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Fig8.2.7-1: Geographical patterns of Euro-Atlantic climatological regimes (both anomalies and full fields) as used at ECMWF. North Atlantic Oscillation, positive phase (NAO+), North Atlantic Oscillation, negative phase (NAO–), Blocking (BLO+), The Atlantic Ridge (AR) circulation pattern is a particular case of Anti-blocking (BLO–), inwhich in which the important feature is the trough over Scandinavia. Geopotential anomalies (colour shading) and geopotential (contours) at 500 hPa are shown.
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