Greenland Albedo Reanalysis Product and Preliminary Accuracy Assessment

Surface albedo, defined as the ratio of the upward to downward solar irradiance, is an important climate parameter in the surface energy budget. In the polar region and other snow-covered areas, surface albedo feedback is an essential mechanism that contributes to climate change. The currently available long-term snow albedo products still need some improvements to achieve a higher resolution and accuracy. This paper takes Greenland ice sheet as an example. We implemented an algorithm to enhance the daily albedo product from MOD10A1 by a set of processing steps, including data pre-processing, de-nosing and gap-filling. The experimental albedo product from 2001 to 2018 of Greenland had been validated with ground-truth albedo from the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) provided by the Geological Survey of Denmark and Greenland (GEUS). The preliminary validation results showed that the reanalysis albedo product is temporally and spatially continuous with RMSE under 0.05.