Comparison of observed and modelled longwave downward radiation (2010–2016) at the high mountain BSRN Izaña station

Abstract. A 7-year (2010–2016) comparison study between measured and simulated longwave downward radiation (LDR) under cloud-free conditions has been performed at the Izaña Atmospheric Observatory (IZO, Spain). This analysis encompasses a total of 2062 cases distributed almost 50 % between day and night. Results show an excellent agreement between Baseline Surface Radiation Network (BSRN) measurements and simulations with LibRadtran V2.0.1 and MODTRAN V6 radiative transfer models (RTM), similar for both models. Mean bias (simulated-measured)