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Environmental magnetism and climate change.

Maher, Barbara A (2007) Environmental magnetism and climate change. Contemporary Physics, 48 (5). pp. 247-274. ISSN 0010-7514

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Abstract

A major and pressing problem is to understand how, and how fast, the Earth’s climate has changed in the past, with and without human influences on the global carbon cycle. Magnetic, remanence-acquiring, minerals, mostly iron oxides and sulphides, occur ubiquitously in sediments. They can act as sensitive recorders of past climates, because as climate has varied (from glacial to interglacial, for example), the mineralogy, magnetic domain state, composition and source of these minerals has varied. Here, the magnetic properties of windblown dust and interbedded soil layers of the Chinese Loess Plateau are used to calculate rainfall for the last million years, identifying the waxing and waning of the southeast Asian summer monsoon. Comparison of our magnetic rainfall record on land with environmental records from the deep-sea shows that summer monsoon intensity is linked with growth and decay of continental-sized ice sheets, in turn reflecting changes in the Earth’s orbit around the Sun.

Item Type: Article
Journal or Publication Title: Contemporary Physics
Uncontrolled Keywords: climate change ; environmental magnetism ; magnetite ; magnetic domains
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 8477
Deposited By: Professor Barbara A Maher
Deposited On: 13 Jun 2008 11:00
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:23
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8477

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