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Joined: 10 Aug 2007
Posts: 128
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Seen recently:
http://www.nature.com/ngeo/journal/vaop/ncurrent/abs/ngeo156.html
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Nature Geoscience
Published online: 23 March 2008 | doi:10.1038/ngeo156
Global and regional climate changes due to black carbon
V. Ramanathan & G. Carmichael
Abstract
Black carbon in soot is the dominant absorber of visible solar radiation in the atmosphere. Anthropogenic sources of black carbon, although distributed globally, are most concentrated in the tropics where solar irradiance is highest. Black carbon is often transported over long distances, mixing with other aerosols along the way. ...
.... In the Himalayan region, solar heating from black carbon at high elevations may be just as important as carbon dioxide in the melting of snowpacks and glaciers. The interception of solar radiation by atmospheric brown clouds leads to dimming at the Earth's surface with important implications for the hydrological cycle, and the deposition of black carbon darkens snow and ice surfaces, which can contribute to melting, in particular of Arctic sea ice. |
And
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Scafetta, N., and B. J. West (2007), Phenomenological reconstructions of the solar signature in the Northern Hemisphere Surface temperature records since 1600, J. Geophys. Res., 112, D24S03, doi:10.1029/ 2007JD008437.
A phenomenological thermodynamic model is adopted to estimate the relative contribution of the solar-induced versus anthropogenic- added climate forcing during the industrial era. We compare different preindustrial temperature and solar data reconstruction scenarios since 1610. We argue that a realistic climate scenario is the one described by a large preindustrial secular variability (as the one shown by the
paleoclimate temperature reconstruction by Moberg et al. (2005)) with the total solar irradiance experiencing low secular variability (as the one shown by Wang et al. (2005)).
Under this scenario the Sun might have contributed up to approximately 50% (or more if ACRIM total solar irradiance satellite composite (Willson and Mordvinov, 2003) is implemented) of the observed global warming since 1900. |
http://www.agu.org/pubs/crossref/2006/2006GL027142.shtml |
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