Slide 10: Proxy data sources: Dendroclimatology
The pattern of growth of trees is laid down within their structure, providing a high-resolution (annual) picture of climatic variables in the Holocene.
Much can be deduced from growth bands - the thickness corresponds to the favourability of climatic conditions (light, temperature, rainfall, windspeed) (Bradley,1985; Fritts, 1976).
The density of the bands says much about the growing season (latewood is much denser than earlywood) (Schweingruber et al., 1978).
Isotopic analysis of the bands can also give us information about the climatic conditions. (Epstein et al., 1976).
By studying a number of trees in an area of a similar age, a statistically sound analysis of conditions can be obtained.
Bradley, R.S., 1985. Quaternary Palaeoclimatology: Methods of Palaeoclimatic Reconstruction. Unwin Hyman, London, 472pp.
Epstein, S., Yapp, C.J. & Hall, J.H., 1976. The determination of the D/H ratio of non-exchangeable hydrogen in cellulose extracted from aquatic and land plants. Earth Planet. Sci. Lett., 30, pp. 241-251.
Fritts, H.C., 1976. Tree rings and climate. Academic Press, London.
Schweingruber, F.H., Fritts, H.C., Bräker, O.U., Drew, L.G. & Schär, E., 1978. The X-ray technique as applied to dendroclimatology. Tree Ring Bull., 38, pp. 61-91.