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Right after a rain shower, there is almost no aerosol in the air. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun. A one point it measures an intensity of 120 W/m², but when a cloud passes overhead this drops to 80 W/m². Assuming sun zenith angle 40 degrees: a) What is the optical depth of the cloud? b) If the cloud was twice as thick, what intensity would the sunphotometer measures when the cloud passed overhead? c) Calculate the transmittance for case (b) if Rayleigh and aerosol scattering are also present with optical thicknesses 0.1 and 0.2 respectively..

Right after a rain shower, there is almost no aerosol in the air. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun. A one point it measures an intensity of 120 W/m², but when a cloud passes overhead this drops to 80 W/m². Assuming sun zenith angle 40 degrees: a) What is the optical depth of the cloud? b) If the cloud was twice as thick, what intensity would the sunphotometer measures when the cloud passed overhead? c) Calculate the transmittance for case (b) if Rayleigh and aerosol scattering are also present with optical thicknesses 0.1 and 0.2 respectively..

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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Right after a rain shower, there is almost no aerosol in the air. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun. At one point it measures an intensity of 120 W/m², but when a cloud passes overhead this drops to 80 W/m². Assuming sun zenith angle 40 degrees: a) What is the optical depth of the cloud? b) If the cloud was twice as thick, what intensity would the sunphotometer measures when the cloud passed overhead? c) Calculate the transmittance for case (b) if Rayleigh and aerosol scattering are also present with optical thicknesses 0.1 and 0.2 respectively.
Transcribed Image Text:Right after a rain shower, there is almost no aerosol in the air. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun. At one point it measures an intensity of 120 W/m², but when a cloud passes overhead this drops to 80 W/m². Assuming sun zenith angle 40 degrees: a) What is the optical depth of the cloud? b) If the cloud was twice as thick, what intensity would the sunphotometer measures when the cloud passed overhead? c) Calculate the transmittance for case (b) if Rayleigh and aerosol scattering are also present with optical thicknesses 0.1 and 0.2 respectively.
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