On the Radiative and Dynamical Feedbacks over the Equatorial Pacific Cold Tongue De-Zheng Sun John Fasullo Tao Zhang Andres Roubicek J. Climate, 2003,

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Presentation transcript:

On the Radiative and Dynamical Feedbacks over the Equatorial Pacific Cold Tongue De-Zheng Sun John Fasullo Tao Zhang Andres Roubicek J. Climate, 2003, Vol. 16, 冷舌

The equatorial cold tongue

Walker Circulation

Solar radiation Outgoing Longwave Radiation Surface heat flux into the ocean Net radiative flux

S: the net solar radiation Sc: the clear-sky solar radiation Cs: the shortwave forcing of clouds F: the outgoing longwave radiation E: the surface emission G: the total greenhouse effect Ga: the greenhouse effect of water vapor Cl: the greenhouse effect of clouds Da: the vertically integrated, horizontal convergence of total energy Fs: the net surface heat flux into the ocean

The model data of CCM3 VS the Earth Radiation Budget Experiment(ERBE) The equatorial cold tongue

SST Anomaly The greenhouse effect of water vapor Da Observation Model Observation Model Cs Cl El Nino warming La Nina cooling JAN JAN JAN JAN

高雲低雲中雲觀測模式

相加

觀測模式

The results show that the net atmospheric feedback in the CCM3 over the equatorial Pacific cold tongue region is strongly positive (5.1 W M -2 K -1 ), while the net atmospheric feedback in the real atmosphere is strongly negative (-6.4 W M -2 K -1 ).

This discrepancy is largely due to errors in cloud feedbacks The positive feedback from the greenhouse effect of clouds in the model is significantly larger than the observed, while the negative feedback from the solar forcing of clouds in the model is significantly weaker.