NeMO July 20, 2001

Logbook: July 20, 2001

Brown: 24-hr dive yields record number of samples.
Wecoma: No report today.
Teacher logbooks: Capturing bacteria.
Perspective today: Kevin Roe, Chemical Oceanographer

Science News | Teacher At Sea | Participant Perspective

Cruise Calendar

July-August 2001

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Science News

NOAA Ship Ron Brown - ROV Cruise

image of suction sampler and tubeworm grab, click for full story

Suction sampler on left, arm grabbing tubeworms on right.

ROPOS is in the middle of another long dive (623) which is visiting sites both inside and outside the caldera with a pressure sensor. The pressure sensor precisely measures the depth at an array of points on the seafloor to see if the center of the caldera is going up or down...
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R/V Wecoma - CTD Cruise

Hydrothermal plumes lurk below us, hidden by a mile of restless sea. How do we gain a vision of those dilute discharges in their dark world? We use two types of operations to map and sample hydrothermal plumes. The simplest one is called a vertical cast. More...

Teacher Logbooks

NOAA Ship Ron Brown - Jeff Goodrich

image of bacterial traps, click for full story

Plop-Bacterial traps!

Plop. Another bac-trap in the bio-box. Nice shot Big Keith! (photo left) Microbial communities abound and form the base of the food chain at hydrothermal vents. Microbiologists Craig Moyer and Jeff Engebretson capture these critters in special plexiglas containers with 200-micron nitex screens. They are designed to be placed over relatively cool diffuse vents and transmit hydrothermal fluid through them. More...

R/V Wecoma - Missy Holzer

Where to go, when to go, what to bring are just a few pieces of the picture in planning for a research cruise. It is up to the leadership and guidance of the chief scientist to plan the cruise so it's successful in meeting its objectives, otherwise a tremendous amount of quality data, time, and money are wasted.
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Participant Perspective

Interview with Kevin Roe
Chemical Oceanographer, NOAA/U. Washington

Jeff: What are you sampling at Axial Volcano's hydrothermal vents?

Kevin: I'm looking at the dissolved chemistry. One of the most important is sulfide. We just put a new sulfide sensor on the hot fluid sampler. It's going to be nice to have a probe down there because sulfide decays with time. There's a little lag time between when the samples come up and when I get at them so I've got to get on them right away. Other chemicals we're trying to measure decay too. Back in the lab in Seattle I do metals and other trace elements. I believe we'll get more accurate results with the probe.

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