date: Thu Oct 9 10:34:51 2008 from: Keith Briffa to: Astrid.Ogilvie@Colorado.EDU Dear Dr Ogilvie, I am writing on behalf of the Director , Professor Philip Jones to say that The Climatic Research Unit would be very happy to collaborate on the project you propose: Understanding Climate-Driven Phenological Change - Observations, Adaptations and Cultural Implications in Northeastern Siberia and Labrador/Nunatsiavut (PHENARC). This Unit, as you are well aware possesses large holdings of instrumental climate records at individual station locations and in wider gridded form , representing a range of spatial and temporal resolutions and covering all of the regions appropriate to your proposed research. We also have extensive experience in the interpretation and analysis of high (ie. annual) -resolution proxy climate data - with a relevant focus in this case, on the production of tree-ring and tree-ring-density records that provide strong indications of summer temperature variability in various regions of northern Eurasia , spanning time periods ranging up to several millennia. We have published various papers describing the nature of warming patterns , changing seasonality (particular in the characteristics of "growing season" changes), and the reconstruction and simulation of past and future warming characteristics in North America and Eurasia. I include a selection of relevant references below. I feel sure that our co-operation would result in profitable scientific advances in the analysis of the nature and consequences of climate changes in these northern areas. I wish you success with your application. sincerely Keith. R. Briffa Deputy Director, Climatic Research Unit Selected relevant references- for other references see [1]http://www.cru.uea.ac.uk/ Briffa, K.R., Shishov, V.V., Melvin, T.M., Vaganov, E.A., Grudd, H., Hantemirov, R.M., Eronen, M. and Naurxbaev, M.M., 2007 Trends in recent temperature and radial tree growth spanning 2000 years across northwest Eurasia Philosophical Transactions of The Royal Society B, [2]doi:10.1098/rstb.2007.2119 Jones, P.D. and Briffa, K.R., 2006 Unusual climate in northwest Europe during the period 1730 to 1745 based on instrumental and documentary data. Jones, P.D. and Moberg, A., 2003 Hemispheric and large-scale surface air temperature variations: an extensive revision and an update to 2001. Journal of Climate 16, 206-223 American Meteorological Society Jones, P.D., Osborn, T.J. and Briffa, K.R., 2003 Changes in the Northern Hemisphere annual cycle: implications for paleoclimatology? Journal of Geophysical Research 108, 4588 ([3]doi.10.1029/2003JD003695) Briffa, K.R. and Matthews, J.A. (eds), 2002 Analysis of dendrochronological variability and associated natural climates in Eurasia (ADVANCE-10K). The Holocene (Special Issue) 12(6), 759pp Available in The Holocene (Special Issue) 12(6). Briffa, K.R., Osborn, T.J., Schweingruber, F.H., Jones, P.D., Shiyatov, S.G. and Vaganov, E.A., 2002 Tree-ring width and density around the Northern Hemisphere: Part 2, spatio-temporal variability and associated climate patterns. The Holocene 12, 759-789 Jones, P.D., Briffa, K.R., Barnett, T.P. and Tett, S.F.B., 1998 High-resolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with General Circulation Model control-run temperatures. The Holocene 8(4), 455-471 Briffa, K.R., Jones, P.D., Schweingruber, F.H., Shiyatov, S.G. and Vaganov, E.A., 1996 Development of a north Eurasian chronology network: Rationale and preliminary results of comparative ring-width and densitometric analyses in northern Russia. Tree Rings, Environment and Humanity (Eds. J.S. Dean, D.M. Meko and T.W. Swetnam), Radiocarbon 1996, pp.25-41 Jones, P.D. and Briffa, K.R., 1995 Growing season temperatures over the former Soviet Union. International Journal of Climatology 15, 943-959 -- Professor Keith Briffa, Deputy Director, Climatic Research Unit University of East Anglia Norwich, NR4 7TJ, U.K. Phone: +44-1603-593909 Fax: +44-1603-507784