Auxiliary Material for Paper 2011JF002126 Antarctic surface melting dynamics: Enhanced perspectives from radar scatterometer data Luke D. Trusel and Karen E. Frey Graduate School of Geography, Clark University, Worcester, Massachusetts, USA Sarah B. Das Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA Trusel, L. D., K. E. Frey, and S. B. Das (2012), Antarctic surface melting dynamics: Enhanced perspectives from radar scatterometer data, J. Geophys. Res., 117, F02023, doi:10.1029/2011JF002126. Introduction This auxiliary material details the melt detection decision tree process, a threshold sensitivity analysis, and annual melt duration and intensity maps. The melt detection process and sensitivity analysis are described in Text S1. The decision tree process used to classify melt in this study is detailed in Figure S1. Annual maps of melt duration and intensity are shown in Figures S2 and S3, respectively. Changes to the QuikSCAT-AWS linear regression parameters as a function of threshold choice are shown in Figures S4 and S5. 1. 2011jf002126-txts01.txt Text S1. A description of the melt detection process and sensitivity analysis. 2. 2011jf002126-fs01.eps Figure S1. Decision tree process used in the study to classify surface melting from QuikSCAT data. 3. 2011jf002126-fs02.eps Figure S2. Annual maps of melt duration and the mean melt duration. Mean duration is shown for days melting more than 1 day on average over the time series. 4. 2011jf002126-fs03.eps Figure S3. Annual maps of MDD-based melt intensity and the mean melt intensity. Mean melt intensity is shown for days melting more than 1 day on average over the time series. 5. 2011jf002126-fs04.eps Figure S4. Plot of the coefficient of determination (R^2) between QuikSCAT melting days (MD) and melting decibel days (MDD) to in situ positive temperature days (PD) and positive degree-days (PDD), respectively. 6. 2011jf002126-fs05.eps Figure S5. Plot of changes in linear regression parameters with varying thresholds.