ultron
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The Stefan–Boltzmann law is incredibly accurate at predicting any planet's average surface temperature. The equation is
T = 100 * (I / (5.67 * e)) ^ 0.25
, where the output T in units K is the surface's temperature, the input I in units W/m2 is the surface's absorbed solar radiation, the input e is the surface's emissivity which is the surface's ability to emit infrared energy.
Let's try this law on planet Earth.
The albedo of Earth's surface is found to be 0.30. The Sun's incoming solar radiation is found to be 341 W/m2.
I = absorbed solar radiation = incoming solar radiation - reflected solar radiation = 341 - 341 * 0.30 = 239.
The emissivity of Earth's surface is found to be 0.612.
Input 239 for I and 0.612 for e, the equation outputs T = 100 * (239 / (5.67 * 0.612)) ^ 0.25 = 288 K, which is 15 C, which is exactly the observed value.
Alarmists assume Earth's surface is a perfect black body, so they have 1 as the value of emissivity, and they calculate Earth's surface temperature as T = 100 * (239 / (5.67 * 1)) ^ 0.25 = 255 K, which is -18 C, which is 33 C less than the observed value.
I quote
Global Warming : Feature Articles
T = 100 * (I / (5.67 * e)) ^ 0.25
, where the output T in units K is the surface's temperature, the input I in units W/m2 is the surface's absorbed solar radiation, the input e is the surface's emissivity which is the surface's ability to emit infrared energy.
Let's try this law on planet Earth.
The albedo of Earth's surface is found to be 0.30. The Sun's incoming solar radiation is found to be 341 W/m2.
I = absorbed solar radiation = incoming solar radiation - reflected solar radiation = 341 - 341 * 0.30 = 239.
The emissivity of Earth's surface is found to be 0.612.
Input 239 for I and 0.612 for e, the equation outputs T = 100 * (239 / (5.67 * 0.612)) ^ 0.25 = 288 K, which is 15 C, which is exactly the observed value.
Alarmists assume Earth's surface is a perfect black body, so they have 1 as the value of emissivity, and they calculate Earth's surface temperature as T = 100 * (239 / (5.67 * 1)) ^ 0.25 = 255 K, which is -18 C, which is 33 C less than the observed value.
I quote
This absorption and radiation of heat by the atmosphere—the natural greenhouse effect—is beneficial for life on Earth. If there were no greenhouse effect, the Earth's average surface temperature would be a very chilly -18°C (0°F) instead of the comfortable 15°C (59°F) that it is today.
Global Warming : Feature Articles
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