Northern Anomaly Snow Job

Data Credits : Inverse ENSO, AO Index and NAO Index

Earlier this year, many weather-watchers were theorising that unusual conditions in the Arctic atmospheric pressure patterns could be behind the deeply cold and snowy winter :-

http://www.nasa.gov/topics/earth/features/coldweather-2009.html
http://www.dailykos.com/story/2010/1/6/822520/-Freak-Current-Takes-Gulf-Stream-to-Greenland
http://climatechangepsychology.blogspot.com/2010/01/weakening-of-polar-vortex-in-arctic.html

The anti-science mob just jumped up and down and yelled at it, calling it “global cooling”, but that’s what you’d expect from a one-dimensional crowd trying to “snow job” the truth about Global Warming.

However, it has now been reliably demonstrated that a combination of a moderately strong El Nino and a very low North Atlantic Oscillation (NAO) index locked in cold conditions and higher than usual precipitation leading to general whiteout in medium latitudes :-

http://www.agu.org/pubs/crossref/2010/2010GL043830.shtml

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About Last Winter

So, was the exceptionally cold winter 2009 – 2010 in North America, Europe and parts of Asia a sign of Global Cooling ?

Noooo. Not a bit of it. It was down to “internal variability” of the climate system :-

http://www.agu.org/pubs/crossref/2010/2010GL043830.shtml

“GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L14703, 6 PP., 2010 : doi:10.1029/2010GL043830 : Northern Hemisphere winter snow anomalies: ENSO, NAO and the winter of 2009/10 : Seager et al…conclude that the negative NAO [North Atlantic Oscillation] and El Nino [positive ENSO] event were responsible for the northern hemisphere snow anomalies of winter 2009/10…”

Expect fireworks and/or damp squibs from denier-sceptic quarters.