A prototype two-decade fully-coupled fine-resolution CCSM simulation

McClean, Julie L.; Bader, David C.; Bryan, Frank O.; Maltrud, Mathew; Dennis, John M.; Mirin, A.A.; Jones, Philip W.; Kim, Yoo Yin; Ivanova, D.; Vertenstein, Mariana; Boyle, James S.; Jacob, Robert; Norton, Nancy J.; Craig, Anthony P; Worley, Patrick H

doi:10.1016/j.ocemod.2011.02.011

Cited by 131 publications

(153 citation statements)

References 85 publications

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“…The second simulation is carried out in two phases with the same atmospheric model coupled to 0.1º ocean and sea-ice component models. The ocean model configuration in this case is identical to that used in a century-long ocean simulation (Maltrud et al 2010) and in the coupled climate simulation of McClean et al (2011). In addition to the change in horizontal resolution from the control experiment, there are commensurate changes in the parameterization of horizontal sub-grid scale dissipation, and a different, 42 level vertical grid.…”

Section: B Increasing the Ocean Model Resolutionmentioning

confidence: 99%

“…The atmospheric component model resolution is identical (i.e., 0.5º) in all the experiments presented here. McClean et al (2010) and Bryan et al (2010) were the first to examine the question of resolution dependence of simulations with CCSM that incorporated an eddy resolving ocean component 2 . In particular, McClean et al (2010) used the same version of the CCSM component models as used in this study and G09 but with approximately a 0.25º horizontal atmospheric model resolution coupled to the 0.1º ocean component.…”

Section: Introductionmentioning

confidence: 99%

“…McClean et al (2010) and Bryan et al (2010) were the first to examine the question of resolution dependence of simulations with CCSM that incorporated an eddy resolving ocean component 2 . In particular, McClean et al (2010) used the same version of the CCSM component models as used in this study and G09 but with approximately a 0.25º horizontal atmospheric model resolution coupled to the 0.1º ocean component. The coupled model was run for 20 years, and produced simulated SST that is too cold in the sub-polar and mid-latitude Northern Hemisphere, but more realistic Aghulas eddy pathways compared to ocean-only simulations at comparable resolution.…”

Section: Introductionmentioning

confidence: 99%

“…The coupled model was run for 20 years, and produced simulated SST that is too cold in the sub-polar and mid-latitude Northern Hemisphere, but more realistic Aghulas eddy pathways compared to ocean-only simulations at comparable resolution. Bryan et al (2010) examined the McClean et al (2010) simulation as well as two additional experiments separately probing the ocean and atmospheric model resolution. As in McClean et al (2010), the Bryan et al (2010) simulations were run for approximately 20 years.…”

Section: Introductionmentioning

confidence: 99%

“…Bryan et al (2010) examined the McClean et al (2010) simulation as well as two additional experiments separately probing the ocean and atmospheric model resolution. As in McClean et al (2010), the Bryan et al (2010) simulations were run for approximately 20 years. Bryan et al (2010) focused primarily on the coupling between the lower atmosphere and the SST, and found a more realistic pattern of positive correlation between high-pass filtered surface wind speed and SST when the ocean component model is eddy resolving.…”

Section: Introductionmentioning

confidence: 99%

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Impact of ocean model resolution on CCSM climate simulations

