Date: Sun, 9 Mar 1997 17:46:50 +0000 (GMT)
From: Jason Goodman <sci5@knorr.whoi.edu>
To: seadiary@MIT.EDU
Subject: March 9
Message-Id: <Pine.SUN.3.91.970309172549.4457D-100000@mike.knorr.whoi.edu>
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56 34' N, 54 39' W
Temp: -9 C, Winds: still broken
Seas: not bad

  We're in the central part of the Labrador Sea gyre, doing a tow-yo
survey.  I explained tow-yoing before: to recap, we do CTD casts while
steaming, so the instrument zig-zags up and down through the water.  We
found evidence of convection forming a deep mixed layer (a column of water
a mile thick whose temp varies less than .05 C throughout.) at the start
of the tow-yo section.  As we moved away from the center, we saw warm,
salty water sliding over the top from the sides of the gyre, some of which
was being mixed itself, some of which was forming fascinating interleaving
patterns with the cold, fresh central water.  We're now doing a bunch of
parallel tow-yo sections to build up a 3-d picture of the water masses
here.
  I've also been working on a paper which my advisor wants to see when I 
get back (Hi, John), and reading Horowitz and Hill, a very good 
electronics textbook.