Just as fresh snow has a higher albedo than does dirty snow, the albedo of snow-covered sea ice is far higher than that of sea water.
dʒˈʌst æz fɹˈɛʃ snˈoʊ hɐz ɐ hˈaɪɚɹ ælbˈiːdoʊ ðɐn dˈʌz dˈɜːɾi snˈoʊ, ðɪ ælbˈiːdoʊ ʌv snˈoʊkˈʌvɚd sˈiː ˈaɪs ɪz fˈɑːɹ hˈaɪɚ ðɐn ðæt ʌv sˈiː wˈɔːɾɚ.