- 10-195 Kiro Miyazaki
- An Explanation of Global Warming without Supercomputing (revised version)
Dec 4, 10
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Abstract. A new analytic solution of the radiative transfer equation is proposed. It is an extension of the semi-gray model developed by Weaver and Ramanathan. We consider the two regions of thermal spectra independently. In the first the infrared absorption (or radiation) is only due to water vapor. In the second both water vapor and carbon dioxide are active. The pre-industrial values of the corresponding two optical depths are determined so as to reproduce the global average temperature and the infrared spectrum observed by satellite spectrometer. Then, assuming that the optical depth of carbon dioxide is proportional to its concentration but the optical depth of water vapor is invariable, we can reproduce the climate change after 1850 AD fairly well. Consequently, it is found that the climate sensitivity never exceeds 6C. The result is consistent to recent investigations. It is therefore concluded that the anthropogenic global warming is severely limited because the Earth is a water planet.