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Microstructure of Climate-Forcing Aerosols: Aircraft Traverses from Clean to Polluted Conditions in the Indian Ocean

Published online by Cambridge University Press:  02 July 2020

James R. Anderson  and
Peter Crozier
James R. Anderson
Affiliation:
Environmental Fluid Dynamics Program, Arizona State University
Peter Crozier
Affiliation:
Center for Solid State Science, Arizona State University
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Abstract

The Indian Ocean Experiment (INDOEX) was conducted in Feb.-Mar. 1999 in a large area of the Indian Ocean, Bay of Bengal, and Arabian Sea to investigate climate forcing produced by pollutant aerosol particles being transported out of India, Pakistan, and Indochina during the Northeast (“Dry“) Monsoon2. Pollutant aerosols can be transported a thousand km or more by prevailing winds as far south as the Inter-tropical Convergence Zone (ITCZ), the convective band that separates Northern and Southern Hemisphere tropospheric air. We present here results from TEM examination of aerosol particles collected on INDOEX research flights of the NCAR C-130 aircraft.

The climate forcing properties of sulfate aerosols over the oceans have long been recognized2. Sulfate and other particles scatter incoming solar radiation, reducing the amount of light (and heat) incident on the ocean surface and thus causing a cooling effect which may locally counter some of the warming effect due to greenhouse gases.

Type
Forensics and Environmental Issues (Organized by J. Woodward and P. Crozier)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 480 - 481
Copyright
Copyright © Microscopy Society of America 2001

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References

1.)Ramanathan, V. et al., Jour. Geophys. Res (2001) in press.Google Scholar
2.)Charlson, R. et al., Science (1992) 423–430.CrossRefGoogle Scholar
3.)Posfai, M. etal., Jour. Geophys Res. (1999) 21,685-21,693.Google Scholar
4.) Supported by NSF Atmospheric Chemistry Program, ATM-9713101Google Scholar