et al. 2012

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The current literature provides compelling evidence suggesting that an eddy-resolving (as opposed to eddy-permitting or eddy-parameterized) ocean component model will significantly impact the simulation of the large-scale climate, although this has not been fully tested to date in multi-decadal global coupled climate simulations. The purpose of this paper is to document how increased ocean model resolution impacts the simulation of large-scale climate variability. The model used for this study is the NCAR Community Climate System Model version 3.5 (CCSM3.5) -the forerunner to CCSM4. Two experiments are reported here. The first experiment (i.e., control) is a 155-year present-day climate simulation using a 0.5º atmosphere component (zonal resolution 0.625º meridional resolution 0.5º) coupled to ocean and sea-ice components with zonal resolution of 1.2º and meridional resolution varying from 0.27º at the equator to 0.54º in the mid-latitudes. The second simulation uses the same atmospheric model coupled to 0.1º ocean and sea-ice component models. The simulations are compared in terms of how the representation of smaller scale features in the time mean ocean circulation and ocean eddies impact the mean and variable climate. In terms of the global mean surface temperature, the enhanced ocean resolution leads to a ubiquitous surface warming of about 0.2 o C. The warming is largest in the Arctic and regions of strong ocean fronts and ocean eddy activity (i.e., Southern Ocean, western boundary currents). The Arctic warming is associated with significant losses of sea-ice in the high-resolution simulation. The SST gradients in the North Atlantic, in particular, are better resolved in the high-resolution model leading to significantly sharper temperature gradients and associated large-scale shifts in the rainfall. In the extra-tropics, the interannual sea surface temperature anomaly (SSTA) variability is increased with the resolved eddies, but decreases in the deep tropics (i.e., the variance of El Niño and the Southern Oscillation is reduced). Changes in global SSTA teleconnections and local air-sea feedback are also documented and show large changes in ocean-atmosphere coupling.3

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Section: B Increasing the Ocean Model Resolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of ocean model resolution on CCSM climate simulations

et al. 2012

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Satellite observations of chlorophyll, phytoplankton biomass, and Ekman pumping in nonlinear mesoscale eddies

et al. 2013

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[1] Nonlinear mesoscale eddies can influence biogeochemical cycles in the upper ocean through vertical and horizontal advection of nutrients and marine organisms. The relative importance of these two processes depends on the polarity of an eddy (cyclones versus anticyclones) and the initial biological conditions of the fluid trapped in the core of the eddy at the time of formation. Eddies originating in the eastern South Indian Ocean are unique in that anticyclones, typically associated with downwelling, contain elevated levels of chlorophyll-a, enhanced primary production and phytoplankton communities generally associated with nutrient-replete environments. From analysis of 9 years of concurrent satellite measurements of sea surface height, chlorophyll, phytoplankton carbon, and surface stress, we present observations that suggest eddy-induced Ekman upwelling as a mechanism that is at least partly responsible for sustaining positive phytoplankton anomalies in anticyclones of the South Indian Ocean. The biological response to this eddyinduced Ekman upwelling is evident only during the Austral winter. During the Austral summer, the biological response to eddy-induced Ekman pumping occurs deep in the euphotic zone, beyond the reach of satellite observations of ocean color.

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The effect of horizontal resolution on simulation quality in the Community Atmospheric Model, CAM5.1

Wehner

Reed

et al. 2014

J Adv Model Earth Syst

262

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We present an analysis of version 5.1 of the Community Atmospheric Model (CAM5.1) at a high horizontal resolution. Intercomparison of this global model at approximately 0.25 , 1 , and 2 is presented for extreme daily precipitation as well as for a suite of seasonal mean fields. In general, extreme precipitation amounts are larger in high resolution than in lower-resolution configurations. In many but not all locations and/or seasons, extreme daily precipitation rates in the high-resolution configuration are higher and more realistic. The high-resolution configuration produces tropical cyclones up to category 5 on the SaffirSimpson scale and a comparison to observations reveals both realistic and unrealistic model behavior. In the absence of extensive model tuning at high resolution, simulation of many of the mean fields analyzed in this study is degraded compared to the tuned lower-resolution public released version of the model.

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A prototype two-decade fully-coupled fine-resolution CCSM simulation

Cited by 131 publications

References 85 publications

Impact of ocean model resolution on CCSM climate simulations

Impact of ocean model resolution on CCSM climate simulations

Satellite observations of chlorophyll, phytoplankton biomass, and Ekman pumping in nonlinear mesoscale eddies

The effect of horizontal resolution on simulation quality in the Community Atmospheric Model, CAM5.1

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