The Arctic Ocean sea level height mean state and variability as derived by the World Ocean model INMocean1.0: the role of numerical schemes

Abstract

The article examines the ability of various versions of the ocean part of the INM RAS Earth System model (ARTS-ESM) to reproduce the observed state (multiyear mean state and year-to-year variability) of the sea surface height (SSH) in the Arctic Ocean. The description of the space-time schemes used is given and the results of calculations under the CORE-II protocol are presented, which are compared with the data of the ORAS5 reanalysis. It is shown that the new version of the model (named INMocean1.0, version CMIP7) with spatial approximation of the Coriolis force by the triads method, in combination with the explicit Adams–Bashforth time scheme for momentum and Flux-Correction Transport (FCT) scheme for temperature and salinity, gives the most accurate results, and can be accepted as the main option.