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A visit to APL by Professor Michael St. John’s
Environmental Science class from the Art Institute of Seattle
October 28, 2005

(1) Looking at salty and fresh ice: “Can you tell the difference?”
(2) Green food coloring shows the brine channels in salty ice, while it just runs off the glassy fresh ice or finds cracks.
(3) Wendy explains the ADCP.
(4) Mike lectures about climate change.

…Also in (1) you can see the “Salinity Taste Test” in which we challenge the students to distinguish between water samples with salinities 0 - 40 ppt, in 5 ppt increments. To save time, they randomly select only 3 samples. In previous trials, we found that 5 ppt increments are harder to distinguish at the salty end of the scale, possibly because the % difference is not as great. So I set up a big chart to mark errors and expected to see more at higher salinities. However, this day there were NO errors at all! Maybe those right-brained people have better tongues than us left-brainers?!

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Polar Science Center
Applied Physics Laboratory
1013 NE 40th Street
Seattle, WA 98105
206-543-1300

University of Washington


This material is based upon work supported by the National Science Foundation under Grant No. 0230427.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the
National Science Foundation.

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