date: Fri, 08 Nov 1996 17:38:50 +0100 from: Theodor Forster subject: Sharpness quality test to: K.Briffa@uea.ac.uk Dear Keith, By order of Fritz Schweingruber I send you 10 chronologies from the sibirian region 65°21'N 66°58'E to 69°06'N 84°32'E. You found a drastical decrease in the max. latewooddensity compared to the measured summertemperatures from 1950 to 1990. To check the influence of technical inaccuracies in that timeframe, I choosed from each site all cores with top sharpness quality and calculaded a second chronology with them. Therefore you receive the following files splited out in larix sibirica and picea obovata. The second divide up is rowdates and indexed dates. LASIALL.HCR larix / all cores / from 7 sites / row LASITOP.HCR larix / 50 cores top quality / from same 7 sites / row LASI ALL.HCI larix / all cores / from same 7 sites / index LASITOP.HCI larix / 50 cores top quality / from same 7 sites / index PCOBALL.HCR spruce / all cores / from 3 sites / row PCOBTOP.HCR spruce / 26 cores top quality / from same 3 sites / row PCOBALL.HCI spruce / all cores / from same 3 sites / index PCOBTOP.HCI spruce / 26 cores top quality / from same 3 sites / index Please compare the complete chronologies (LASIALL,PCOBALL) and the chronologies only with cores of top quality (LASITOP,PCOBTOP) with the summertemperatures in the same region. The results will show us the influence of technical inaccuracies, which we can not eliminate totaly. Sincerily yours Theo Forster Attachment Converted: c:\eudora\attach\SHARTEST.zip