The decadal variations associated with this phenomenon were written about by James Harrell and Harry van Loon.
The decadal variations associated with this phenomenon were written about by James Harrell and Harry van Loon. Like El Nino, it was quantified by Sir Gilbert Walker using variations in air pressure between two locations; Walker identified this pattern with Bliss in 1923. It is in a positive phase more than twice as often as it is in a negative phase and recent evidence suggests it may stay in a stronger positive phase with anthropogenic global warming. That results in warmer, wetter winters for northern Europe while a negative phase results in colder winters with fewer storms. Defined as the relative variation in atmospheric pressure between Iceland and the Azores, name, FTP, this climatic oscillation which takes its name from the oceanic basin in which it occurs.
The decadal variations associated with this phenomenon were written about by James Harrell and Harry van Loon.
North Atlantic Oscillation (or NAO)