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    • A drop-type CTD, also called an XCTD (eXpendable CTD), measures water temperature and conductivity by dropping a disposable sensor (probe) into the ocean from a vessel underway. Since there is no need to stop the vessel and no time is required to retrieve the sensor, a wide range of observations can be made in a short period of time. Observations can also be made even in very rough weather.

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    • Fig. 6. Schematic diagram of XCTD observation

      XCTDプローブ　XCTD probe