The fast-flowing main trunk of Thwaites accelerated by 0.8 km/year, or 33%, between 1973 and 1996, and another 33% between 2006 and 2013 (7). Between 1970–2003 and 2010–2013, ice discharge increased at a rate of 2.2 Gt/year2, and the rate quadrupled in 2003–2010 (9.5 Gt/year2). More recently, parts of the glacier have been observed to thin as much as 4 m/year (8).
