Implementation of new diffusion/filtering operators in the CAM-FV dynamical core

نویسندگان

  • Peter H. Lauritzen
  • Arthur A. Mirin
  • John Truesdale
  • Kevin Raeder
  • Jeffrey L. Anderson
  • Julio Bacmeister
  • Richard B. Neale
چکیده

Two new ltering/diffusion operators have been implemented in the Community Atmosphere Model nite-volume dynamical core (CAM-FV). First, a fourth-order divergence damping operator has been added to optionally replace the second-order version that has traditionally been used. This provides more scale selective dissipation of divergent modes that can generate gridscale noise in CAM-FV if not damped properly. For example, data-assimilation runs using CAMFV DART (Data Assimilation Research Testbed) have revealed potential noise problems at the grid scale that can be alleviated signicantly using higher-order divergence damping. Second, a ‘‘Laplacian’’-type damping operator has been implemented to increase the explicit momentum dissipation in the top-of-atmosphere sponge layers. This helps control the excessive polar night jets that have been observed in ultra-high resolution CAM-FV simulations. Results from stand-alone CAM-FV and CAM-FV DART are presented in this paper along with details on the implementation of the new operators.

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عنوان ژورنال:
  • IJHPCA

دوره 26  شماره 

صفحات  -

تاریخ انتشار 2012