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.

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 MODIS                        Ice-off (snow-free) 0.95 0.90 0.97 0.93 0.95 0.92 0.94 0.97 0.92 0.97 0.96  Ice-off (snow) 0.97 0.87 0.96 0.92 0.94 0.92 0.94 0.97 0.87 0.95 0.96  Ice-on 0.83 0.92 0.82 0.84 0.89 0.85 0.89 0.91 0.91 0.92 0.52* IMS                        Ice-off (snow-free)         0.91 0.93 0.91 0.96 0.94 0.94 0.95  Ice-off (snow)         0.90 0.93 0.90 0.95 0.92 0.93 0.96  Ice-on         0.69 0.70 0.68 0.83 0.48 0.77 0.41*

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