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Coupling of latent heat flux and the greenhouse effect by large-scale tropical/subtropical dynamics diagnosed in a set of observations and model simulations

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Abstract

Coupled variability of the greenhouse effect (GH) and latent heat flux (LHF) over the tropical – subtropical oceans is described, summarized and compared in observations and a coupled ocean-atmosphere general circulation model (CGCM). Coupled seasonal and interannual modes account for much of the total variability in both GH and LHF. In both observations and model, seasonal coupled variability is locally 180° out-of-phase throughout the tropics. Moisture is brought into convergent/convective regions from remote source areas located partly in the opposite, non-convective hemisphere. On interannual time scales, the tropical Pacific GH in the ENSO region of largest interannual variance is 180° out of phase with local LHF in observations but in phase in the model. A local source of moisture is thus present in the model on interannual time scales while in observations, moisture is mostly advected from remote source regions. The latent cooling and radiative heating of the surface as manifested in the interplay of LHF and GH is an important determinant of the current climate. Moreover, the hydrodynamic processes involved in the GH–LHF interplay determine in large part the climate response to external perturbations mainly through influencing the water vapor feedback but also through their intimate connection to the hydrological cycle. The diagnostic process proposed here can be performed on other CGCMs. Similarly, it should be repeated using a number of observational latent heat flux datasets to account for the variability in the different satellite retrievals. A realistic CGCM could be used to further study these coupled dynamics in natural and anthropogenically altered climate conditions.

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Acknowledgements.

This work was realized during a visit of the first author (A.G.) to the Laboratoire de Météorologie Dynamique, Palaiseau, France under the auspices of visiting grants from both the Centre National de la Recherche Scientifique an the Institut Pierre Simon Laplace, Paris, France. Funding from National Science Foundation Grant ATM 99-01110 partially supported this work. The authors thank Drs. R. Kandel and M. Desbois for constructive discussions as well as J.-L. Monge and B. Bonnet for technical support. Two anonymous reviewers provided excellent comments and suggestions which improved the original text.

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  1. Climate Research Division, Scripps Institution of Oceanography, La Jolla, CA 92093-0224, USA

    A. Gershunov

  2. Laboratoire de Météorologie Dynamique, Ecole Polytechnique, 91128 Palaiseau, France

    R. Roca

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  1. A. Gershunov
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  2. R. Roca
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Correspondence to A. Gershunov.

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Gershunov, A., Roca, R. Coupling of latent heat flux and the greenhouse effect by large-scale tropical/subtropical dynamics diagnosed in a set of observations and model simulations. Climate Dynamics 22, 205–222 (2004). https://doi.org/10.1007/s00382-003-0376-7

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  • DOI: https://doi.org/10.1007/s00382-003-0376-7

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