Journal
SCIENCE
Volume 328, Issue 5983, Pages 1266-1268Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1183260
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Funding
- NASA [NNX08AG93G]
- NASA [NNX08AG93G, 101213] Funding Source: Federal RePORTER
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The Archean Earth (3.8 to 2.5 billion years ago) was probably enshrouded by a photochemical haze composed of fractal aggregate hydrocarbon aerosols. The fractal structure of the aerosols would have had a strong effect on the radiative properties of the haze. In this study, a fractal aggregate haze was found to be optically thick in the ultraviolet wavelengths while remaining relatively transparent in the mid-visible wavelengths. At an annual production rate of 10(14) grams per year and an average monomer radius of 50 nanometers, the haze would have provided a strong shield against ultraviolet light while causing only minimal antigreenhouse cooling.
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