Number of days earlier (negative numbers) or later (positive numbers) of (a) melt onset, (b) summer ice minimum, and (c) date that water is clear of ice for selected lakes in the central and eastern Canadian high Arctic from 1997 to 2011. Number of days’ change is reported relative to the 1997–2011 mean date (from remote sensing observations). Lakes in polar-oasis (relatively high annual precipitation) environments are shown as blue bars and lakes in polar-desert environments (relatively low annual precipitation) are shown as black bars. The red dashed line indicates the 1997–2011 mean change.
