ИСТИНА

onvective internal boundary layers (CBLs) develop over polynas and leads and during cold-air outbreak events over ice-open water edge in the Arctic region throughout a year. These boundary layers contribute significantly to an overall Arctic surface heat balance. Therefore it's crucial to represent CBLs precisely in numerical weather prediction and global climate models. However, they still cannot be resolved explicitly on these models' grids, so their impact must be parameterized. The first analytic solutions for CBL growth over time was presented almost 80 years ago (Zubov 1945), since then a wide range of parameterizations were developed. This study is aimed to evaluate the most recent of them (e.g. Zilitinkevich et al. 2012) and their performance over a variety of different background flow conditions by comparison to Large Eddy Simulation (LES) results. Those parameterizations are based on a bunch of assumptions such as linearity of heat flux with height, horizontal homogeneity of buoyancy inside CBL, etc. The validation of these assumptions under different background flow and surface conditions and an assessment of respective errors in CBL parameters are presented. LES data obtain with Large Eddy Simulation model developed in Institute of Numerical Mathematics of Russian Academy of Science (LES INM RAS). N. N. Zubov, Arctic Ice (Izd. Glavsevmorputi, Moscow, 1945) [in Russian]. S. S. Zilitinkevich et al. (Izvestiya, Atmospheric and Oceanic Physics, 2012) Vol. 48, No. 1, pp. 133–142.