지구온난화 환경에서 편서풍과 북극 기후와의 관계

Abstract

We analyzed the outputs of the historical and Representative Concentration Pathway 4.5 runs of the Coupled Model Intercomparison Project Phase 5 multi-model dataset to investigate influence of climate change in the Arctic region on westerly wind under greenhouse warming.The changes in zonal wind in the multi- model ensemble mean (MME) of the 34 coupled general circulation models (CGCMs) exhibit a strengthening of the westerly wind and its poleward shift. However, a considerable diversity in zonal wind responses exists among CGCMs. The differences in the simulated zonal wind responses are dependent on two features of Arctic climate changes, i.e., Arctic surface warming and polar cap cooling. Strengthening of westerly winds tends to shift equatorward in the models in which Arctic surface warming is stronger, whereas it tends to shift poleward in the models in which Arctic surface warming is relatively weak and polar cap cooling is stronger. wind under greenhouse warming.The changes in zonal wind in the multi- model ensemble mean (MME) of the 34 coupled general circulation models (CGCMs) exhibit a strengthening of the westerly wind and its poleward shift. However, a considerable diversity in zonal wind responses exists among CGCMs. The differences in the simulated zonal wind responses are dependent on two features of Arctic climate changes, i.e., Arctic surface warming and polar cap cooling. Strengthening of westerly winds tends to shift equatorward in the models in which Arctic surface warming is stronger, whereas it tends to shift poleward in the models in which Arctic surface warming is relatively weak and polar cap cooling is stronger.