Publication Date:
2022-05-26
Description:
A miniature temperature recorder has been developed to be used with the
hydraulic piston sediment corer 〈HPC) on the Deep Sea Drilling Project
〈DSDP). The instrumentation fits into pressure-sealed slots in the wall of
the HPC, allowing temperature measurements to be made simultaneously with
coring operations. Temperatures from -2 to 70°C are measured to a resolution
of about 0.01°C. Up to 1300 13-bit measurements are recorded in random
access memory (RAM), at a sampling rate ranging between 0.1 s to over 100
min., as specified by the operator in a program loaded into a microprocessor
of the instrument. During recording the instrumentation uses about 3.5 mamp
at 7.5 volts, which can be supplied for about 20 hours of operation by a
custom-made pack of silver-oxide batteries. The corer is normally left
motionless in the sediment for about 10 min. to allow extrapolation of the
measured temperatures to equilibrium in-situ temperature. Examples of data
from DSDP Leg 86 are given.
Description:
Funding was provided by the National Science Foundation
under grant Nos. OCE 82-14658 and OCE 83-00073. Additional
support was provided by U.S. Geological Survey of Woods Hole to begin
development of instrumentation; and to the Ocean Industry Program of the
Woods Hole Oceanographic Institution to complete the development.
Keywords:
Ocean temperature
;
Oceanographic instruments
;
Temperature measurements
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
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