Hurrell's North Atlantic Oscillation (NAO) Index from NCAR
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https://cmr.earthdata.nasa.gov/search/concepts/C1214606875-SCIOPS.html
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资源简介：
The North Atlantic Oscillation (NAO) is based on the difference of
normalized sea level pressure (SLP) between Lisbon, Portugal or Ponta
Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1864. The
SLP anomalies at each station were normalized by division of each
seasonal pressure by the long-term (1864--1983) standard
deviation. The station data were obtained from the World Monthly
Surface Station Climatology: http://rda.ucar.edu/datasets/ds570.0/
Station data includes:
Extended Winter (Dec - Mar) index of the NAO based on the difference of
normalized sea level pressure (SLP) between Lisbon, Portugal and
Stykkisholmur/Reykjavik, Iceland since 1864.
Seasonal (DJF,MAM,JJA,SON) indices of the NAO are based on the
difference of normalized sea level pressure (SLP) between Ponta
Delgada, Azores and Stykkisholmur/Reykjavik, Iceland since 1864.
Annual: The annual index of the NAO is based on the difference of
normalized sea level pressure (SLP) between Ponta Delgada, Azores and
Stykkisholmur/Reykjavik, Iceland since 1864.
The values in the above table differ slightly from those in Hurrell
(1995) because of continual updates to the data and a change in the
base period. The SLP anomalies at each station were normalized
relative to the 120-year period 1864--1983. Hurrell (1995) normalized
relative to 1864--1994.
提供机构：
SCIOPS
