Download Glaciers and environmental change by Atle Nesje PDF

By Atle Nesje

This authoritative new textual content offers an intensive, up to date account of glaciers and ice sheets as screens and symptoms of environmental switch. It examines the checklist of environmental swap inside glaciers and ice sheets, and that of previous environments left via backing out glaciers. those subject matters are tested in the context of environmental switch quite often and international weather switch specifically. tools of utilizing palaeoenvironmental documents are assessed and the results for destiny environmental swap are discussed.

Evidence from glacier ice left within the panorama or in the geological list, presents probably the most vital resources of knowledge on environmental swap. 'Glaciers and Environmental swap' is a finished account of glaciers andice sheets as screens and indictaors of environmental swap. in response to the most recent examine, this publication consolidates a various diversity of knowledge and explains their purposes. it additionally assesses equipment of utilizing palaeoenvironmental records.

This authoritative new textual content examines not just the documents of environmental swap inside glaciers but additionally that of prior environments left by way of chickening out glaciers. those subject matters are tested in the context of latest debates in environmental swap and the quantity additionally seeks to attract conclusions concernign previous, current and destiny climatic swap when it comes to glaciers.

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Extra resources for Glaciers and environmental change

Sample text

On longer time-scales, glacier fronts are subject to advance and retreat as a result of climate change or internal instabilities. Climatic influences on the frontal response can be divided into factors causing changes in ablation and accumulation. Debris-covered glacier fronts are, however, rather insensitive to changes in mass balance. Varying amounts of ice flowing through a glacier causes changes in ice thickness and gradients and thereby influences the driving stresses. Advance and retreat of the glacier front normally lags behind the climate forcing because the signal must be transferred from the accumulation area to the snout.

1997). These continuous records are helpful in producing a hemispheric and global chronology of explosive volcanism and assessing the climatic effects of volcanism. 20 The Holocene record of electric conductivity measurements (ECM) and volcanic sulphate in the GISP2 ice core. The records are presented as standard deviation units. Adapted from Taylor et al. (1997) and Zielinski et al. (1997) enhanced volcanism and periods of climate change. An increasing number of explosive volcanic eruptions at 27,000-36,000 and 79,000-85,000 years BP may reflect initial ice sheet growth.

Karlen, 1976, 1981; Nesje et al, 1991; Karlen and Matthews, 1992; Matthews and Karlen, 1992; Dahl and Nesje, 1994, 1996). ) Rock surface colour (Mahaney, 1987), rock disintegration (Innes, 1984), rock surface hardness and roughness (Matthews and Shakesby, 1984; McCarroll, 1989; McCarroll and Nesje, 1993) and weathering-rind thickness have been used to obtain relative ages. g. Colman, 1981). In conclusion, direct observation and measurements, historical documents, dendrochronology, lichenometry, radiocarbon dating and tephrochronology are considered the most accurate dating approaches in glacier forelands.

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