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By Malcolm K. Hughes, Henry F. Diaz

The Medieval hot interval and the Little Ice Age are broadly thought of to were the foremost positive aspects of the Earth's weather over the last one thousand years. during this quantity the difficulty of even if there fairly was once a Medieval hot interval, and if this is the case, the place and whilst, is addressed. the categories of proof tested contain historic records, tree jewelry, ice cores, glacial-geological documents, borehole temperature, paleoecological info and files of sun receipts inferred from cosmogenic isotopes. progress within the availability of a number of of those varieties of facts lately, and technical advances of their derivation and use, warrant this state of the art second look of Medieval hot interval.
The booklet could be of price to all people with an curiosity within the usual variability of the weather procedure, for instance these serious about looking forward to and detecting anthropogenic weather swap.

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The Medieval Warm Period

The Medieval hot interval and the Little Ice Age are extensively thought of to were the main beneficial properties of the Earth's weather over the last one thousand years. during this quantity the difficulty of no matter if there relatively used to be a Medieval hot interval, and if this is the case, the place and while, is addressed. the categories of proof tested contain ancient records, tree earrings, ice cores, glacial-geological documents, borehole temperature, paleoecological info and documents of sun receipts inferred from cosmogenic isotopes.

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D. and Wigley, T. M. : 1983, 'A Comparison of Evidence for the Late Holocene Summer Temperature Variations in the Northern Hemisphere', Quat. Res. 20, 286-307. Zhang, De'er: 1984, 'Synoptic-Climatic Studies of Dust Fall in China since Historic Times', Sci. Sin. B27,825-836. Zhang, De' er: 1988, 'The Method for Reconstruction of the Dryness/Wetness Series in China for the Climatic Change March 1994 142 Malcolm K. Hughes and Henry F. Diaz Last 500 Years and Its Reliability', in Zhang, 1. ), The Reconstruction of Climate in China for Historical Times, Science Press, Beijing, China, pp.

Diaz record of temperature. It has the advantages of providing a direct estimate in temperature units, and of not being restricted to recording only part of the year. , or in the first half of the present millennium, that had annual temperatures above the long-term mean. 8. Concluding Remarks We come back to our original question: was there a 'Medieval Warm Period', and if so, where and when? D. may have been associated with warmer conditions than those prevailing over most of the next five centuries (including the twentieth century), at least during some seasons of the year in some regions.

D. 1. Introduction During the last few hundred years glaciers in both hemispheres expanded. Their maximal positions can be identified by the moraines they left behind a kilometre or two away from the present retreating ice fronts. Moraines formed by earlier periods of enlargement can, given favourable circumstances, be dated. Dating of organic material above a moraine provides a minimal age for its formation. Material from beneath it can provide a maximum age. A sample from within a moraine may give a closer approximation of the time of formation.

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