Davide Faranda computed the local dimension d and local persistence θ of the daily SLP field from the NCEP reanalysis (Faranda et al., Sci. Rep. 2017).
The local dimension and persistence are compared to the weather regime classification.
Weather regimes are prefered atmospheric states (Legras and Ghil 1985; Vautard 1990). They can be computed on pressure fields with classification algorithms. We use a kmeans algorithm on sea-level pressure to determine four weather regimes over the North Atlantic region, from the NCEP reanalysis.
We use a method developed by Yiou et al. (2008) to stabilize the computation of the classes, by Monte-Carlo experiments and a classification of the experiments.
The A2C2 project develops open source software for the computation of atmospheric analogues. At present, the software is in a "developer" mode, i.e., it only contains a core for the computation & file manipulation. There is no cool front end with guis, graphics and those kinds of gizmos... which are under development.
At present, the core code can be obtained here.
Analogues of atmospheric circulation are weekly computed from the SLP of NCEP (daily) reanalysis. We consider the North Atlantic region (80W-30E; 30-70N).
The evaluation of the SLP analogues is updated regularly.