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Step 3: CTD cast The CTD is attached to the winch cable and lowered to about 500 m. It’s then brought back up to the surface. The data it records are stored in the instrument to be downloaded when we return to Alert at the end of the day. From the CTD we obtain profiles of salinity, temperature, and oxygen.

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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