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Unified Parameterization of the Planetary Boundary Layer and Shallow Convection with a Higher-order Turbulence Closure in the Community Atmosphere Model: Single Column Experiments : Volume 5, Issue 3 (06/07/2012)

By Bogenschutz, P. A.


Description
Description: National Center for Atmospheric Research, Boulder, Colorado, USA. This paper describes the coupling of the Community Atmosphere Model (CAM) version 5 with a unified multi-variate probability density function (PDF) parameterization, Cloud Layers Unified by Binormals (CLUBB). CLUBB replaces the planetary boundary layer (PBL), shallow convection, and cloud macrophysics schemes in CAM5 with a higher-order turbulence closure based on an assumed PDF. Comparisons of single-column versions of CAM5 and CAM-CLUBB are provided in this paper for several boundary layer regimes. As compared to Large Eddy Simulations (LES), CAM-CLUBB and CAM5 simulate marine stratocumulus regimes with similar accuracy. For shallow convective regimes, CAM-CLUBB improves the representation of cloud cover and liquid water path (LWP). In addition, for shallow convection CAM-CLUBB offers better fidelity for sub-grid scale vertical velocity, which is an important input for aerosol activation. Finally, CAM-CLUBB results are more robust to changes in vertical and temporal resolution when compared to CAM5.

Summary
Unified parameterization of the planetary boundary layer and shallow convection with a higher-order turbulence closure in the community atmosphere model: single column experiments

Excerpt
Randall, D. A., Xu, K. M., Somerville, R. J. C., and Iacobellis, S.: Single-column models and cloud ensemble models as links between observations and climate models, J. Climate, 9, 1683–1697, 1996.; Schubert, W. H., Wakefield, J. S., Steiner, E. J., and Cox, S. K.: Marine stratocumulus convection, part I: governing equations and horizontally homogeneous solutions, J. Atmos. Sci., 36, 1286–1307, 1979.; Siebesma, A. P., Bretherton, C. S., Brown, A., Chlond, A., Cuxart, J., Duynkerke, P. G., Jiang, H., Khairoutdinov, M., Lewellen, D., Moeng, C.-H., Sanchez, E., Stevens, B., and Stevens, D. E.: A large eddy simulation intercomparison study of shallow cumulus convection, J. Atmos. Sci., 60, 1201–1219, 2.0>doi:10.1175/1520-0469(2003)60<1201-ALESIS>2.0, 2003.; Stephens, G. L.: Cloud feedbacks in the climate system: a critical review, J. Climate, 18, 237–273, 2005.; Stevens, B., Ackerman, A. S., Albrecht, B. A., Brown, A. R., Chlond, A., Cuxart, J., Duynkerke, P. G., Lewellen, D. C., Macvean, M. K., Neggers, R. A. J., Sanchez, E., Siebesma, A. P., and Stevens, D. E.: Simulations of trade-wind cumuli under a strong inversion, J. Atmos. Sci., 58, 1870–1891, 2001.; Stevens, B., Moeng, C.-H., Ackerman, A. S., Bretherton, C. S., Chlond, A., De Roode, S., Edwards, J., Golaz, J.-C., Jiang, H., Khairoutdinov, M., Kirkpatrick, M. P., Lewellen, D. C., Lock, A., Muller, F., Stevens, D. E., Whelan, E., and Zhu, P. : Evaluation of large-eddy simulations via observations of nocturnal marine stratocumulus, Mon. Weather Rev., 133, 1443–1462, 2005.; Ackerman, A. S., VanZanten, M. C., Stevens, B., Savic-Jovcic, V., Bretherton, C. S., Chlond, A., Golaz, J.-C., Jiang, H., Khairoutdinov, M., Krueger, S. K., Lewellen, D. C., Lock, A., Moeng, C.-H., Nakamura, K., Petters, M. D., Snider, J. R., Weinbrecht, S., and Zulauf, M.: Large-eddy simulations of a drizzling, stratocumulus-topped marine boundary layer, Mon. Weather Rev., 137, 1083–1110, 2009.; Bogenschutz, P. and Krueger, S. K.: Improved boundary layer cloud simulations in cloud resolving models with a simple turbulence closure, in preparation, 2012.; Bogenschutz, P., Krueger, S. K., and Khairoutdinov, M.: Assumed probability density functions fo shallow and deep convection, J. Adv. Model. Earth Syst., 2, 10, doi:10.3894/JAMES.2010.2.10, 2010.; Bony, S. and Dufresne, J.-L.: Marine boundary layer clouds at the heart of tropical cloud feedback uncertainties in climate model, Geophys. Res. Lett., 32, L20806, doi:10.1029/2005GL023851, 2005.; von Salzen, K. and McFarlane, N. A.: Parameterization of the bulk effects of lateral and cloud-top entrainment in transient shallow cumulus clouds, J. Atmos. Sci., 59, 1405–1430, 2002.; Webb, M. J., Senior, C. A., Sexton, M. H., Ingram, W. J., Williams, K. D., Ringer, M. A., McAvaney, B. J., Colman, R., Soden, B. J., Gudgel, R., Knutson, T., Emori, S., Ogura, T., Tsushima, Y., Andronova, N., Li, B., Musat, I., Bony, S., and Taylor, K. E.: On the contribution of local feedback mechanisms to the range of climate sensitivity in two GCM ensembles, Clim. Dynam., 27, 17–38, 2006.; Zhang, G. J. and McFarlane, N. A.: Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadia

 

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