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.
Original language | English |
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Pages (from-to) | 905-912 |
Number of pages | 8 |
Journal | Journal of Oceanography |
Volume | 61 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2005 Oct |
Keywords
- Expendable bathythermograph
- Fall-rate equation
- T-5
- Temperature measurement
- Time-depth conversion equation
- VOS monitoring
- Water viscosity
- XBT
ASJC Scopus subject areas
- Oceanography