globalatmos2 - Global Atmospheric Changes Lecture13 Part2...

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Global  Atmospheric Changes Lecture 13 Part 2
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Solar energy intercepted by Earth within this band Electromagneti c Spectrum  Shorter wavelengths Longer wavelengths
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Earth’s Radiation Balance Solar energy is either absorbed or reflected 56% reaches ground  surface Energy inwards is  mainly shortwave and  energy out mainly  longwave  Inward energy receipts  balanced by outward  energy losses
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Shortwave and Longwave Radiation Some of the shortwave radiation absorbed by Earth is  emitted as longwave radiation – heat The atmosphere traps some of this longwave radiation, becoming warmer
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Albedo • Reflectivity of a surface • Light land surfaces have higher albedo and lower absorption  than dark surfaces • Naturally vegetated surfaces usually have a lower albedo  than surfaces cleared of vegetation • Alteration of albedo may alter regional climate
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Albedo Values for Selected Land Surfaces (in Rank Order, High to Low) Snow 75-95% Dry sand 35-45% Wet sand 20-30% Dry earth 15-25% Deciduous forest 10-20% Pasture (fields) 10-20% Wet soil 10% Coniferous forest 5-15% Blacktop road
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Naturally Occurring Greenhouse Gases Carbon Dioxide – C02 Water Vapor - H20 Methane – CH4 Nitrous Oxide – N2O Except for water vapor, these comprise less  than 0.1% of the atmosphere
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Gaseous Composition of the Lower Troposphere In baseline  quantities, naturally occurring  greenhouse gases  are vital to life on  Earth They warm Earth by  60 degrees F Without them, most  of Earth would be  frozen
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globalatmos2 - Global Atmospheric Changes Lecture13 Part2...

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