Assessment of Three Satellite-Derived Surface Downward Longwave Radiation Products in Polar Regions

The radiation budget in polar regions plays an important role global climate change study. This study investigates the performance of downward longwave (DLR) three satellite products regions, including GEWEX-SRB, ISCCP-FD, and CERES-SYN. RMSEs are 35.8, 40.5, 26.9 W/m2 at all sites for results Arctic much better than those Antarctic, 34.7 W/m2, 36.0 26.2 38.8 54.8 28.6 Antarctic. Both GEWEX-SRB CERES-SYN underestimate DLRs most sites, while ISCCP-FD overestimates sites. DLR can capture seasonal variation both Antarctic Arctic. Though has best that RMSE within 30 accuracy still cannot meet requirement research. improvement mainly depends on quality improving input atmospheric parameters, cloud detection over snow ice surface consideration spatial resolution heterogeneity.