Recorder-Dependent Temperature Error of Expendable Bathythermograph |
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| Authors: | Shoichi Kizu Kimio Hanawa |
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| Institution: | (1) Department of Geophysics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan |
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| Abstract: | The accuracy of temperature measurement by the expendable bathythermograph (XBT) is examined for five types of recorders by
comparison with co-located CTD measurements and statistical analysis of temperature profiles including an isothermal layer.
A positive temperature error increasing downward is occasionally detected for two types of Japanese recorder which have been
commonly used among Japanese oceanographic institutions and marine observatories. This error resembles to that reported by
Bailey et al. (1989) and Wright (1991) for a different type of recorders, although its cause is not clearly understood. The irregular
occurrence of the error suggests that the problem is not solely due to the recorders but rather by some inconsistency of the
whole measuring system including them, an XBT probe and sea water. The error is estimated to increase at a rate of O (0.1°C/100 m), and it could be close to 1°C at the deepest part of the profiles (760 m for Tsurumi T-7).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Expendable bathythermograph XBT temperature measurement VOS monitoring |
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