Publication Abstracts

Zhang et al. 2013

Zhang, M., C.S. Bretherton, P.N. Blossey, P.H. Austin, J.T. Bacmeister, S. Bony, F. Brient, S.K. Cheedela, A. Cheng, A.D. Del Genio, S.R. De Roode, S. Endo, C.N. Franklin, J.-C. Golaz, C. Hannay, T. Heus, F.A. Isotta, J.-L. Dufresne, I.-S. Kang, H. awai, M. Köehler, V.E. Larson, Y. Liu, A.P. Lock, U. Lohmann, M.F. Khairoutdinov, A.M. Molod, R.A.J. Neggers, P. Rasch, I. Sandu, R. Senkbeil, A.P. Siebesma, C. Siegenthaler-Le Drian, B. Stevens, M.J. Suarez, K.-M. Xu, K. von Salzen, M.J. Webb, A. Wolf, and M. Zhao, 2013: CGILS: Results from the first phase of an international project to understand the physical mechanisms of low cloud feedbacks in single column models. J. Adv. Model. Earth Syst., 5, 826-842, doi:10.1002/2013MS000246.

CGILS – the CFMIP-GASS Intercomparison of Large Eddy Models (LESs) and single column models (SCMs) – investigates the mechanisms of cloud feedback in SCMs and LESs under idealized climate change perturbation. This paper describes the CGILS results from 15 SCMs and 8 LES models. Three cloud regimes over the subtropical oceans are studied: shallow cumulus, cumulus under stratocumulus, and well-mixed coastal stratus/stratocumulus. In the stratocumulus and coastal stratus regimes, SCMs without activated shallow convection generally simulated negative cloud feedbacks, while models with active shallow convection generally simulated positive cloud feedbacks. In the shallow cumulus alone regime, this relationship is less clear, likely due to the changes in cloud depth, lateral mixing, and precipitation or a combination of them. The majority of LES models simulated negative cloud feedback in the well-mixed coastal stratus/stratocumulus regime, and positive feedback in the shallow cumulus and stratocumulus regime. A general framework is provided to interpret SCM results: in a warmer climate, the moistening rate of the cloudy layer associated with the surface-based turbulence parameterization is enhanced; together with weaker large-scale subsidence, it causes negative cloud feedback. In contrast, in the warmer climate, the drying rate associated with the shallow convection scheme is enhanced. This causes positive cloud feedback. These mechanisms are summarized as the "NESTS" negative cloud feedback and the "SCOPE" positive cloud feedback (Negative feedback from Surface Turbulence under weaker Subsidence-Shallow Convection PositivE feedback) with the net cloud feedback depending on how the two opposing effects counteract each other. The LES results are consistent with these interpretations.

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BibTeX Citation

@article{zh00200t,
  author={Zhang, M. and Bretherton, C. S. and Blossey, P. N. and Austin, P. H. and Bacmeister, J. T. and Bony, S. and Brient, F. and Cheedela, S. K. and Cheng, A. and Del Genio, A. D. and De Roode, S. R. and Endo, S. and Franklin, C. N. and Golaz, J.-C. and Hannay, C. and Heus, T. and Isotta, F. A. and Dufresne, J.-L. and Kang, I.-S. and awai, H. and Köehler, M. and Larson, V. E. and Liu, Y. and Lock, A. P. and Lohmann, U. and Khairoutdinov, M. F. and Molod, A. M. and Neggers, R. A. J. and Rasch, P. and Sandu, I. and Senkbeil, R. and Siebesma, A. P. and Siegenthaler-Le Drian, C. and Stevens, B. and Suarez, M. J. and Xu, K.-M. and von Salzen, K. and Webb, M. J. and Wolf, A. and Zhao, M.},
  title={CGILS: Results from the first phase of an international project to understand the physical mechanisms of low cloud feedbacks in single column models},
  year={2013},
  journal={J. Adv. Model. Earth Syst.},
  volume={5},
  pages={826--842},
  doi={10.1002/2013MS000246},
}

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RIS Citation

TY  - JOUR
ID  - zh00200t
AU  - Zhang, M.
AU  - Bretherton, C. S.
AU  - Blossey, P. N.
AU  - Austin, P. H.
AU  - Bacmeister, J. T.
AU  - Bony, S.
AU  - Brient, F.
AU  - Cheedela, S. K.
AU  - Cheng, A.
AU  - Del Genio, A. D.
AU  - De Roode, S. R.
AU  - Endo, S.
AU  - Franklin, C. N.
AU  - Golaz, J.-C.
AU  - Hannay, C.
AU  - Heus, T.
AU  - Isotta, F. A.
AU  - Dufresne, J.-L.
AU  - Kang, I.-S.
AU  - awai, H.
AU  - Köehler, M.
AU  - Larson, V. E.
AU  - Liu, Y.
AU  - Lock, A. P.
AU  - Lohmann, U.
AU  - Khairoutdinov, M. F.
AU  - Molod, A. M.
AU  - Neggers, R. A. J.
AU  - Rasch, P.
AU  - Sandu, I.
AU  - Senkbeil, R.
AU  - Siebesma, A. P.
AU  - Siegenthaler-Le Drian, C.
AU  - Stevens, B.
AU  - Suarez, M. J.
AU  - Xu, K.-M.
AU  - von Salzen, K.
AU  - Webb, M. J.
AU  - Wolf, A.
AU  - Zhao, M.
PY  - 2013
TI  - CGILS: Results from the first phase of an international project to understand the physical mechanisms of low cloud feedbacks in single column models
JA  - J. Adv. Model. Earth Syst.
VL  - 5
SP  - 826
EP  - 842
DO  - 10.1002/2013MS000246
ER  -

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