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Today we plan to recover all the equipment
that was left during Leg 2 as part of the Guaymas Instrumented Vent
Experiment (GIVE). Today our thoughts are more like, “GIVE ME BACK MY
INSTRUMENTS!” There are nine different instrument packages distributed
at four vent sites. These packages include three thermocouple
arrays, hopefully with some quantity of attached sulfide. Each thermocouple
array has its own datalogger with a detachable ICL
that connects it to the array. There are also three OsmoSamplers with an
attached HOBO temperature recorder and long inlet snorkel. Each of the
four vent sites is marked with an acoustic beacon that must also be
recovered. The four sites are separated by less than 700 meters of mud,
vents, and animal communities. The acoustic beacons will guide us to the
general area, but we will need to review the framegrabs from last March to
remind ourselves of the landmarks. The most-northern site is a new,
hydrocarbon-rich, low-temperature site found and named by us because it
looked like a hydrothermal “Theme Park.”
The most-southern site, Toadstool, is similarly venting clear, diffusive
fluid. However, the two sites in the middle, Rebecca’s
Roost and Busted Mushroom, are large, high-temperature structures.
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Theme Park, there was only a stream of
diffusive flow through the frame (see above). At Toadstool, a small
chimney re-grew overnight at the array site and had to be removed before
deploying the array (see 3/7 image).
The OsmoSampler was placed nearby Over the past month, Meg
Tivey and I have discussed many different possible recovery
strategies. We have worked out a plan to accumulate the items and fill the
ROV drawer and front porch twice, on two separate short div
Data from the Busted Mushroom site is
already available! |