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

AMS Citation:
Lauritzen, P. H., A. A. Mirin, J. E. Truesdale, K. D. Raeder, J. L. Anderson, J. Bacmeister, and R. B. Neale, 2012: Implementation of new diffusion/filtering operators in the CAM-FV dynamical core. International Journal of High Performance Computing Applications, 26, 63-73, doi:10.1177/1094342011410088.
Date:2012-02-01
Resource Type:article
Title:Implementation of new diffusion/filtering operators in the CAM-FV dynamical core
Abstract: Two new filtering/diffusion operators have been implemented in the Community Atmosphere Model finite-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 significantly 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.
Subject(s):Diffusion filtering, CAM-FV, Dynamical core, DART, Laplacian damping
Peer Review:Refereed
Copyright Information:Copyright 2012 Author(s).
OpenSky citable URL: ark:/85065/d7kd2060
Publisher's Version: 10.1177/1094342011410088
Author(s):
  • Peter Lauritzen - NCAR/UCAR
  • Arthur Mirin
  • John Truesdale - NCAR/UCAR
  • Kevin Raeder - NCAR/UCAR
  • Jeffrey Anderson - NCAR/UCAR
  • Julio Bacmeister - NCAR/UCAR
  • Richard Neale - NCAR/UCAR
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