Table 2.

Basal melting in Gt per year due to surface melt-water heat for decadal averages 1991–2000 and 2001–2010, and for 2012.

Sector	Surface water 1991–2000 (Gt per year)	Surface water 2001–2010 (Gt per year)	Surface water 2012 (Gt per year)
Central east (CE)	0.4 ± 0.1	0.6 ± 0.2	0.9 ± 0.3
Central west (CW)	0.5 ± 0.2	0.8 ± 0.3	1.4 ± 0.4
Northeast (NE)	0.3 ± 0.09	0.6 ± 0.2	1.2 ± 0.3
North (NO)	0.3 ± 0.08	0.5 ± 0.1	0.9 ± 0.3
Northwest (NW)	0.5 ± 0.1	1.0 ± 0.3	1.6 ± 0.5
Southeast (SE)	0.6 ± 0.2	0.9 ± 0.3	1.4 ± 0.4
Southwest (SW)	1.0 ± 0.3	1.5 ± 0.5	2.6 ± 0.8
Total	3.5 ± 1.1	6.0 ± 1.8	10.0 ± 3.0

Note the substantially higher melt in 2012 due to large volumes of melt water.