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alexira [117]
3 years ago
8

2 1. Scattering cross-section of acrosol particles is 2.5E-12 m , absorption cross-section is 0.45E- .2 12 m Concentration of pa

rticles is N 2E7 1/m. Calculate the optical thickness and transmittance of atmosphere at this wavelength if sun zenith angle is 40 degrees and the thickness of aerosol layer is 2.5 km.
Geography
1 answer:
Alona [7]3 years ago
6 0

Answer:

T = 3.23 \times 10^{-83}

Explanation:

thickness of aerosol layer is 2.5 km

zenith angle is 40 degree

we know that

\tau = \epsilon_{ext} . h

where

\epsilon_{ext} = N.\sigma_{ext}

\epsilon_{ext} is extinction coefficient

\sigma_{ext} extiction cross section

N = Concentration

\sigma_{ext} = (2.5 + 0.45)\times 10^{-12} m^2

                     = 2.95 \times 10^{-12} m^2

\epsilon_{ext} = 2\times 10^7 \times 2.95 \times 10^{-12} m^2 \times m^{-3}

                       = 5.9 \times 10^{-5} m^{1}

\tau = 5.9 \times 10^{-5} m^{-1}  \times 2.5\times 10^3 m

        = 14.75\times 10^{-2}

transimiitance T  = e^{\frac{-\tau}{\mu}}

                       T  = e^{\frac{- 14.75 \times 10^{-2}}{cos 40}}

T = 3.23 \times 10^{-83}

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