Publication Abstracts

Menzel and Merlis 2019

Menzel, M.E., and T.M. Merlis, 2019: Connecting direct effects of CO2 radiative forcing to ocean heat uptake and circulation. J. Adv. Model. Earth Syst., 11, no. 7, 2163-2176, doi:10.1029/2018MS001544.

The ocean's response to direct atmospheric effects of increased carbon dioxide's (CO2) radiative forcing is examined. These direct effects are defined as the climate changes that result from forcing on a fast time scale of about a year, independent of the slower surface warming that the forcing also provokes. To evaluate how these direct effects impact ocean heat uptake and circulation, output of atmospheric general circulation model (GCM) simulations are used to force an ocean GCM with comprehensive boundary conditions. Perturbation simulations with the prescribed response to a quadrupling of atmospheric CO2 include altered surface winds, freshwater fluxes, downwelling shortwave radiation, and downwelling longwave cloud radiative effect. The perturbation simulations show that the intensification and poleward shift of surface winds, particularly in the Southern Ocean, strengthen the shallow overturning circulation in the tropical Pacific and deep overturning in the Atlantic. This, in turn, has a cooling effect on the global ocean at shallow depths. A two-layer energy balance model, designed to capture transient global mean climate change, is adapted to account for the altered ocean heat uptake from direct effects. The direct change in global mean ocean heat uptake is a decrease of about 0.3 W/m2 for quadrupling of CO2, offsetting about 5% of the surface longwave forcing.

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BibTeX Citation

  author={Menzel, M. E. and Merlis, T. M.},
  title={Connecting direct effects of CO2 radiative forcing to ocean heat uptake and circulation},
  journal={J. Adv. Model. Earth Syst.},

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RIS Citation

ID  - me01300f
AU  - Menzel, M. E.
AU  - Merlis, T. M.
PY  - 2019
TI  - Connecting direct effects of CO2 radiative forcing to ocean heat uptake and circulation
JA  - J. Adv. Model. Earth Syst.
VL  - 11
IS  - 7
SP  - 2163
EP  - 2176
DO  - 10.1029/2018MS001544
ER  -

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