Jet stream variability in a polar warming scenario – a laboratory perspective

Abstract. We report on a set of laboratory experiments to investigate the effect polar warming mid-latitude jet stream. Our results show that progressive decrease in meridional temperature difference slows down eastward propagation stream and complexifies its structure. Temperature variability decreases relation “Arctic warming” only at locations representing Earth's mid-latitudes, which are influenced by stream, whilst such trend is reversed subtropical region south simulated jet. The reduced narrower distributions hence milder extreme events. However, our also frequency events increases mid-latitudes with decreased difference, it towards subtropics. Despite missing land–sea contrast model, we find qualitatively similar trends experimental data National Centers for Environmental Prediction (NCEP) reanalysis data.