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Development of a Bottom Following RAFOS float

Development of a Bottom Following RAFOS float. Mark Prater Dave Hebert URI. RAFOS Float. Standard version: Isobaric (glass pipe has a much smaller compressibility and thermal expansion coefficient than seawater). Isopycnal version:

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Development of a Bottom Following RAFOS float

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  1. Development of a Bottom Following RAFOS float Mark Prater Dave Hebert URI

  2. RAFOS Float Standard version: Isobaric (glass pipe has a much smaller compressibility and thermal expansion coefficient than seawater) Isopycnal version: A compressee (drop weight modified to contain a piston and spring) is used to match the float compressibility to that of the seawater in which the float would be deployed. There are two basic versions: f/h version - a volume change (vocha) added to allow the volume (density) of the float to be changed.

  3. Temperature section along the Faroe Bank To follow the plume, we need a float that is neither isobaric and isopycnal but follows the bottom.

  4. Prototype bottom-following RAFOS float The first attempt to keep the RAFOS float a predetermined height off the bottom using a passive system. A thin wire hung below the drop weight and dragged along the bottom. As the plume descends, the in-situ density increases. The RAFOS would normally stay at a constant pressure. However, as the float moves away from the bottom, some of the wire is lifted off the bottom and the float becomes heavier (denser).

  5. Example of a deployment

  6. Standard Mission • What should the float measure? • Should the profile throughout the boundary layer? • What products would best help constrain the models?

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