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|a Low simulated radiation limit for runaway greenhouse climates |h [electronic resource]. |
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|a Nature Geoscience- Volume 6. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a The atmospheres of terrestrial planets are expected to be in long-term radiation balance: an increase in the absorption of
solar radiation warms the surface and troposphere, which leads to a matching increase in the emission of thermal radiation.
Warming a wet planet such as Earth would make the atmosphere moist and optically thick such that only thermal radiation
emitted from the upper troposphere can escape to space. Hence, for a hot moist atmosphere, there is an upper limit on the
thermal emission that is unrelated to surface temperature. If the solar radiation absorbed exceeds this limit, the planet will heat
uncontrollably and the entire ocean will evaporate—the so-called runaway greenhouse. Here we model the solar and thermal
radiative transfer in incipient and complete runaway greenhouse atmospheres at line-by-line spectral resolution using a modern
spectral database.We find a thermal radiation limit of 282Wm2 (lower than previously reported) and that 294Wm2 of solar
radiation is absorbed (higher than previously reported). Therefore, a steam atmosphere induced by such a runaway greenhouse
may be a stable state for a planet receiving a similar amount of solar radiation as Earth today. Avoiding a runaway greenhouse
on Earth requires that the atmosphere is subsaturated withwater, and that the albedo effect of clouds exceeds their greenhouse
effect. A runaway greenhouse could in theory be triggered by increased greenhouse forcing, but anthropogenic emissions are
probably insufficient. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15060336/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/03/36/00001/FI15060336_thm.jpg |
