Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 39, Issue -, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2012GL053115
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Funding
- National Science Foundation
- [AGS-0960497]
- [ATM-0846641]
- [ATM-0936059]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0936059] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0960497] Funding Source: National Science Foundation
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Substantial biases in shortwave cloud forcing (SWCF) of up to +/- 30 W m(-2) are found in the midlatitudes of the Southern Hemisphere in the historical simulations of 34 CMIP5 coupled general circulation models. The SWCF biases are shown to induce surface temperature anomalies localized in the midlatitudes, and are significantly correlated with the mean latitude of the eddy-driven jet, with a negative SWCF bias corresponding to an equatorward jet latitude bias. Aquaplanet model experiments are performed to demonstrate that the jet latitude biases are primarily induced by the midlatitude SWCF anomalies, such that the jet moves toward (away from) regions of enhanced (reduced) temperature gradients. The results underline the necessity of accurately representing cloud radiative forcings in state-of-the-art coupled models. Citation: Ceppi, P., Y.-T. Hwang, D. M. W. Frierson, and D. L. Hartmann (2012), Southern Hemisphere jet latitude biases in CMIP5 models linked to shortwave cloud forcing, Geophys. Res. Lett., 39, L19708, doi:10.1029/2012GL053115.
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