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Field Notes 2003

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Here’s Mike about to drop an XCP (eXpendable Current Profiler) in a lead. These measure the change of ocean currents from the surface to the ocean bottom. They were invented at the Applied Physics Laboratory, and are now manufactured by Sippican, Inc. of Marion, Massachusetts. Once dropped in the water, the XCP floats for about 30 seconds, then it releases a smaller torpedo-shaped sensor that sinks through the water while sending data back up through a very thin wire to the antenna in the floating unit. It’s a single-use instrument, i.e., an expendable.

Polar Science Center
Applied Physics Laboratory
1013 NE 40th Street
Seattle, WA 98105

University of Washington

This material is based upon work supported by the National Science Foundation under Grant No. 0230427.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the
National Science Foundation.

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