Exploring a Lower‐Resolution Physics Grid in CAM‐SE‐CSLAM
Abstract
This paper describes the implementation of a coarser-resolution physics grid into the Community Atmosphere Model (CAM), containing $$5\over{9}$$ fewer grid columns than the dynamics grid. The dry dynamics is represented by the spectral element dynamical core, and tracer transport is computed using the Conservative Semi-Lagrangian Finite Volume Method (CAM-SE-CSLAM). Algorithms are presented that map fields between the dynamics and physics grids while maintaining numerical properties ideal for atmospheric simulations such as mass conservation and mixing ratio shape and linear-correlation preservation. The results of experiments using the lower-resolution physics grid are compared to the conventional method in which the physics and dynamical grids coincide. The lower-resolution physics grid provides a volume mean state to the physics computed from an equal sampling of the different types of nodal solutions arising in the spectral-element method and effectively mitigates grid imprinting in regions with steep topography. The impact of the coarser-resolution physics grid on the resolved scales of motion is analyzed in an aqua planet configuration, across a range of dynamical core grid resolutions. The results suggest that the effective resolution of the model is not degraded through the use of a coarser-resolution physics grid. Since the physics makes up about half the computational cost of the conventional CAM-SE-CSLAM configuration, the coarser physics grid may allow for significant cost savings with little to no downside
- Authors:
-
- School of Marine and Atmospheric SciencesStony Brook University Stony Brook NY USA
- National Center for Atmospheric Research Boulder CO USA
- Publication Date:
- Research Org.:
- Univ. of Georgia, Athens, GA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1560186
- Alternate Identifier(s):
- OSTI ID: 1560188; OSTI ID: 1613245
- Grant/Contract Number:
- SC0019459; 12-015334
- Resource Type:
- Published Article
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 11 Journal Issue: 7; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences
Citation Formats
Herrington, Adam R., Lauritzen, Peter H., Reed, Kevin A., Goldhaber, Steve, and Eaton, Brian E. Exploring a Lower‐Resolution Physics Grid in CAM‐SE‐CSLAM. United States: N. p., 2019.
Web. doi:10.1029/2019MS001684.
Herrington, Adam R., Lauritzen, Peter H., Reed, Kevin A., Goldhaber, Steve, & Eaton, Brian E. Exploring a Lower‐Resolution Physics Grid in CAM‐SE‐CSLAM. United States. https://doi.org/10.1029/2019MS001684
Herrington, Adam R., Lauritzen, Peter H., Reed, Kevin A., Goldhaber, Steve, and Eaton, Brian E. Wed .
"Exploring a Lower‐Resolution Physics Grid in CAM‐SE‐CSLAM". United States. https://doi.org/10.1029/2019MS001684.
@article{osti_1560186,
title = {Exploring a Lower‐Resolution Physics Grid in CAM‐SE‐CSLAM},
author = {Herrington, Adam R. and Lauritzen, Peter H. and Reed, Kevin A. and Goldhaber, Steve and Eaton, Brian E.},
abstractNote = {This paper describes the implementation of a coarser-resolution physics grid into the Community Atmosphere Model (CAM), containing $5\over{9}$ fewer grid columns than the dynamics grid. The dry dynamics is represented by the spectral element dynamical core, and tracer transport is computed using the Conservative Semi-Lagrangian Finite Volume Method (CAM-SE-CSLAM). Algorithms are presented that map fields between the dynamics and physics grids while maintaining numerical properties ideal for atmospheric simulations such as mass conservation and mixing ratio shape and linear-correlation preservation. The results of experiments using the lower-resolution physics grid are compared to the conventional method in which the physics and dynamical grids coincide. The lower-resolution physics grid provides a volume mean state to the physics computed from an equal sampling of the different types of nodal solutions arising in the spectral-element method and effectively mitigates grid imprinting in regions with steep topography. The impact of the coarser-resolution physics grid on the resolved scales of motion is analyzed in an aqua planet configuration, across a range of dynamical core grid resolutions. The results suggest that the effective resolution of the model is not degraded through the use of a coarser-resolution physics grid. Since the physics makes up about half the computational cost of the conventional CAM-SE-CSLAM configuration, the coarser physics grid may allow for significant cost savings with little to no downside},
doi = {10.1029/2019MS001684},
journal = {Journal of Advances in Modeling Earth Systems},
number = 7,
volume = 11,
place = {United States},
year = {Wed Jul 10 00:00:00 EDT 2019},
month = {Wed Jul 10 00:00:00 EDT 2019}
}
https://doi.org/10.1029/2019MS001684
Web of Science
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