Going down… cups sent to the bottom

Cat Nichols and her cups ready for the CTD.

Andrew Taylor and Jon Wokuluk working on their cups!
Still sampling!   Today was the 42nd anniversary of the launching of the R/V Melville.  At dinner the cook’s had made an amazing ship-shape cake!  We sang happy birthday and enjoyed dinner!  Chief Engineer Paul Bueren’s BBQed steaks!   We got more pyrosomes and Dragon fish in the MOCNESS tonight.  The moon was out and it looked a little spooky with the clouds and the big swells.  Everyone is excitedly working on their styrofoam cups as tomorrow is the big day for the deepest CTD cast of the cruise.  The cast will go down to 1000m and the pressure at that depth will crush the air out of the Styrofoam cups, shrinking them.  You have to see it to appreciate it.  I have my students make cups at the beginning of every year and then send them out to the research  ship R/V Revelle and they go down on the CTD cast to be shrunk.  It is a wonderful lesson in pressure.

Some of the shrunken wig heads from previous cruises.

These are some of the shrunken wig heads from previous cruises.  As you can see the “shrinkage"  pressure is pretty impressive.  The atmospheric pressure at sea level is 15 lbs per square inch and each 33 feet of depth equals 1 Atmosphere of pressure.  So 33 feet below the surface of the ocean is 2 Atmospheres of pressure. So how many atmospheres and how much pressure would 1000 m ( about 3000 feet) deep in the ocean be?  I will send picture of our shrunken cups tomorrow.
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