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1. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun with F0= 1850 W/m²/um. At one point with cloudy sky and aerosol plume under the cloud, it measures an irradiance of I1 W/m²/um. When the cloud passes this increases to I2 W/m²/um and when there were no aerosols, the irradiance became 13 W/m²/um. Assuming sun zenith angle 0 degrees: a) What is the optical depth of the cloud? b) If the cloud would be twice thinner, what intensity would the sunphotometer measures when the cloud was overhead? What is the transmittance for this case? c) What are the optical thicknesses of aerosol and Rayleigh scattering components?

1. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun with F0= 1850 W/m²/um. At one point with cloudy sky and aerosol plume under the cloud, it measures an irradiance of I1 W/m²/um. When the cloud passes this increases to I2 W/m²/um and when there were no aerosols, the irradiance became 13 W/m²/um. Assuming sun zenith angle 0 degrees: a) What is the optical depth of the cloud? b) If the cloud would be twice thinner, what intensity would the sunphotometer measures when the cloud was overhead? What is the transmittance for this case? c) What are the optical thicknesses of aerosol and Rayleigh scattering components?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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E1= 105

E2= 92

Angle = 41

Tr= 0.15

Ta= 0.25

1. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun with F0 = 1850 W/m²/um. At one point with cloudy sky and aerosol plume under the cloud, it measures an irradiance of I1 W/m²/um. When the cloud passes this increases to 12 W/m²/um and when there were no aerosols, the irradiance became 13 W/m²/um. Assuming sun zenith angle 0 degrees: a) What is the optical depth of the cloud? b) If the cloud would be twice thinner, what intensity would the sunphotometer measures when the cloud was overhead? What is the transmittance for this case? c) What are the optical thicknesses of aerosol and Rayleigh scattering components?
Transcribed Image Text:1. A sunphotometer is an instrument that looks at visible light coming in a straight line directly from the sun with F0 = 1850 W/m²/um. At one point with cloudy sky and aerosol plume under the cloud, it measures an irradiance of I1 W/m²/um. When the cloud passes this increases to 12 W/m²/um and when there were no aerosols, the irradiance became 13 W/m²/um. Assuming sun zenith angle 0 degrees: a) What is the optical depth of the cloud? b) If the cloud would be twice thinner, what intensity would the sunphotometer measures when the cloud was overhead? What is the transmittance for this case? c) What are the optical thicknesses of aerosol and Rayleigh scattering components?
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