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A Correction for the Thermal Mass-Induced Errors of CTD Tags Mounted on Marine Mammals

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Title: A Correction for the Thermal Mass-Induced Errors of CTD Tags Mounted on Marine Mammals
Authors: Mensah, Vigan Browse this author
Roquet, Fabien Browse this author
Siegelman-Charbit, Lia Browse this author
Picard, Baptiste Browse this author
Pauthenet, Etienne Browse this author
Guinet, Christophe Browse this author
Keywords: Data processing
In situ oceanic observations
Issue Date: Jun-2018
Publisher: American Meteorological Society
Journal Title: Journal of atmospheric and oceanic technology
Volume: 35
Issue: 6
Start Page: 1237
End Page: 1252
Publisher DOI: 10.1175/JTECH-D-17-0141.1
Abstract: The effect of thermal mass on the salinity estimate from conductivity-temperature-depth (CTD) tags sensor mounted on marine mammals is documented, and a correction scheme is proposed to mitigate its impact. The algorithm developed here allows for a direct correction of the salinity data, rather than a correction of the sample's conductivity and temperature. The amplitude of the thermal mass-induced error on salinity and its correction are evaluated via comparison between data from CTD tags and from Sea-Bird Scientific CTD used as a reference. Thermal mass error on salinity appears to be generally O(10(-2)) g kg(-1), it may reach O(10(-1)) g kg(-1), and it tends to increase together with the magnitude of the cumulated temperature gradient (T-HP) within the water column. The correction we propose yields an error decrease of up to similar to 60% if correction coefficients specific to a certain tag or environment are calculated, and up to 50% if a default value for the coefficients is provided. The correction with the default coefficients was also evaluated using over 22 000 in situ dive data from five tags deployed in the Southern Ocean and is found to yield significant and systematic improvements on the salinity data, including for profiles whose T-HP was weak and the error small. The correction proposed here yields substantial improvements in the density estimates, although a thermal mass-induced error in temperature measurements exists for very large T-HP and has yet to be corrected.
Rights: © Copyright 2018 American Meteorological Society (AMS).
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: MENSAH Vigan

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