Keith R. Briffa

Keith R. Briffa, 64, died on October 29, 2017. Keith was born December 27, 1952, in Liverpool, United Kingdom. He earned a B.Sc. (Honours) degree in Biological Sciences at the University of East Anglia (UEA) in 1974 and joined the Climatic Research Unit (CRU) there in 1977. He received his Ph.D. from the UEA School of Environmental Sciences in 1984, successfully defending his thesis “Tree-Climate Relationships and Dendroclimatological Reconstruction in the British Isles.” He stayed at CRU for the 40 years of his remarkably productive and significant scientific career, having the title of Emeritus Professor at the time of his passing. Keith showed great breadth of scientific understanding, creativity, rigor, willingness and ability to collaborate and unflinching intellectual honesty. These attributes are clearly evident in all his work, from his Ph.D. dissertation to the most recent of his more than 130 publications. He has been a central figure in the elaboration and testing of new and improved approaches to dendrochronology in general and to dendroclimatology in particular. Especially indispensable contributions include methods for evaluating common signal strength in tree-ring collections, including Expressed Population Signal (EPS) and Subsample Signal Strength (SSS). Keith also investigated methods of tree-ring standardization based onGaussian filters, and later the groundbreaking Regional Curve Standardization (RCS) method.His identification of apparent reduced sensitivity of tree-ring records to temperature at high latitudes in recent decades (“divergence”) stimulated much critical examination and improvement in dendroclimatology. Keith’s research contributed greatly to the analysis of tree-ring networks on regional to global scales and their use in the rigorously tested reconstruction of climate fields based on the method of ‘Orthogonal Spatial Regression’ (OSR) developed in his thesis. He was at the very