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 displays and symptoms of environmental swap. It examines the checklist of environmental switch inside glaciers and ice sheets, and that of prior environments left via backing out glaciers. those issues are tested in the context of environmental swap often and worldwide weather switch specifically. equipment of utilizing palaeoenvironmental files are assessed and the consequences for destiny environmental switch are discussed.

Evidence from glacier ice left within the panorama or in the geological list, offers probably the most vital assets of knowledge on environmental swap. 'Glaciers and Environmental switch' is a complete account of glaciers andice sheets as screens and indictaors of environmental switch. in accordance with the newest examine, this e-book consolidates a various diversity of information and explains their purposes. it additionally assesses equipment of utilizing palaeoenvironmental records.

This authoritative new textual content examines not just the documents of environmental switch inside of glaciers but additionally that of prior environments left by way of taking flight glaciers. those topics are tested in the context of up to date debates in environmental swap and the amount additionally seeks to attract conclusions concernign previous, current and destiny climatic switch when it comes to glaciers.

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Cuffey and Clow (1997) presented a model based on temperature, d18 O variations, and a depth-age scale in the GISP2 ice core to obtain records of temperature, rate of accumulation, and the elevation of the ice sheet over the past 50,000 years (Fig. 12). Their model indicates that the temperature increased about 15 °C from mean glacial to Holocene conditions. In addition, the average accumulation rate during the last glacial maximum (15,000-30,000 yr Bp) was around 25 per cent of the present accumulation rate, and longterm averaged accumulation rate and temperature correlate inversely over the last 7000 years.

Annual dust cycles can thus help to identify annual layers of snow deposition, which can help to date the ice core. The presence of insoluble dust in polar ice means that annual insoluble dust maxima will be preserved and not affected by diffusion processes. Dansgaard-Oeschger events recorded in the oxygen isotope signal. In the GRIP ice core, the mineralogical composition of atmospheric dust particles changes in phase with other palaeoatmospheric records (Maggi, 1997), indicating that climatic changes also affect the land surfaces of the dust source areas.

The 'year without summer' in 1816 is believed to have resulted from the 1815 Tambora eruption. It has been proposed that volcanism has had a profound effect on climate and glacier variations during the last millennium (Lamb, 1970; Baldwin et al, 1976; Mass and Schneider, 1977; Bradley, 1978, 1988; Miles and Gildersleeves, 1978; Hammer et al, 1980; Porter 1981a, 1986; Self et al, 1981; Gilliland, 1982; Rampino and Self, 1982; Kelly and Sear, 1984; LaMarche and Hirschboeck, 1984; Sear et al, 1987; Oerlemans, 1988; Bailie, 1989; Scuderi, 1990).

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