The Palmer Station Antarctica LTER project is a treasure trove of long term, interdisciplinary datasets investigating the living and non-living parts of the Western Antarctic Peninsula ecosystem.
You can search the Datazoo site by key word, location of sample, and numerous other ways. There is information about how the data were collected and other means. More information about how to access the data are available here.
Get your kids diving into Antarctic ecosystems through data today: http://pal.lternet.edu/!