AGRIF: Adaptive grid refinement in Fortran

Debreu, Laurent; Vouland, Christophe; Blayo, Éric

doi:10.1016/j.cageo.2007.01.009

Cited by 187 publications

(142 citation statements)

References 5 publications

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“…As a base, TROPAC01 has a global 1/28 horizontal grid (ORCA05) and shares the vertical levels with ORCA025. Between 498S and 318N in the Pacific, a grid with 1/108 resolution is nested into the ORCA05 grid using adaptive grid refinement in Fortran (AGRIF; Debreu et al 2008). TROPAC01 has been compared to observations in Czeschel et al (2011) andvan Sebille et al (2014).…”

Section: Model Methods and Datamentioning

confidence: 99%

Decadal Variability of Eddy Kinetic Energy in the South Pacific Subtropical Countercurrent in an Ocean General Circulation Model

Rieck

Böning

Greatbatch

2018

Journal of Physical Oceanography

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The eddy kinetic energy (EKE) associated with the Subtropical Countercurrent (STCC) in the western subtropical South Pacific is known to exhibit substantial seasonal and decadal variability. Using an eddypermitting ocean general circulation model, which is able to reproduce the observed, salient features of the seasonal cycles of shear, stratification, baroclinic production, and the associated EKE, the authors investigate the decadal changes of EKE. The authors show that the STCC region exhibits, uniquely among the subtropical gyres of the world's oceans, significant, atmospherically forced, decadal EKE variability. The decadal variations are driven by changing vertical shear between the STCC in the upper 300 m and the South Equatorial Current below, predominantly caused by variations in STCC strength associated with a changing meridional density gradient. In the 1970s, an increased meridional density gradient results in EKE twice as large as in later decades in the model. Utilizing sensitivity experiments, decadal variations in the wind field are shown to be the essential driver. Local wind stress curl anomalies associated with the interdecadal Pacific oscillation (IPO) lead to upwelling and downwelling of the thermocline, inducing strengthening or weakening of the STCC and the associated EKE. Additionally, remote wind stress curl anomalies in the eastern subtropical South Pacific, which are not related to the IPO, generate density anomalies that propagate westward as Rossby waves and can account for up to 30%-40% of the density anomalies in the investigated region.

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Section: Model Methods and Datamentioning

confidence: 99%

Decadal Variability of Eddy Kinetic Energy in the South Pacific Subtropical Countercurrent in an Ocean General Circulation Model

Rieck

Böning

Greatbatch

2018

Journal of Physical Oceanography

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“…Especially in the subpolar North Atlantic it has been demonstrated that this leads to an improved boundary current circulation (Käse et al, 2001). A regional grid refinement (AGRIF, Debreu et al, 2008) over the northern North Atlantic (from ~ 30°N-85°N) is embedded in the global configuration via a -two-way nesting‖ approach. The horizontal resolution in this high-resolution domain is nominal 0.05° (corresponding to horizontal grid scales between ~5 km and ~1 km).…”

Section: ) Viking20 -High-resolution Modeling Of the Subpolar Northmentioning

confidence: 99%

Intra-seasonal variability of the DWBC in the western subpolar North Atlantic

Fischer

Karstensen

Zantopp

et al. 2015

Progress in Oceanography

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The Deep Western Boundary Current (DWBC) along the western margin of the subpolar North Atlantic is an important component of the deep limb of the Meridional Overturning near its northern origins. A network of moored arrays from Denmark Strait to the tail of the Grand Banks has been installed for almost two decades to observe the boundary currents and transports of North Atlantic Deep Water as part of an internationally coordinated Observatory for the Atlantic Meridional Overturning Circulation. The dominant variability in all of the moored velocity time series is in the week-to-month period range. While the temporal characteristics of this variability changes only gradually between Denmark Strait and Flemish Cap, a broad band of longer term variability is present farther along the path of the DWBC at the Grand Banks and in the interior basins (Labrador and Irminger Seas). The vigorous intraseasonal variability may well mask possible interannual to decadal variability that is typically an order of magnitude smaller than the high-frequency fluctuations. Here, the intra-seasonal variability at key positions along the DWBC path using both, observations and high resolution model data is quantified. The results are used to evaluate the model circulation, and in turn the model is used to relate the discrete measurements to the overall pattern of the subpolar circulation. Topographic waves are found to be trapped by the steep topography all around the western basins, the Labrador and Irminger Seas. In the Labrador Sea, the high intra-seasonal variability of the boundary current regime is separated by a region of extremely low variability in narrow recirculation cells from the basin interior. There, the variability is also on intra-seasonal timescales, but at much longer periods around 50 days. We would like to thank reviewer #2 for his/her very careful evaluation of our manuscript, the constructive criticism and the recommendations for corrections and suggestions. Below, recommendations by the reviewer are in blue and our response in black.Review of "Intra-seasonal variability of the Deep Western Boundary Current in the western subpolar North Atlantic", Manuscript Number: PROOCE-D-13-00096 1 General comments: Using long current meter records in the western margin of the subpolar gyre, the authors investigate the intra-seasonal variability in the Deep Western Boundary Current. From the Denmark Strait to the Grand Banks they show -that the dominant variability is in the week-to-month period range -that 10 day periods dominate the variance, which they attribute to topographic Rossby waves -that at Flemish Cap and farther south, there is also variability at longer periods -that in the basin centers (Labrador and Irminger) the variance dominate at 50 day period and there is almost no variance at 10 days. Using a long time series in the DWBC at 53°N they also find seasonality in the intra-seasonal variability, with an offset of 6 months between the surface and the bottom. Then to validate a new high resolu...

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“…The AGRIF package 24,25 is implemented in the NEMO system. It has been shown by Cailleau et al 9 that the twoway AGRIF nesting methods result in far more satisfactory behaviour than clamped and radiation boundary conditions which systematically lead to energy accumulation and problematic re-circulations along the open boundaries, disturbing the internal dynamics of the regional domain.…”

Section: Agrif Nest: Two-way Connection and Refinement (Swp To And Frmentioning

confidence: 99%

A 1/36° model of the Solomon Sea embedded into a global ocean model: On the setting up of an interactive open boundary nested model system

Djath¹,

Melet²,

Verron³

et al. 2014

Journal of Operational Oceanography

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AGRIF: Adaptive grid refinement in Fortran

Cited by 187 publications

References 5 publications

Decadal Variability of Eddy Kinetic Energy in the South Pacific Subtropical Countercurrent in an Ocean General Circulation Model

Decadal Variability of Eddy Kinetic Energy in the South Pacific Subtropical Countercurrent in an Ocean General Circulation Model

Intra-seasonal variability of the DWBC in the western subpolar North Atlantic

A 1/36° model of the Solomon Sea embedded into a global ocean model: On the setting up of an interactive open boundary nested model system

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