Our analysis is based on ERA Interim Reanalysis data known to be the most reliable source of reanalysis data at the moment. The atmospheric data are analyzed by comparing the correlation of two time slices considered as the "high ice phase" 1990-2000 and the "low ice phase" 2001-2010 with an index of sea ice concentration. The analysis includes also the computation of heat and localized Eliassen-Palm fluxes for time periods between 10-90 days and 2-6 days. A main focus is to characterize the impacts on quasi-stationary planetary waves and the synoptic scale circulation seperately. We describe physical mechanisms how the ice free parts of the Arctic Ocean in September influence the atmosphere in the following winter. Due to the additional oceanic heat source, positive atmospheric temperature anomalies occur that persist into the next winter. Our studies show a reduced vertical stability of the atmosphere and changing heat fluxes due to an earlier onset of baroclinic instability. Nonlinear feedbacks generate changes in baroclinic and planetary wave energy fluxes.
In addition to regional feedbacks between ocean, ice and atmosphere there are remote impacts on planetary waves described by changing large-scale atmospheric wave trains over the Pacific Ocean. These changes in mid latitudes deliver a clear hint that the Arctic sea ice decrease in the low ice phase triggers large scale atmospheric teleconnection patterns which could be a possible feedback for the recent shift to a negative AO phase.