DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: CAM-SE–CSLAM: Consistent Coupling of a Conservative Semi-Lagrangian Finite-Volume Method with Spectral Element Dynamics

Abstract

An algorithm to consistently couple a conservative semi-Lagrangian finite-volume transport scheme with a spectral element (SE) dynamical core is presented. The semi-Lagrangian finite-volume scheme is the Conservative Semi-Lagrangian Multitracer (CSLAM), and the SE dynamical core is the National Center for Atmospheric Research (NCAR)’s Community Atmosphere Model–Spectral Elements (CAM-SE). The primary motivation for coupling CSLAM with CAM-SE is to accelerate tracer transport for multitracer applications. The coupling algorithm result is an inherently mass-conservative, shape-preserving, and consistent (for a constant mixing ratio, the CSLAM solution reduces to the SE solution for air mass) transport that is efficient and accurate. This is achieved by first deriving formulas for diagnosing SE airmass flux through the CSLAM control volume faces. Thereafter, the upstream Lagrangian CSLAM areas are iteratively perturbed to match the diagnosed SE airmass flux, resulting in an equivalent upstream Lagrangian grid that spans the sphere without gaps or overlaps (without using an expensive search algorithm). This new CSLAM algorithm is not specific to airmass fluxes provided by CAM-SE but applies to any airmass fluxes that satisfy the Lipshitz criterion and for which the Courant number is less than one.

Authors:
 [1];  [2];  [2];  [3];  [1];  [1];  [1]
  1. National Center for Atmospheric Research, Boulder, Colorado
  2. Sandia National Laboratories, Albuquerque, New Mexico
  3. Department of Land, Air, and Water Resources, University of California, Davis, Davis, California
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1344324
Grant/Contract Number:  
12-015334
Resource Type:
Published Article
Journal Name:
Monthly Weather Review
Additional Journal Information:
Journal Name: Monthly Weather Review Journal Volume: 145 Journal Issue: 3; Journal ID: ISSN 0027-0644
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English

Citation Formats

Lauritzen, Peter Hjort, Taylor, Mark A., Overfelt, James, Ullrich, Paul A., Nair, Ramachandran D., Goldhaber, Steve, and Kelly, Rory. CAM-SE–CSLAM: Consistent Coupling of a Conservative Semi-Lagrangian Finite-Volume Method with Spectral Element Dynamics. United States: N. p., 2017. Web. doi:10.1175/MWR-D-16-0258.1.
Lauritzen, Peter Hjort, Taylor, Mark A., Overfelt, James, Ullrich, Paul A., Nair, Ramachandran D., Goldhaber, Steve, & Kelly, Rory. CAM-SE–CSLAM: Consistent Coupling of a Conservative Semi-Lagrangian Finite-Volume Method with Spectral Element Dynamics. United States. https://doi.org/10.1175/MWR-D-16-0258.1
Lauritzen, Peter Hjort, Taylor, Mark A., Overfelt, James, Ullrich, Paul A., Nair, Ramachandran D., Goldhaber, Steve, and Kelly, Rory. Wed . "CAM-SE–CSLAM: Consistent Coupling of a Conservative Semi-Lagrangian Finite-Volume Method with Spectral Element Dynamics". United States. https://doi.org/10.1175/MWR-D-16-0258.1.
@article{osti_1344324,
title = {CAM-SE–CSLAM: Consistent Coupling of a Conservative Semi-Lagrangian Finite-Volume Method with Spectral Element Dynamics},
author = {Lauritzen, Peter Hjort and Taylor, Mark A. and Overfelt, James and Ullrich, Paul A. and Nair, Ramachandran D. and Goldhaber, Steve and Kelly, Rory},
abstractNote = {An algorithm to consistently couple a conservative semi-Lagrangian finite-volume transport scheme with a spectral element (SE) dynamical core is presented. The semi-Lagrangian finite-volume scheme is the Conservative Semi-Lagrangian Multitracer (CSLAM), and the SE dynamical core is the National Center for Atmospheric Research (NCAR)’s Community Atmosphere Model–Spectral Elements (CAM-SE). The primary motivation for coupling CSLAM with CAM-SE is to accelerate tracer transport for multitracer applications. The coupling algorithm result is an inherently mass-conservative, shape-preserving, and consistent (for a constant mixing ratio, the CSLAM solution reduces to the SE solution for air mass) transport that is efficient and accurate. This is achieved by first deriving formulas for diagnosing SE airmass flux through the CSLAM control volume faces. Thereafter, the upstream Lagrangian CSLAM areas are iteratively perturbed to match the diagnosed SE airmass flux, resulting in an equivalent upstream Lagrangian grid that spans the sphere without gaps or overlaps (without using an expensive search algorithm). This new CSLAM algorithm is not specific to airmass fluxes provided by CAM-SE but applies to any airmass fluxes that satisfy the Lipshitz criterion and for which the Courant number is less than one.},
doi = {10.1175/MWR-D-16-0258.1},
journal = {Monthly Weather Review},
number = 3,
volume = 145,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1175/MWR-D-16-0258.1

Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

Save / Share: