Articles | Volume 19, issue 8
Atmos. Chem. Phys., 19, 5635–5660, 2019
Atmos. Chem. Phys., 19, 5635–5660, 2019

Research article 30 Apr 2019

Research article | 30 Apr 2019

Heuristic estimation of low-level cloud fraction over the globe based on a decoupling parameterization

Sungsu Park and Jihoon Shin

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Cited articles

Albrecht, B. A., Betts, A. K., Schubert, W. H., and Cox, S. K.: Model of the thermodynamic structure of the trade-wind boundary layer: Part I. Theoretical formulation and sensitivity tests, J. Atmos. Sci., 36, 73–89, 1979. a
Augstein, E., Schmidt, H., and Ostapoff, F.: The vertical structure of the atmospheric planetary boundary layer in undisturbed trade winds over the Atlantic Ocean, Bound.-Lay. Meteorol., 6, 129–150, 1974. a
Betts, A. K. and Ridgway, W.: Coupling of the radiative, convective, and surface fluxes over the equatorial Pacific, J. Atmos. Sci., 45, 522–536, 1988. a
Bretherton, C.: A conceptual model of the stratocumulus-trade-cumulus transition in the subtropical oceans, in: Proc. 11th Int. Conf. on Clouds and Precipitation, vol. 1, pp. 374–377, International Commission on Clouds and Precipitation and International Association of Meteorology and Atmospheric Physics Montreal, Quebec, Canada, 1992. a
Bretherton, C. S. and Park, S.: A new moist turbulence parameterization in the Community Atmosphere Model, J. Climate, 22, 3422–3448, 2009. a
Short summary
Clouds exert substantial impacts on the global radiation budget and hydrological cycle. We propose a new proxy for the observed low-level cloud amount (LCA), so-called ELF (estimated low-level cloud fraction), and we show that ELF achieves the unprecedented best performance in diagnosing spatiotemporal variations of the observed LCA. Our study can be used to evaluate the performance of GCMs, identify the source of inaccurate simulation of LCA, and better understand climate sensitivity.
Final-revised paper