1.RADIATION - ES8007 Climate and Climate Change ES1007...

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www.earthobservator y.sg ES8007 Climate and Climate Change ES1007 Oceans, Atmosphere and Climate © NEA-MSS Radiation- Part I Asst. Prof. WANG Xianfeng Asian School of the Environment Nanyang Technological University 12 January, 2016
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www.earthobservator y.sg Blackbody Radiation 12 January, 2016 All objects emit radiation as long as they have a non-zero temperature on the k elvin (K) scale. x °C = (273.15 + x ) K Modified from http://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Black_body.svg/303px-Black_body.svg.png The radiative power is distributed in the form of Planck’s blackbody radiation curve across different wavelengths of light. As the temperature increases, more radiative power is emitted; the radiative power peaks at shorter wavelengths. What is the surface temperature of the Sun?
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www.earthobservator y.sg Solar vs. Terrestrial Radiation 12 January, 2016 . . . 100 The Sun is at about 6000 K while the Earth ( as seen from space ) averages about 263 K . The peak solar radiation lies in the visible spectrum spanning 390 – 700 nm. The peak terrestrial radiation lies in the infrared spectrum around 10 µm. The observed solar and terrestrial spectra show significant departures from blackbody radiation curves.
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www.earthobservator y.sg Atmospheric Absorption 12 January, 2016 Gases in the atmosphere absorb strongly in the ultraviolet, visible and infrared spectral bands. This is especially true of trace gases with molecules comprising three or more atoms because they resonate well with the light waves: E.g. water vapour H 2 O, carbon dioxide CO 2 , methane CH 4 , … http://www.drcruzan.com/Images/Water/WaterRotations.png http://th.physik.uni-frankfurt.de/~scherer/Blogging/ColourWater/watermodes.png vibration modes rotation modes Resonant modes of the water molecule to infrared radiation. GREENHOUSE GASES
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www.earthobservator y.sg Well-Known Absorption Bands 12 January, 2016 . . . 100 Ozone absorbs in the visible, ultraviolet and near infrared bands. Oxygen absorbs in the visible and near infrared bands. Water vapour absorbs in the near and far infrared bands. Carbon dioxide absorbs in the infrared band around 14 µm .
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www.earthobservator y.sg Important Greenhouse Gases 12 January, 2016 Water vapour is the most abundant greenhouse gas in the troposphere (about 1% – 4% by volume). It absorbs most of the infrared radiation emitted by the Earth’s surface and atmosphere.
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