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A revised scheme for the WRF surface layer formulation

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Jiménez, Pedro A. and Dudhia, Jimy and González Rouco, J. Fidel and Navarro, Jorge and Montávez, Juan P. and García Bustamante, Elena (2012) A revised scheme for the WRF surface layer formulation. Monthly Weather Review, 140 (3). pp. 898-918. ISSN 0027-0644

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Official URL: http://dx.doi.org/10.1175/MWR-D-11-00056.1


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Abstract

This study summarizes the revision performed on the surface layer formulation of the Weather Research and Forecasting (WRF) model. A first set of modifications are introduced to provide more suitable similarity functions to simulate the surface layer evolution under strong stable/unstable conditions. A second set of changes are incorporated to reduce or suppress the limits that are imposed on certain variables in order to avoid undesired effects (e. g., a lower limit in u_*). The changes introduced lead to a more consistent surface layer formulation that covers the full range of atmospheric stabilities. The turbulent fluxes are more (less) efficient during the day (night) in the revised scheme and produce a sharper afternoon transition that shows the largest impacts in the planetary boundary layer meteorological variables. The most important impacts in the near-surface diagnostic variables are analyzed and compared with observations from a mesoscale network.


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© 2012 American Meteorological Society. This investigation was partially supported by Projects CGL-2008-05093/CLI and CGL-2011-29677-C02 and was accomplished within the Collaboration Agreement 09/490 between CIEMAT and NCAR as well as the Collaboration Agreement 09/153 between CIEMAT and UCM. NCAR is sponsored by the National Science Foundation. We thank the Navarra government for providing us with the observations used in this study. Discussion with Fei Chen and Peggy Lemone were helpful during this work. The authors would also like to thank Maria Tombrou for her comments regarding the similarity functions in unstable conditions. We would also like to thank the reviewers for their constructive comments.

Uncontrolled Keywords:Atmospheric boundary-layer; Flux-profile relationships; Air-sea fluxes; Bulk parameterization; Wind regionalization; Complex terrain; Model; Temperature; Land; Sensitivity
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:36124
Deposited On:04 Mar 2016 13:39
Last Modified:04 Mar 2016 13:39

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