Dynamical core in atmospheric model does matter in the simulation of Arcticclimate

Abstract

The present climate experiments using the SE and FV dynamical cores showed different zonal mean temperature distributions despite using the same physical settings. Compared to the FV core, the SE core simulated a colder troposphere over the subtropics and a warmer near-surface over the Arctic region. Especially warmer temperatures of more than 3 K is observed at the lower troposphere below 850 hPa north of 60 °N in the SE core simulation. Compared to the FV simulation, the altered eddy momentum and heat fluxes of the SE simulation contributed to changes in mean circulation, producing rising motion at about 40 °N and sinking motion north of 60 °N in the troposphere by indirectly forced circulation. As a result, the SE core produced an enhanced sinking motion in the troposphere north of 60 °N that enforced a warmer lower troposphere through adiabatic warming.