Mechanism of Fast Atmospheric Energetic Equilibration Following Radiative Forcing by CO2
Author(s): Dinh, Tra; Fueglistaler, Stephan
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Abstract: | In energetic equilibrium, the atmosphere's net radiative divergence (R) is balanced by sensible (S) and latent (L) heat fluxes, i.e., R+S+L=0. Radiative forcing from increasing CO2 reduces R, and the surface warming following an increase in CO2 is largely due to the reduction in atmospheric energy demand in S and L, with only a smaller surface radiative budget perturbation. With an idealized General Circulation Model, we show that the fast atmospheric adjustment at fixed surface temperature produces the required decrease in the sum of S and L through changes in the near-surface temperature and specific humidity. In layers near the surface, the reduced radiative cooling forces a temperature increase that leads to a negative Planck radiative feedback and, because of the reduced surface-atmosphere temperature difference, also to a reduction in sensible heat flux. In the free troposphere, the reduced radiative cooling leads to a weakening of the tropospheric circulation. Consequently, there is a decrease in the water flux exported from the layers near the surface, and as such in precipitation. By mass conservation, the near-surface specific humidity increases and surface evaporation decreases until it balances the reduced export flux. Other processes can amplify or dampen the responses in S and L and change the partitioning between these two fluxes, but by themselves do not ensure R+L+S=0. |
Publication Date: | 25-Sep-2017 |
Electronic Publication Date: | 10-Nov-2017 |
Citation: | Dinh, Tra, and S. Fueglistaler. "Mechanism of fast atmospheric energetic equilibration following radiative forcing by CO2." Journal of Advances in Modeling Earth Systems 9, no. 7 (2017): 2468-2482. doi:10.1002/2017MS001116. |
DOI: | doi:10.1002/2017MS001116 |
EISSN: | 1942-2466 |
Pages: | 2468 - 2482 |
Type of Material: | Journal Article |
Journal/Proceeding Title: | Journal of Advances in Modeling Earth Systems |
Version: | Final published version. This is an open access article. |
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