Photophoretic levitation of engineered aerosols for geoengineering
Open Access
- 7 September 2010
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 107 (38), 16428-16431
- https://doi.org/10.1073/pnas.1009519107
Abstract
Aerosols could be injected into the upper atmosphere to engineer the climate by scattering incident sunlight so as to produce a cooling tendency that may mitigate the risks posed by the accumulation of greenhouse gases. Analysis of climate engineering has focused on sulfate aerosols. Here I examine the possibility that engineered nanoparticles could exploit photophoretic forces, enabling more control over particle distribution and lifetime than is possible with sulfates, perhaps allowing climate engineering to be accomplished with fewer side effects. The use of electrostatic or magnetic materials enables a class of photophoretic forces not found in nature. Photophoretic levitation could loft particles above the stratosphere, reducing their capacity to interfere with ozone chemistry; and, by increasing particle lifetimes, it would reduce the need for continual replenishment of the aerosol. Moreover, particles might be engineered to drift poleward enabling albedo modification to be tailored to counter polar warming while minimizing the impact on equatorial climates.This publication has 25 references indexed in Scilit:
- Experiments on negative photophoresis and application to the atmosphereAtmospheric Environment, 2008
- Exploring the geoengineering of climate using stratospheric sulfate aerosols: The role of particle sizeGeophysical Research Letters, 2008
- Contributions to accelerating atmospheric CO 2 growth from economic activity, carbon intensity, and efficiency of natural sinksProceedings of the National Academy of Sciences of the United States of America, 2007
- Effects of Mount Pinatubo volcanic eruption on the hydrological cycle as an analog of geoengineeringGeophysical Research Letters, 2007
- Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1)Proceedings of the National Academy of Sciences of the United States of America, 2006
- Gravito-photophoresis and aerosol stratification in the atmosphereJournal of Aerosol Science, 2005
- Constraints on meridional transport in the stratosphere imposed by the mean age of air in the lower stratospherePublished by American Geophysical Union (AGU) ,2001
- Vertical transport of anthropogenic soot aerosol into the middle atmospherePublished by American Geophysical Union (AGU) ,2000
- A comparison of ground level solar radiative effects of recent volcanic eruptionsAtmospheric Environment, 1999
- Photophoretic Effects in the StratosphereJournal of the Atmospheric Sciences, 1964