Dataset of optical properites of chromophoric dissolved organic matter from lakes in S.W. Greenland obtained over a number of studies, and used in the publication listed below (submitted). Christopher Osburn (North Carolina State University), John Anderson (Loughborough University) , Colin Stedmon (Technical University of Denmark) , Madeline Giles (The James Hutton Institute) , Erika Whiteford (Nottingham Trent University) , Terry McGenity (University of Essex) , Alex Dumbrell (University of Essex) , Graham J C Underwood (University of Essex) Regional variation in the optical properties of chromophoric dissolved organic matter (CDOM) in arctic lakes of Southwest Greenland, [Paper # 2017JG003999 submitted to Journal of Geophysical Research - Biogeosciences).