling floats by theta-S climatology. Deep Sea Res. Part I Oceanogr. Res. Pap. 56, 450-457. doi: 10.1016/j.dsr.2008.09.008

Funded by
Joint European Research Infrastructure network for Coastal Observatory – Novel European eXpertise for coastal observaTories
  • Funder: European Commission (EC)
  • Project Code: 654410
  • Funding stream: H2020 | RIA
Related to Research communities
European Marine Science