NUMERICAL EXPERIMENTS ON THE SELECTION OF PARAMETRIZATION SCHEMES OF MICROPHYSICAL CLIMATE SYSTEM PROCESSES IN THE CENTRAL ASIA REGION

In order to select a parameterization scheme for microphysical processes and processes in the atmospheric boundary layer in the Central Asian region, the difference between the observed and simulated meteorological parameters was calculated for 4 separate climatic seasons for 2000-2016. Publicly available observational data is borrowed from the global archives of the Meteorological Office UK and the Near-Surface Hydrology Laboratory at Princeton University USA. The boundary and initial conditions for the regional climate model were set on the basis of the ERA-Interim reanalysis data set. The results of numerical experiments are presented in the form of maps of the mean annual seasonal variability of the surface temperature at the level of 2 m and precipitation for the Central Asia domain. Three combinations of microphysics and boundary layer schemes are considered: the Thompson one-phase microphysics scheme using 5 classes of hydrometeors in combination with two atmospheric boundary layer schemes (YSU and MYJ) and the WRF Single Moment scheme with 6 classes of hydrometeors combined with the YSU scheme. It was found that simulation data using parametrization schemes for the MYJ PBL boundary layer and Thompson microphysics are better than others in agreement with the data on precipitation and surface layer temperature.

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