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I made this picture (and posted it) on 12 January:

An article in News Scientist says:

Freak winter is Europe's warmest for 700 years - earth - 20 June 2007 - New Scientist Environment

Separately, the temperatures experienced during autumn 2006 and winter 2007 are likely to have been the warmest in 500 years, they say. But the sequential combination of two such warm seasons is a still rarer event - probably the first since 1289.

Nomad or anyone, do you know more about this?

Luterbacher says the 1289 temperatures may have been caused by a large volcanic eruption in the tropics


*Traitor*, n.
A benighted individual who perceives an illusory distinction between serving his nation and abetting the criminals who govern it.
by DoDo on Thu Jun 21st, 2007 at 10:14:05 AM EST
is a professor who has particularly specialised in historical written records of the climate - which I find an interesting approach. The last work I read of him (years ago, in 2004) however mentioned that it was very hard to look further than 1500 AD, so the above makes sense to me.

The 1289 date, however, comes like a rabbit out of a hat to me. Have not heard of this before. (Large volcanic eruptions can indeed lead to regional warming (see example from Pinatubo here), even when it leads to global cooling.

by Nomad on Fri Jun 22nd, 2007 at 04:25:22 AM EST
[ Parent ]
I was thinking since that maybe he doesn't mean an identified volcanic erruption, but maybe a sediment layer, and his specifying of the tropics as its location may be a meteorologist's speculation based on the Pinaturbo effect.

*Traitor*, n.
A benighted individual who perceives an illusory distinction between serving his nation and abetting the criminals who govern it.
by DoDo on Fri Jun 22nd, 2007 at 04:49:28 AM EST
[ Parent ]
the date is based on an ash layer found in ice core(s). A sediment layer already means you have a vague idea of the location; you're nearer to the source. "Tropics" is a bit too vague.
by Nomad on Fri Jun 22nd, 2007 at 05:29:09 AM EST
[ Parent ]

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