Pacific Fisheries Environmental Laboratory
National Marine Fisheries Service
Southwest Fisheries Science Center
PFEL Monthly Environmental Indices
NOIx, SOIx, SOI
On a monthly basis, PFEL generates time series of NOIx (extratropical Northern Oscillation Index) and
its analog, the SOIx (extratropical Southern Oscillation Index). These are new
indices of midlatitude climate fluctuations that show interesting relationships with fluctuations in marine ecosystems and populations.
They reflect the variability in
equatorial and extratropical teleconnections and represent a wide range of
local and remote climate signals. The indices are
counterparts to the SOI (Southern Oscillation Index) that relate variability
in the atmospheric forcing of climate change in northern and southern midlatitude hemisphere
regions.
For a description of these environmental indices and methods used in their derivation,
please see the Products page
