The Institute's Dr Andreas Herber blamed an unusual
weather system dumping eastern European pollution within the Arctic circle, and said that a temperature spike could be expected.
Richard # 63, for that
weather to last long enough to become a climatological forcing (it would have to take gigatons of carbon out of one
system and
dump it into another) it would either have to be a catastrophic event (clathrates suddenly erupting, supervolcano erupting, etc) or long lasting (in which case open to climatological statistics rather than
weather chaotics).