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Logbook
June 18, 1999

Contents:

• News from Wecoma
• Participant Perspective
• Logbook from Teacher at Sea
• Question/Answer from shore to sea

Friday was devoted to mooring recovery, collecting all 9 moorings in about 12 hrs--quite a busy day! All equipment was recovered successfully. Moorings at Sonne showed heavy corrosion and Fe encrustation. One of the screws holding the LSS bracket to a MAPR pressure case was corroded to the size of a pin.

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Not available today.

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Day 3 Friday 6/18/99

We were successful - all 9 moorings placed last year, we retrieved in record time!

The moorings had a variety of instruments attached to each line. Miniature Temperature Recorders (MTR) on each line with other lines having Nephelometer (Light Scanning Sensor or LSS) which sends light out and then measures the light reflected from particles. These data tell the scientists the number of particles in the tested water sample. Over the year of collection the LSS gives a data record of the particles that are in the hydrothermal plume or nearby. It is amazing we can read and compare this information - computers are a tremendous advantage for science today.

Current meters were attached to three of the moorings retrieved. They will tell us how fast and in what direction the water moves in the vicinity of the Axial Volcano. The data will be added to the accumulated surveys to be studied.

The weather today has been comfortable - about 56 degrees. Swell height is 3-4 ft. with winds of 15 knots.

We spotted whale blows off the starboard side (right) mid-day. These are most likely Blue Whales judging from the height of the blow. In addition to this we saw three Albatross (sea bird) circling the ship at various times during the afternoon. Our first ship sighting after three day's was a container ship that passed off our bow.

It was a busy day on the deck bringing on all the moorings deployed last year. It involved everyone's support and help. Seeing scientists as well as crew members working together builds camaraderie for a successful cruise here on the Juan de Fuca Ridge.

Tomorrow we will be putting out a "tow-yo". Join us to see what this is ... - it will be interesting!

Fair seas,
Ms Deck

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