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By National Research Council, Division on Earth and Life Studies, Environment and Resources Commission on Geosciences, Panel on Aerosol Radiative Forcing and Climate Change

ISBN-10: 030905429X

ISBN-13: 9780309054294

Panel on Aerosol Radiative Forcing and weather switch, setting and assets fee on Geosciences, department on the earth and lifestyles stories, nationwide examine Council

This ebook recommends the initiation of an "integrated" examine software to review the function of aerosols within the expected worldwide weather switch. present knowing recommend that, even now, aerosols, essentially from anthropogenic resources, can be lowering the speed of warming attributable to greenhouse gasoline emissions. as well as particular examine concepts, this ebook forcefully argues for 2 forms of examine software integration: integration of the person laboratory, box, and theoretical learn actions and an built-in administration constitution that consists of the entire involved federal enterprises.

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5-µm diameter particles can significantly enhance precipitation. , 1995). For continental conditions, in which the susceptibility to albedo modification by increase in precursor CCN concentrations is, in any case, low (cf. Twomey, 1991), increasing anthropogenic emissions may or may not lead to increases in low cloud extent, or cloud albedo. About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files.

In contrast, forcing by anthropogenic aerosol occurs mostly by day, is strongest without clouds, and because of the relatively short residence time of aerosols, is concentrated near aerosol sources. 2. Most GHGs have lifetimes in air very long compared with lifetimes of aerosols. For example, the current, enhanced level of CO2 represents an accumulation of many decades of emission, whereas the current anthropogenic aerosol derives from emissions during only the previous few days. EVIDENCE FOR RADIATIVE FORCING BY ANTHROPOGENIC AEROSOLS The first question the panel addressed was: is anthropogenic aerosol forcing of climate a sufficiently important element of the overall climate system, such that its uncertainty is limiting our ability to quantitatively assess the effect of anthropogenic emissions on climate change?

Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted. Please use the print version of this publication as the authoritative version for attribution. CLIMATE FORCING BY AEROSOLS 18 to identified industrial sources (Mészáros, 1992). Warner and Twomey (1967) found that the number concentration in clouds downwind of sugar cane fires averaged 510 cm-3, compared with a concentration of 104 cm-3 in the upwind maritime air.

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A Plan for a Research Program on Aerosol Radiative Forcing and Climate Change by National Research Council, Division on Earth and Life Studies, Environment and Resources Commission on Geosciences, Panel on Aerosol Radiative Forcing and Climate Change


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