Abstract: Breaking waves on the tropopause are viewed as potential vorticity (PV) streamers on middle-world isentropic levels. A Northern Hemisphere winter climatology of the streamers? spatial distribution and meridional orientation ...

Abstract: Jet streams located on the dynamical tropopause are accompanied by coaligned bands of enhanced potential vorticity (PV) gradients, and these bands can serve as space?time evolving waveguides for synoptic and larger-scale ...

Abstract: he North Atlantic jet stream during winter 2010 was unusually zonal, so the typically separated Atlantic and African jets were merged into one zonal jet. Moreover, the latitude?height structure and temporal variability of ...