Willow Spring, NC City Data - Population, Homes, Statistics. Willow Spring, NC is a city with great restaurants, attractions, history and people. There are around 8,926 people who live in Willow Spring and approximately 627,846 who live in Wake County.
Snow, ice, and clouds have high albedos (typically from 0.7 to 0.9) and reflect more energy than they absorb. Earthâs average albedo is about 0.3. In other words, about 30 percent of incoming solar radiation is reflected back into space and 70 percent is absorbed. A sensor aboard NASAâs Terra satellite is now collecting detailed measurements of how much sunlight the earthâs surface reflects back up into the atmosphere.
The fraction of the total solar radiant energy reflected back to space from clouds, scattering and reflection from the Earthâs surface is called the albedo of the Earth-atmosphere system and is roughly 0.3 for the Earth as a whole.igure 2.1: The Sun's rays incident on the Earth. I0 = irradiance on a plane perpendicular to the Sun's rays. The solar constant (I SC) is the average radiation intensity falling on an imaginary surface, perpendicular to the Sunâs rays and at the edge of the Earthâs atmosphere (figure 2.1).