Mass balance of Greenland's three largest outlet glaciers, 2000-2010 Howat, I.M, Y. Ahn, I. Joughin, M. van den Broeke, J. Lenaerts and B.E. Smith Geophysical Research Letters, 38, L12501, doi:10.1029/2011GL047565, 2011 Dataset The matlab data file "Big3.mat" contains four structures, one for each flux gate shown in figure 1 of the paper; h = helheim, k = kangerdlugssuaq, j = jakobshavn south (main) branch, jn = jakobshavn north branch The structures h, k and j contain the following fields, where n is the number of speed observations, m is the number of thickness observations and p is the number of front observations: t: [1xn double] speed observation times (datenum) u: [1xn double] speed observations (m/d) dt: [1xn double] temporal baseline (days) ue: [1xn double] speed error (m/d) source: [1xn double] speed data source: 1=optical, 2=SAR Ht: [19xm double] thickness observation times (datenum) H: [19xm double] thickness observation (m) Hi: [1x3n double] interpolated thickness at speed observation times (m) D: [1xn double] discharge at speed observation times (Gt/yr) Der: [1xn double] discharge random error at speed observation times (Gt/yr) Deb: [1xn double] discharge bias error at speed observation times (Gt/yr) De: [1xn double] discharge total error at speed observation times (Gt/yr) smb.m: [132x1 double] surface mass balance rate (Gt/month) smb.t: [132x1 double] surface mass balance time (datum) smb.ref: [12x1 double] monthly reference surface mass balance rate (Gt/month) Di: [132x1 double] discharge interpolated to smb times (Gt/yr) Scum: [132x1 double] cumulative surface mass balance (Gt) Dcum: [132x1 double] cumulative discharge (Gt) Scume: [132x1 double] cumulative surface mass balance error (Gt) Dcumer: [132x1 double] cumulative discharge random error (Gt) Dcumeb: [132x1 double] cumulative discharge bias error (Gt) Dcume: [132x1 double] cumulative discharge total error (Gt) cume: [132x1 double] total cumulative error (Gt) dF: [1xp double] change in front position (m) dFt: [1xp double] front position observation times (datum) dFV: [1xp double] change in front mass (Gt) dFVe: [1xp double] change in front mass error (Gt) dFVi: [132x1 double] change in front mass interpolated to smb times (Gt) dFVie: [132x1 double] interpolated change in front mass error (Gt) RK1: [2x2 double] time and speed from Rignot and Kanagaratnam, 2006 RK2: [5x2 double] time and speed from Rignot et al., 2008 The structure jn only includes speed, thickness and discharge fields. These discharges were summed with those in structure j to obtain those mass change values.