A New Fall-Rate Equation for T-5 Expendable Bathythermograph (XBT) by TSK |
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| Authors: | Kizu Shoichi Yoritaka Hiroyuki Hanawa Kimio |
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| Institution: | (1) Department of Geophysics, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan;(2) Japan Coast Guard Academy, 5-1 Wakaba-cho, Kure, 737-8512, Japan |
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| Abstract: | The accuracy of the manufacturer’s fall-rate equation for the T-5 Model of expendable bathythermograph (XBT) has been investigated based on about 300 collocated pairs of XBT-CTD (Conductivity-Temperature-Depth profiler) measurements in various climatological regions. We found that the equation systematically overestimates depth by about 5% for the T-5 produced by Tsurumi Seiki, Co. Ltd. (TSK), but almost no bias is associated with the T-5 produced by Sippican, Inc., in USA. The cause of this difference is not clear, because the two manufacturers’ T-5 probes are reported to have identical shape and weight in water. We propose a new fall-rate equation for the TSK T-5: z(t) = 6.54071t - 0.0018691t
2, where z(t) is depth in meters at time, t, in seconds. |
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| Keywords: | T-5 XBT expendable bathythermograph fall-rate equation temperature measurement VOS monitoring |
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