What an in-cre-di-ble coincidence!
Few days later than Taxelson brought to my memory this case, and while I was searching for bibliography about a totally different argument, I found something strictly related to it, if not the original paper I was thinking about…
J. Roger Bray 1982, Alpine glacial advance in relation to a proxy summer temperature index based mainly on wine harvest dates, A.D. 1453–1973
, in “Boreas”, Volume 11, Issue 1, pp. 1–10.
There is an abstract on “Wiley online library” (http://onlinelibrary.wiley.com/doi/10.1 ... x/abstract
“A highly significant correlation was calculated between French wine harvest dates and central England summer temperature from 1659 to 1879 which harvest dates might be used to approximate western European summer temperatures for the pre-instrumental period. A proxy summer temperature index was thereby constructed which combined French and German wine harvest and central England temperature data. This index was significantly correlated with a tree-ring density prealpine Swiss summer temperature index from 1484 to 1973 and also with Northern Hemisphere annual temperatures from 1579 to 1973 (…)”
Though the author is probably the same one with a 0,80 P2Yrs CorrC (I don’t think many people dedicate themselves to this specific argument, and furthermore I recall something about relationship with glacial advance…), I would not assure that this is the paper I referred to, since I think I remember it was not in English. I would say that it was in French or Italian: in this latter case that would be probably a translated edition of a book. Anyway, it seems that I was wrong about application of dendrochronology, since it appears that he uses indices derived from tree ring density too.