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Hurrell Wintertime SLP-based Northern Annular Mode (NAM) Index
The NAM (or Arctic Oscillation) is defined as the first EOF of NH (20°-90°N) winter SLP data. It explains 23% of the extended winter mean (December-March) variance, and it is...- dataset NetCDF
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Hurrell North Atlantic Oscillation (NAO) Index (PC-Based)
The principal component (PC)-based indices of the North Atlantic Oscillation (NAO) are the time series of the leading Empirical Orthogonal Function (EOF) of SLP anomalies over...- dataset NetCDF
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North Pacific (NP) Index by Trenberth and Hurrell; Monthly and Winter
The North Pacific Index (NP index or NPI) is the area-weighted sea level pressure over the region 30°N-65°N, 160°E-140°W. The NP index is defined to measure interannual to...- dataset NetCDF
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Hurrell North Atlantic Oscillation (NAO) Index (Station-Based)
The winter (December thru March) station-based index of the NAO is based on the difference of normalized sea level pressure (SLP) between Lisbon, Portugal and...- dataset NetCDF
