Numerical modelling of the fall-rate behaviour of a free-fall ocean sensor and its validation
| Project/Area Number |
23540506
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Tohoku University |
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Principal Investigator |
HANAWA Kimio 東北大学, 理学(系)研究科(研究院), 教授 (40142921)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | XBT / 降下速度 / 水温計測 / 水温 / 海洋貯熱量 / 海洋温暖化 / 貯熱量 / 落下速度 / 比較実験 / CTD / 粘性 |
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| Research Abstract |
This study attempted to quantify and model the impact of variance in probe weight on the fall-rate of XBT (expendable bathythermograph), which has been a major tool for ocean temperature profiling over the last half a century. Based on a series of direct comparisons, the change of fall-rate of T-7, the most popularly-used probe type, caused by a change of 10g in its probe weight is estimated to be about 1%. This is almost equal to the relative weight change. When this is applied to the manufacturers' weight tolerance in their QC, the influence of weight change on the fall-rate is reasonably confined, and the results of this study give some upper limit on the XBT fall-rate bias, which has been a matter of debate over the last decade for the improvement of the historical ocean temperature data archive.
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Report
(4 results)
Research Products
(14 results)
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[Journal Article] A review of global ocean temperature observations: Implications for ocean heat content estimates and climate change.2013
Author(s)
Abraham, M., Baringer, N. Bindoff, T. Boyer, L. Cheng, J. Church, J. Conroy, C. Domingues, J. Fasullo, J. Gilson, G. Goni, S. Good, J. Gorman, V. Gouretski, M. Ishii, G. Johnson, S. Kizu, J. Lyman 他
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Journal Title
Rev. Geophys.
Volume: 51
Issue: 3
Pages: 450-483
DOI
Related Report
Peer Reviewed
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