Table 6: Spearman correlation ( ) values for both mean MODIS- and IMS-detected ice-off compared to simulated ice-off (both with and without a snow cover on the ice) and ice-on dates. All values are significant at the 0.001 level.

20002001200220032004200520062007200820092010

MODIS
 Ice-off (snow-free)0.950.900.970.930.950.920.940.970.920.970.96
 Ice-off (snow)0.970.870.960.920.940.920.940.970.870.950.96
 Ice-on 0.830.920.820.840.890.850.890.910.910.920.52*

IMS
 Ice-off (snow-free)0.910.930.910.960.940.940.95
 Ice-off (snow)0.900.930.900.950.920.930.96
 Ice-on 0.690.700.680.830.480.770.41*

*Reduced dataset for FU 2010 as lakes that froze up in 2011 were not included in the simulations.