Greenland margin CTD casts

[trey-stafford]

Twila notes that she does not think there is a synthesis database for this yet. Twila says:

The NASA Oceans Melting Greenland (OMG) mission did do quite a few CTD casts (https://omg.jpl.nasa.gov/data/) but that is just one source.

I think these requests fall into the category of things people wish QGreenland did (create new synthesized databases) but are not actually activities that we do.

This suggestion received from feedback for QGreenland v3 alpha4 (https://github.com/nsidc/qgreenland/issues/674)