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The eddy-driven jet is located in the midlatitudes, and its movement is strongly coupled to regional weather, local air temperature, extreme event frequency and wind-driven ocean circulations. In both hemispheres, the eddy-driven jet is bounded on one side by the pole and often, on the opposite side, by strong Hadley-driven winds. This talk will explore how the eddy-driven jet, and its variability, exist within these limits, and how eddy and jet variability may change as the jets shift poleward with climate change.
We will show that the structure of jet variability is a strong function of the jet position, in three sectors of the globe, using data from observations and comprehensive global circulation models (CMIP5). Our results highlight that relatively small biases in jet latitude can cause la differences in tropospheric variability between models and observations, as well as among models. In addition, some models project the jet will shift up to 5 degrees poleward over the next century, and so it is possible that the present-day "annular mode" patterns of jet variability could change in the future.