Daily Archives: June 14, 2017

Extreme Weather is Becoming Less Common in the United States

“Over the past century, the frequency of both very hot and very cold days has plummeted in the US. ” click here

Equilibrium Climate Sensitivity Cs = 0.7 degC

Hermann Harde.ย Radiation Transfer Calculations and Assessment of Global Warming by CO2.ย International Journal of Atmospheric Sciences Volume 2017, Article ID 9251034, 30 pages https://doi.org/10.1155/2017/9251034

We present detailed line-by-line radiation transfer calculations, which were performed under different atmospheric conditions for the most important greenhouse gases water vapor, carbon dioxide, methane, and ozone. Particularly cloud effects, surface temperature variations, and humidity changes as well as molecular lineshape effects are investigated to examine their specific influence on some basic climatologic parameters like the radiative forcing, the long wave absorptivity, and back-radiation as a function of an increasing CO2 concentration in the atmosphere. These calculations are used to assess the CO2 global warming by means of an advanced two-layer climate model and to disclose some larger discrepancies in calculating the climate sensitivity. Including solar and cloud effects as well as all relevant feedback processes our simulations give an equilibrium climate sensitivity of ๐ถ๐‘† = 0.7โˆ˜ C (temperature increase at doubled CO2) and a solar sensitivity of ๐‘†๐‘† = 0.17โˆ˜ C (at 0.1% increase of the total solar irradiance). Then CO2 contributes 40% and the Sun 60% to global warming over the last century.