APPENDIX IV
ALVIN dives 2941 and 2944, Recovery of thermocouple/thermistor array package
(Meg Tivey and Al Bradley (WHOI))
- Two instruments, each with 2 working pods, were deployed in summer, 1994
at the Monolith and Table Vent sites, Cleft Segment (JFR), and were recovered
June 27 & 30, 1995.
- Approach produced continual records of fluid temperatures, recorded once
per minute, at 18 to 20 discrete points in each of 4 areas (2 of high temperature
and 2 of low temperature diffuse flow).
- A chimney grew inside the stainless steel ring and through the thermocouple
array at Monolith. Data recorded during the first 16 days provide an account
of wall temperature during growth of the chimney.
- (Unfortunately by the end of the 16th day the inconel-sheathed thermocouples
had corroded; titanium-sheathed thermocouples will be used in the future).
- The 5.5 month records of temperatures associated with the other 3 sites
are being examined.
- Deployment and recovery of the instrument packages went relatively smoothly,
owing in large part to working out strategy with the ALVIN group during
instrument development and prior to each cruise.
- An inductively coupled link was used during instrument deployment in 1994
to interrogate the instruments to make sure they were working properly once
deployed.
- Results will be presented on Thursday in Session S41B, Geology and Geophysics
of the Juan de Fuca Ridge I Posters.