446_01c_test4_practice

446_01c_test4_practice - emissivity? 5) For which of the...

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Sample problems for test # 4 1) If the ground behaves as a black-body, will the net irradiance between the ground and an overlying cooler cloud be greater if the cloud is a black-body or a gray-body? You can assume that no significant absorption (or scattering or anything else) occurs in between the ground and the cloud. Assume that the temperature of the ground and the cloud is the same in both cases. 2) If the net irradiance between the 18 o C ground and an overlying cloud is 64 W/m 2 , what is the temperature of the cloud? Assume both the cloud and ground have a reflectance of 0.15. 3) If the monochromatic irradiance of a blackbody is 1.8x10 6 W m -2 µ m -1 , what is its monochromatic radiance at the same wavelength? 4) Before turning to flux emissivity, the derived expression that could be used to determine the downward irradiance incident upon a reference height in the atmosphere was: ∫∫∫ Θ Θ Θ = λ π d du d u L E ) sec exp( sin 2 * Specifically what about this was so complicated that we abandoned it and moved to flux
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Unformatted text preview: emissivity? 5) For which of the absorption spectra shown below would the use of flux emissivity be most applicable, and why? E 0.1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 2 3 ( m) 250 K 300 K Black-body r Absorption spectra 1 adiation Absorption spectra 2 a a 6) Although we have focused mostly on absorption of long-wave radiation in the atmosphere by water vapor, a number of other gas species are also responsible for long-wave absorption (and emission). Name two of them. 7) Why isnt photolysis of O 2 a significant source of oxygen atoms (and ultimately ozone) in the troposphere? What is a significant source of oxygen atoms in the troposphere? 8) All else being equal, how would an increase in the overall gas density (i.e., concentration of M) affect the equilibrium ozone concentration? 9) What role do polar stratospheric clouds play in ozone destruction?...
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446_01c_test4_practice - emissivity? 5) For which of the...

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