All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 10468 3542 263
PDF Downloads 10457 3332 243

The Effects of Doubling the CO2 Concentration on the climate of a General Circulation Model

Syukuro ManabeGeophysical Fluid Dynamics Laboratory/NOAA, Princeton University, Princeton, N.J. 08540

Search for other papers by Syukuro Manabe in
Current site
Google Scholar
PubMed
Close
and
Richard T. WetheraldGeophysical Fluid Dynamics Laboratory/NOAA, Princeton University, Princeton, N.J. 08540

Search for other papers by Richard T. Wetherald in
Current site
Google Scholar
PubMed
Close
Full access

Abstract

An attempt is made to estimate the temperature changes resulting from doubling the present CO2 concentration by the use of a simplified three-dimensional general circulation model. This model contains the following simplications: a limited computational domain, an idealized topography, no beat transport by ocean currents, and fixed cloudiness. Despite these limitations, the results from this computation yield some indication of how the increase of CO2 concentration may affect the distribution of temperature in the atmosphere. It is shown that the CO2 increase raises the temperature of the model troposphere, whereas it lowers that of the model stratosphere. The tropospheric warming is somewhat larger than that expected from a radiative-convective equilibrium model. In particular, the increase of surface temperature in higher latitudes is magnified due to the recession of the snow boundary and the thermal stability of the lower troposphere which limits convective beating to the lowest layer. It is also shown that the doubling of carbon dioxide significantly increases the intensity of the hydrologic cycle of the model.

Abstract

An attempt is made to estimate the temperature changes resulting from doubling the present CO2 concentration by the use of a simplified three-dimensional general circulation model. This model contains the following simplications: a limited computational domain, an idealized topography, no beat transport by ocean currents, and fixed cloudiness. Despite these limitations, the results from this computation yield some indication of how the increase of CO2 concentration may affect the distribution of temperature in the atmosphere. It is shown that the CO2 increase raises the temperature of the model troposphere, whereas it lowers that of the model stratosphere. The tropospheric warming is somewhat larger than that expected from a radiative-convective equilibrium model. In particular, the increase of surface temperature in higher latitudes is magnified due to the recession of the snow boundary and the thermal stability of the lower troposphere which limits convective beating to the lowest layer. It is also shown that the doubling of carbon dioxide significantly increases the intensity of the hydrologic cycle of the model.

Save