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Title: A study of overflow simulations using MPAS-Ocean: Vertical grids, resolution, and viscosity

Authors:
ORCiD logo; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1263702
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Ocean Modelling
Additional Journal Information:
Journal Volume: 96; Journal Issue: P2; Related Information: CHORUS Timestamp: 2017-10-03 22:28:09; Journal ID: ISSN 1463-5003
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Reckinger, Shanon M., Petersen, Mark R., and Reckinger, Scott J. A study of overflow simulations using MPAS-Ocean: Vertical grids, resolution, and viscosity. United Kingdom: N. p., 2015. Web. doi:10.1016/j.ocemod.2015.09.006.
Reckinger, Shanon M., Petersen, Mark R., & Reckinger, Scott J. A study of overflow simulations using MPAS-Ocean: Vertical grids, resolution, and viscosity. United Kingdom. doi:10.1016/j.ocemod.2015.09.006.
Reckinger, Shanon M., Petersen, Mark R., and Reckinger, Scott J. Tue . "A study of overflow simulations using MPAS-Ocean: Vertical grids, resolution, and viscosity". United Kingdom. doi:10.1016/j.ocemod.2015.09.006.
@article{osti_1263702,
title = {A study of overflow simulations using MPAS-Ocean: Vertical grids, resolution, and viscosity},
author = {Reckinger, Shanon M. and Petersen, Mark R. and Reckinger, Scott J.},
abstractNote = {},
doi = {10.1016/j.ocemod.2015.09.006},
journal = {Ocean Modelling},
number = P2,
volume = 96,
place = {United Kingdom},
year = {Tue Dec 01 00:00:00 EST 2015},
month = {Tue Dec 01 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.ocemod.2015.09.006

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  • Cited by 17
  • Impacts of regional grid refinement on large-scale circulations (“upscale effects”) were detected in a previous study that used the Model for Prediction Across Scales-Atmosphere coupled to the physics parameterizations of the Community Atmosphere Model version 4. The strongest upscale effect was identified in the Southern Hemisphere jet during austral winter. This study examines the detailed underlying processes by comparing two simulations at quasi-uniform resolutions of 30 and 120 km to three variable-resolution simulations in which the horizontal grids are regionally refined to 30 km in North America, South America, or Asia from 120 km elsewhere. In all the variable-resolution simulations,more » precipitation increases in convective areas inside the high-resolution domains, as in the reference quasi-uniform high-resolution simulation. With grid refinement encompassing the tropical Americas, the increased condensational heating expands the local divergent circulations (Hadley cell) meridionally such that their descending branch is shifted poleward, which also pushes the baroclinically unstable regions, momentum flux convergence, and the eddy-driven jet poleward. This teleconnection pathway is not found in the reference high-resolution simulation due to a strong resolution sensitivity of cloud radiative forcing that dominates the aforementioned teleconnection signals. The regional refinement over Asia enhances Rossby wave sources and strengthens the upper level southerly flow, both facilitating the cross-equatorial propagation of stationary waves. Evidence indicates that this teleconnection pathway is also found in the reference high-resolution simulation. Lastly, the result underlines the intricate diagnoses needed to understand the upscale effects in global variable-resolution simulations, with implications for science investigations using the computationally efficient modeling framework.« less
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    Cited by 3
  • Climate models with variable-resolution grids offer a computationally less expensive way to provide more detailed information at regional scales and increased accuracy for processes that cannot be resolved by a coarser grid. This study uses the Model for Prediction Across Scales–Atmosphere (MPAS22A), consisting of a nonhydrostatic dynamical core and a subset of Advanced Research Weather Research and Forecasting (ARW-WRF) model atmospheric physics that have been modified to include the Community Atmosphere Model version 5 (CAM5) cloud fraction parameterization, to investigate the potential benefits of using increased resolution in an tropical channel. The simulations are performed with an idealized aquaplanet configurationmore » using two quasi-uniform grids, with 30 km and 240 km grid spacing, and two variable-resolution grids spanning the same grid spacing range; one with a narrow (20°S–20°N) and one with a wide (30°S–30°N) tropical channel refinement. Results show that increasing resolution in the tropics impacts both the tropical and extratropical circulation. Compared to the quasi-uniform coarse grid, the narrow-channel simulation exhibits stronger updrafts in the Ferrel cell as well as in the middle of the upward branch of the Hadley cell. The wider tropical channel has a closer correspondence to the 30 km quasi-uniform simulation. However, the total atmospheric poleward energy transports are similar in all simulations. The largest differences are in the low-level cloudiness. The refined channel simulations show improved tropical and extratropical precipitation relative to the global 240 km simulation when compared to the global 30 km simulation. All simulations have a single ITCZ. Furthermore, the relatively small differences in mean global and tropical precipitation rates among the simulations are a promising result, and the evidence points to the tropical channel being an effective method for avoiding the extraneous numerical artifacts seen in earlier studies that only refined portion of the tropics.« less
  • Abstract not provided.