AO [1] Arctic Oscillation index based on SLP,
Arctic Oscillation index based on SLP,
Index values 1899-Dec1957 are based on data described in Trenberth and Paolino (1980).,
Index values Jan1958 to current are from the NCEP/NCAR Reanalysis,
(
eps,
pdf,
metadata,
raw data,
netcdf)