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老花木虫 (著名写手)
老花
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[求助]
照射到地面的太阳光能量的占比 已有2人参与
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请问，照射到地面的太阳光中，可见光能量占比多少？红外线能量占比多少？紫外线占比多少？其他占比多少？ 和地域有关系吗？什么因素对占比影响比较大？ |
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Reference Solar Spectral Irradiance: Air Mass 1.5 http://rredc.nrel.gov/solar/spectra/am1.5/ |
2楼2017-12-04 21:11:19
rlafite
至尊木虫 (正式写手)
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The total amount of energy received at ground level from the Sun at the zenith depends on the distance to the Sun and thus on the time of year. It is about 3.3% higher than average in January and 3.3% lower in July (see below). If the extraterrestrial solar radiation is 1367 watts per square meter (the value when the Earth–Sun distance is 1 astronomical unit), then the direct sunlight at Earth's surface when the Sun is at the zenith is about 1050 W/m2, but the total amount (direct and indirect from the atmosphere) hitting the ground is around 1120 W/m2.[5] In terms of energy, sunlight at Earth's surface is around 52 to 55 percent infrared (above 700 nm), 42 to 43 percent visible (400 to 700 nm), and 3 to 5 percent ultraviolet (below 400 nm).[6] At the top of the atmosphere, sunlight is about 30% more intense, having about 8% ultraviolet (UV),[7] with most of the extra UV consisting of biologically damaging short-wave ultraviolet.[8] Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux. This is higher than the efficacy (of source) of most artificial lighting (including fluorescent), which means using sunlight for illumination heats up a room less than using most forms of artificial lighting. |
3楼2017-12-06 04:04:12