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- W2892565513 abstract "Atmosphere-only CMIP5 idealized climate experiments with quadrupling of atmospheric CO 2 are analyzed to understand the fast response of the tropical overturning circulation to this forcing and the main mechanism of this response. A new metric for the circulation, based on pressure velocity in the subsidence regions, is defined, taking advantage of the dynamical stability of these regions and their reduced sensitivity to the GCM’s cloud and precipitation parameterization schemes. This definition permits us to decompose the circulation change into a sum of relative changes in subsidence area, static stability, and heating rate. A comparative analysis of aqua- and Earth-like planet experiments reveals the effect of the land–sea contrast on the total change in circulation. On average, under the influence of CO 2 increase without surface warming, the atmosphere radiatively cools less, and this drives the 3%–4% slowdown of the tropical circulation. Even in an Earth-like planet setup, the circulation weakening is dominated by the radiatively driven changes in the subsidence regions over the oceans. However, the land–sea differential heating contributes to the vertical pattern of the circulation weakening by driving the vertical expansion of the tropics. It is further found that the surface warming would, independently of the CO 2 effect, lead to up to a 12% slowdown in circulation, dominated by the enhancement of the static stability in the upper troposphere. The two mechanisms identified above combine in the coupled experiment with abrupt quadrupling, causing a circulation slowdown (focused in the upper troposphere) of up to 18%. Here, the independent effect of CO 2 has a considerable impact only at time scales less than one year, being overtaken quickly by the impact of surface warming." @default.
- W2892565513 created "2018-10-05" @default.
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- W2892565513 date "2018-12-01" @default.
- W2892565513 modified "2023-10-14" @default.
- W2892565513 title "The Fast Response of the Tropical Circulation to CO<sub>2</sub> Forcing" @default.
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- W2892565513 doi "https://doi.org/10.1175/jcli-d-18-0086.1" @default.
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