By Philip Douglas Jones, Raymond Stephen Bradley, Jean Jouzel
A profound wisdom of the prior weather is key for our knowing of world warming. The previous 2000 years are either the interval that's of so much relevance to the subsequent century and that for which there's the main proof. High-resolution proxy files for this era can be found from various assets. 5 sections examine dendroclimatology, ice cores, corals, old files, lake varves, and different symptoms. the ultimate sections conceal the histories of assorted forcing elements and try and compile files from numerous resources and supply explanations.
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Additional resources for Climatic Variations and Forcing Mechanisms of the Last 2000 Years
1500. Routledge, London, 331-348 Cook ER, Briffa KR, Jones PD (1994) Spatial regression methods in dendroclimatology: a review and comparison of two techniques. International Journal of Climatology 14: 379-402 Cook ER, Briffa KR, Meko DM, Graybill DA, Funkhouser G (1995) The 'segment-length curse' in long tree-ring chronology development for palaeoclimatic studies. The Holocene 5: 229-237 Cooper CF (1986) Carbon dioxide enhancement of tree growth at high elevations. Science 231: 859 Cramer JS (1987) Mean and variance of R2 in small and moderate samples.
Some initial impressions of parts of the network, as it stands at present, are given below. More detailed, quantitative interpretation of these data, based on more systematic analyses of the complete data set held at Birmensdorf is currently underway. Here, ring width and maximum density chronologies, standardized using the Hughershoff function (Braker, 1981), from two longitudinal transects across northern Russia and Europe provide a first, qualitative overview. The northern Eurasian part of the northern hemispheric network (Figs.
These results (shown in Table 2) indicate no significant elevational influence on mean density, at least over the range of elevations involved in these calculations. Table 2: Correlations between the mean maximum-Iatewood-density of different age classes of the Sob River samples and their elevations above sea level. The density data in each age class are averaged over different time periods so that effects of climate variability should hopefully largely cancel out. l. 08 (9) The number of cases involved for each correlation is shown in parentheses 36 Neither is there evidence that anthropogenic fertilization may be amplifying the apparent warmth of the 20th century.