Table 1. Integrated albedo change.

	Average	Minimum	Maximum	Reference
Dry (winter) clean snow	0.90	0.95	0.85	37
Wet clean snow	0.75	0.80	0.70	11
Red snow	0.65	0.77	0.53	11, Supplementary Table 1

Average, minimum and maximum albedo values (in terms of decrease in albedo) for dry clean snow, wet clean snow and red snow used to derive the integrated albedo change over 100 days (Supplementary Fig. 4).