Thermal Radiation Homework: Snow-Covered Surface Absorption

In summary, the amount of original shortwave radiation absorbed by the snow-covered surface can be calculated using the equation Hr = (Area)(e)(5.67x10^-8 W/m^2K^4)(temperature)^4, where the emissivity of snow ranges from 0.969 to 0.997. 50% of the solar radiation reaching the top of the atmosphere is either absorbed in the atmosphere or reflected by clouds, leaving the remaining percentage to be absorbed by the snow.
  • #1
annedi
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Homework Statement



Consider a snow-covered surface. Assume that the amount of solar radiation that reaches the top of the atmosphere is 1367 Wm-2. Given that 50% of this solar radiation is either absorbed in the atmosphere or reflected by clouds before reaching the the snow covered surface, how much of the original shortwave radiation is absorbed by the snow?

Homework Equations


Hr= (Area)(e)(5.67x10^-8 W/m^2K^4)(temperature)^4

The Attempt at a Solution


I seriously don't know how to.. please help me..
 
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  • #2
What is "emissivity" of snow?
 
  • #3
Bystander said:
What is "emissivity" of snow?

I searched it. it says that it ranges from 0.969 - 0.997
 

1. What is thermal radiation?

Thermal radiation is the emission of electromagnetic waves from an object due to its temperature. This radiation includes infrared, visible, and ultraviolet light. All objects with a temperature above absolute zero emit thermal radiation.

2. How does thermal radiation affect snow-covered surfaces?

Snow-covered surfaces absorb and emit thermal radiation differently than non-snow-covered surfaces. The high reflectivity of snow causes it to absorb less thermal radiation from the sun, resulting in a lower temperature compared to other surfaces. However, snow also has a high emissivity, meaning it emits thermal radiation at a higher rate, resulting in a faster cooling process.

3. Why is understanding snow-covered surface absorption important?

Understanding snow-covered surface absorption is important for various reasons. It can help predict temperature changes in areas with snow, which can affect ecosystems and human activities such as agriculture and transportation. It also plays a role in climate change research, as snow-covered surfaces can contribute to changes in Earth's energy balance.

4. How can we measure the absorption of thermal radiation on snow-covered surfaces?

The absorption of thermal radiation on snow-covered surfaces can be measured using instruments such as radiometers or spectrometers. These devices measure the intensity of electromagnetic radiation emitted by the snow and can provide data on the absorption and emission rates of thermal radiation.

5. What are some factors that can affect snow-covered surface absorption?

Factors that can affect snow-covered surface absorption include the thickness and density of the snow, the angle of the sun's rays, and the presence of impurities in the snow such as dust or pollutants. Additionally, the type of snow (e.g. fresh, compacted) can also impact its absorption of thermal radiation.

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