Open Journal of Atmospheric and Climate Change

Advanced Two-Layer ClimateModel for the Assessment of Global Warming by CO2

Hermann Harde* , Experimental Physics and Materials Science , Helmut-Schmidt-University , Germany

Open Journal of Atmospheric and Climate Change, Volume 1, Number 3, pp.1-50, 2014

Keywords

Carbon Dioxide; Climate Model; Climate Sensitivity; Cloud Cover; Global Warming; Solar Activity

Abstract

We present an advanced two-layer climate model, especially appropriate to calculate the influence of an increasing CO2-concentration and a varying solar activity on global warming. The model describes the atmosphere and the ground as two layers acting simultaneously as absorbers and Planck radiators, and it includes additional heat transfer between these layers due to convection and evaporation. The model considers all relevant feedback processes caused by changes of water vapour, lapse-rate, surface albedo or convection and evaporation. In particular the influence of clouds with a thermally or solar induced feedback is investigated in some detail. The short- and long-wave absorption of the most important greenhouse gases water vapour, carbon dioxide, methane and ozone are derived from line-by-line calculations based on the HITRAN08-databasis and are integrated in the model. Simulations including an increased solar activity over the last century give a CO2 initiated warming of 0.2 ̊ C and a solar influence of 0.54 ̊ C over this period, corresponding to a CO2 climate sensitivity of 0.6 ̊ C (doubling of CO2) and a solar sensitivity of 0.5 ̊ C (0.1 % increase of the solar constant).

Cite this Article

Hermann Harde*, Advanced Two-Layer ClimateModel for the Assessment of Global Warming by CO2, Open Journal of Atmospheric and Climate Change, Volume 1, Number 3, pp.1-50, 2014.

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