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Accession Number:
ADA455275
Title:
HRP II - The Development of a New Vehicle for Studying Deep Ocean Mixing
Descriptive Note:
Technical rept.
Corporate Author:
WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF PHYSICAL OCEANOGRAPHY
Report Date:
2006-02-01
Pagination or Media Count:
35.0
Abstract:
A new deep ocean capable profiling vehicle was developed at WHOI during 2002-2003. It was modeled after the High Resolution Profiler HRP, a robust data acquisition system for studying mixing in the deep ocean. The new vehicle was dubbed HRP-II. The new instrument is a free vehicle, like its predecessor. It collects data from configured sensors while falling freely through the ocean after deployment. Not being connected to the ship by a cable removes heave, drift and other motions that would contaminate the data collected. The HRP-II uses ballast weights to descend, which are jettisoned at the end of a dive, then excess buoyancy in the body returns it to the surface where it is recovered. Normally data is only collected on the downcast, but the new profiler is capable of logging during segments of the ascent. The sensors measure temperature, conductivity and velocity on a variety of vertical scales, along with descriptors of the vehicle bodys orientation in the water. Analyzed together, the data quantifies all scales of ocean mixing. Contemporary components and hardware were employed, enhancing maintainability of the vehicle in the future. The sensor systems selected are highly accurate, and sample at precisely timed intervals. The logger program on HRP-II stores data acquired by all configured sensors simultaneously. Instrument configuration is flexible and extensible. All the data is logged to memory during the dive and transferred to the disk after the weights are released. Files created during a profile are downloaded using FTP protocols to a shipboard computer after recovery. The HRP-II was successfully deployed during a test cruise in January 2004.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
