I don't want to go into ice albedo (and its feedback) as of yet because this becomes more interesting to discuss towards the end of the melting season. Some people maintain that it wouldn't matter if the Arctic becomes ice-free because it receives sunlight at such an oblique angle that most of it gets reflected back. I don't think this is true, but I really don't know much about it and hope to explore the basics some more come August or September.
In the meantime I came across the website of Polar geophysicist Don Perovich and found these informative Youtube movies.
Albedo measurements part 1:
Albedo measurements part 2: