A 5-degree latitude-longitude resolution data set for the domain 90-12.5N. The dataset is updated monthly and an updated version of this data set can be obtained at the NCAR data WWW archive (http://rda.ucar.edu/datasets/ds010.1/
The Arctic Oscillation (AO) is depicted in a correlation map of January-February-March SLP anomalies and AO values for 1931-65 and 1966-2000, respectively. The AO is the tendency for SLP anomalies near the pole to be of opposite sign to those in the latitudes near 45N.
Credit: Todd Mitchell, JISAO.