Figure 1: Boreal Summer (JJA) Zonal Mean Temperature Profiles.
From: Influence of Anthropogenic Climate Change on Planetary Wave Resonance and Extreme Weather Events
Shown are (a) JJA 1000 mb temperatures from ERA reanalysis data (1979–2015) for both climatological mean and QRA-favorable conditions (at 2.5° latitudinal resolution), (b) The difference between the two i.e. the anomalous zonal mean temperature profile associated with QRA-favorable conditions, (c) The QRA fingerprint defined as the former quantity, confined to the extatropical region 25–75N, centered on zero, and interpolated onto 5° latitudinal grid commensurate with model simultions, and (d) the associated meridional temperature gradient.
