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Anti-greenhouse effect : ウィキペディア英語版 | Anti-greenhouse effect
The anti-greenhouse effect is a neologism used to refer to two different effects that describe a cooling effect an atmosphere has on the ambient temperature of a planet. Unlike the greenhouse effect, which is common, an anti-greenhouse effect is only known to exist in one situation in the Solar System. The conventional greenhouse effect occurs because an atmosphere is largely transparent to solar radiation, but largely opaque to infrared. In an anti-greenhouse effect, an atmosphere is opaque to solar, but releases infrared. ==Titan==
The haze containing organic molecules in Titan's upper atmosphere absorbs 90% of the solar radiation reaching Titan, but is inefficient at trapping infrared radiation generated by the surface. Although a large greenhouse effect does keep Titan at a much higher temperature than the thermal equilibrium,〔 See also McKay, ""Titan: Greenhouse and Anti-greenhouse," ''(Astrobiology Magazine )'' November 03, 2005 (retrieved October 3, 2008)〕 according to McKay ''et al.,'' "the anti-greenhouse effect on Titan reduces the surface temperature by 9 K whereas the greenhouse effect increases it by 21 K. The net effect is that the surface temperature (94 K) is 12 K warmer than the effective temperature 82 K. (the equilibrium that would be reached in the absence of any atmosphere )"〔 In addition, this effect results in a permanent meteorological inversion of the thermocline on Titan with atmospheric temperatures increasing with increasing altitude above the tropopause.〔(Temperature Lapse Rate and Methane in Titan’s Troposphere )〕 This type of anti-greenhouse effect is only known to occur on Titan, but it is similar to the cooling effects suggested for nuclear winter.〔"A Nuclear Winter's Tale By Lawrence Badas" pg 184〕〔(William R. Cotton, Roger A. Pielke, Sr Cambridge University Press, 2007, pg 216 )〕
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