Figure 2: Dynamical systems analysis for the NCEP reanalysis.
From: Dynamical proxies of North Atlantic predictability and extremes
The scatter plot displays the daily values of the instantaneous dimension d and the persistence θ of the field. The NAO value for that day is indicated by the colourscale. The black solid lines mark the 0.02 and 0.98 quantiles of d and θ. The composite anomalies in SLP for the four regions delimited by the black lines are plotted as side panels and can be associated with known weather regimes: NAO+ (minima of d), NAO- (minima of θ), Atlantic Ridge (maxima of θ), Blocking (maxima of d). The black lines indicates regions where at least the 2/3 of extreme pressure anomalies have the same sign. The maps in this figure are generated by MATLAB R2013a with M_Map (a mapping package, http://www.eos.ubc.ca/rich/map.html).
