Improvements of PBL Scheme in INMCM5 Climate Model.

Locally one-dimensional ABL model of the moderately stable and highly stable boundary layer of the atmosphere were evaluated with the data obtained from numerical experiments with eddy-resolving turbulence models. It is shown that the best results are obtained by parametrizations which maintain turbulence at large gradient Richardson numbers. These parametrizations of turbulent diffusion for stable stratification were introduced into the INM RAS Earth System model [1].Based on a comparison with the reanalysis data, it is shown that an improved model of turbulence in the boundary layer reduces the average error in reproducing the current climate in high latitudes.Authors want to acknowledge partial funding by Russian Foundation for Basic Research (RFBR project 20-05-00776) and support from Russian Science Foundation (RSF grant 20-17-00190).1. Volodin, E. M., et al. "Simulation of the present-day climate with the climate model INMCM5." Climate dynamics 49.11 (2017): 3715-3734.