Thermal Lag Correction on Slocum CTD Glider Data

In this work a new methodology is proposed to correct the thermal lag error in data from unpumped CTD sensors installed on Slocum gliders. The advantage of the new approach is twofold: first, it takes into account the variable speed of the glider; and second, it can be applied to CTD profiles from a...

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Bibliographic Details
Published inJournal of atmospheric and oceanic technology Vol. 28; no. 9; pp. 1065 - 1071
Main Authors Garau, Bartolomé, Ruiz, Simón, Zhang, Weifeng G, Pascual, Ananda, Heslop, Emma, Kerfoot, John, Tintoré, Joaquín
Format Journal Article
LanguageEnglish
Published Boston American Meteorological Society 01.09.2011
Subjects
Error correction
Error detection
Experiments
Gliders
Heat
Marine
Methodology
Methods
Platforms
Quality control
Salinity
Salinity effects
Sensors
Studies
Variable speed
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Summary:In this work a new methodology is proposed to correct the thermal lag error in data from unpumped CTD sensors installed on Slocum gliders. The advantage of the new approach is twofold: first, it takes into account the variable speed of the glider; and second, it can be applied to CTD profiles from an autonomous platform either with or without a reference cast. The proposed methodology finds values for four correction parameters that minimize the area between two temperature-salinity curves given by two CTD profiles. A field experiment with a Slocum glider and a standard CTD was conducted to test the method. Thermal lag-induced salinity error of about 0.3 psu was found and successfully corrected.
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ISSN:0739-0572
1520-0426
DOI:10.1175/JTECH-D-10-05030.1