Inter-manufacturer Difference and Temperature Dependency of the Fall-Rate of T-5 Expendable Bathythermograph |
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| Authors: | Email author" target="_blank">Shoichi?KizuEmail author Shin-Ichi?Ito Tomowo?Watanabe |
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| Institution: | (1) Department of Geophysics, Graduate School of Science, Tohoku University, Aza Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan;(2) Tohoku National Fisheries Research Institute, Shinhama-cho, Shiogama, Miyagi 985-0001, Japan;(3) National Research Institute for Far Seas Fisheries, Shimizu Orido, Shizuoka 424-8633, Japan |
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| Abstract: | The fall-rate of the T-5 expendable bathythermograph (XBT) produced by Tsurumi Seiki (TSK) Co., Ltd and that by Sippican Inc.,
are intercompared by a series of contemporaneous and colocated measurements with conductivity-temperature-depth (CTD) profilers.
It is confirmed that the fall-rates of the two manufacturers' T-5 differ by about 5 percent, despite the fact that they had
been believed to be identical for many years. The cause of the difference is discussed on the basis of a detailed cross-examination
of the two T-5 models. It is found for the first time that the two models are different in several respects. The manufacturer's
fall-rate equation is only applicable to the Sippican T-5, for which Boyd and Linzell's (1993) equation seems to be slightly
more accurate. Kizu et al.'s (2005) equation gives a clearly less biased depth than the manufacturers' equation for the TSK T-5. It is also found that
the fall-rates of both T-5 models are dependent on water temperature, perhaps because of viscosity. The temperature-dependency
of the fall-rate of the TSK T-5 is larger than that of the Sippican T-5. |
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| Keywords: | T-5 XBT expendable bathythermograph fall-rate equation time-depth conversion equation temperature measurement VOS monitoring water viscosity |
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