Mid-Latitude Jet Response to Pan-Arctic and Regional Arctic Warming in Idealized GCM

To study the dynamical mechanism by which Arctic amplification affects extreme weather events in mid-latitude, we investigated local and remote circulation response to pan-Arctic regional thermal forcing. A comprehensive atmospheric GCM (General Circulation Model) coupled a slab mixed-layer ocean model is used for experiment. With increasing forcing configuration, mid-latitude jet tends shift equatorward, mainly due southward of convergence zone eddy-heat flux eddy-momentum flux. From forced experiments, zonal mean similar from configuration. The non-zonal characterized 300 hPa circumpolar wind wavenumber-1 structure, establishes an enhanced wavier jet. In polar region at hPa, drives distinct east–west dipole pattern, anticyclonic located west forcing, cyclonic east. lower-level shows opposite pattern upper-level region. While strength increases with gradual overall unchanged. warming simulation, compared warming, residual heat causes advection mid-latitude.