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Title: An Idealized Test of the Response of the Community Atmosphere Model to Near‐Grid‐Scale Forcing Across Hydrostatic Resolutions

Abstract

A set of idealized experiments are developed using the Community Atmosphere Model (CAM) to understand the vertical velocity response to reductions in forcing scale that is known to occur when the horizontal resolution of the model is increased. The test consists of a set of rising bubble experiments, in which the horizontal radius of the bubble and the model grid spacing are simultaneously reduced. The test is performed with moisture, through incorporating moist physics routines of varying complexity, although convection schemes are not considered. Results confirm that the vertical velocity in CAM is to first-order, proportional to the inverse of the horizontal forcing scale, which is consistent with a scale analysis of the dry equations of motion. On the other hand, experiments in which the coupling time step between the moist physics routines and the dynamical core (i.e., the ‘‘physics’’ time step) are relaxed back to more conventional values results in severely damped vertical motion at high resolution, degrading the scaling. A set of aqua-planet simulations using different physics time steps are found to be consistent with the results of the idealized experiments.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. School of Marine and Atmospheric SciencesState University of New York at Stony BrookStony Brook NY USA
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1422638
Alternate Identifier(s):
OSTI ID: 1422639; OSTI ID: 1511461
Grant/Contract Number:  
DE‐SC0016605; SC0016605
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: 10 Journal Issue: 2; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; GCMs; horizontal resolution; idealized tests; cloud parameterizations

Citation Formats

Herrington, A. R., and Reed, K. A. An Idealized Test of the Response of the Community Atmosphere Model to Near‐Grid‐Scale Forcing Across Hydrostatic Resolutions. United States: N. p., 2018. Web. doi:10.1002/2017MS001078.
Herrington, A. R., & Reed, K. A. An Idealized Test of the Response of the Community Atmosphere Model to Near‐Grid‐Scale Forcing Across Hydrostatic Resolutions. United States. doi:10.1002/2017MS001078.
Herrington, A. R., and Reed, K. A. Mon . "An Idealized Test of the Response of the Community Atmosphere Model to Near‐Grid‐Scale Forcing Across Hydrostatic Resolutions". United States. doi:10.1002/2017MS001078.
@article{osti_1422638,
title = {An Idealized Test of the Response of the Community Atmosphere Model to Near‐Grid‐Scale Forcing Across Hydrostatic Resolutions},
author = {Herrington, A. R. and Reed, K. A.},
abstractNote = {A set of idealized experiments are developed using the Community Atmosphere Model (CAM) to understand the vertical velocity response to reductions in forcing scale that is known to occur when the horizontal resolution of the model is increased. The test consists of a set of rising bubble experiments, in which the horizontal radius of the bubble and the model grid spacing are simultaneously reduced. The test is performed with moisture, through incorporating moist physics routines of varying complexity, although convection schemes are not considered. Results confirm that the vertical velocity in CAM is to first-order, proportional to the inverse of the horizontal forcing scale, which is consistent with a scale analysis of the dry equations of motion. On the other hand, experiments in which the coupling time step between the moist physics routines and the dynamical core (i.e., the ‘‘physics’’ time step) are relaxed back to more conventional values results in severely damped vertical motion at high resolution, degrading the scaling. A set of aqua-planet simulations using different physics time steps are found to be consistent with the results of the idealized experiments.},
doi = {10.1002/2017MS001078},
journal = {Journal of Advances in Modeling Earth Systems},
number = 2,
volume = 10,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1002/2017MS001078

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