Agronomy 180 - Assignment 9 - part 1 and 2 | Questions And Answers Latest {2024- 2025}
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The term perihelion has Greek origins, with "peri" mean far and "hellion" for the Greek god of the sun
and it is the term used when the Earth is farthest from the Sun on its elliptical orbit. - False
Follow the steps below to calculate the change in the intensity of radiation at the top of the Earth's
atmosphere (Solar Constant) due to changes in the distance between the Earth and Sun due to changes
in the eccentricity of Earth's orbit.
Calculate the solar constant by using the following equation:
For the current orbit, the mean distance from the sun (d) is 1.5 x 1011 m. The luminosity (or power) of
the sun (L) is 3.846 x 1026 W. According to the Inverse Square Law: - Solar Constant = L/4πd²
Now Calculate the Solar Constant fo rate perihelion when he sun (d) is 1.47 x 10^11 m, the luminosity
(or power) of the sun(L) is still 3.846 x 10^26 W. - 1416 W m^-2
Now use your answer from number three to calculate the radiate equilibrium temperature at perihelion.
Use the formula below, it is a simplified version from Assignment 5.
I = Solar energy flux
𝛼 = albedo = 0.30
𝜎 = Stephan-Boltzman constan t= 5.67 X 10-8 W m-2 K-4 - Te = (((1-a)¼)/σ)^¼
Te= (((1-0.3)(1416Wm^-2/4))/5.67 x 10^-8 Wm^-2K^-4)^¼ = 257.15 K
257.15 K
Which Milankovitch cycle takes the shortest amount of time? - Precession
Models including only natural forcing can explain most of the observed global 20th century temperature
anomaly - False
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