Data

Circum-Antarctic shoreward heat fluxes derived from eddy- and tide-resolving simulation

Australian Ocean Data Network
Stewart, Andrew ; Klocker, Andreas
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4226/77/5a37035ea15b2&rft.title=Circum-Antarctic shoreward heat fluxes derived from eddy- and tide-resolving simulation&rft.identifier=10.4226/77/5a37035ea15b2&rft.description=Model data used to quantify the roles of mean and transient flows in transporting heat across almost the entire Antarctic continental slope and shelf using an ocean/sea-ice model run at eddy- and tide-resolving (1/48 degree) horizontal resolution.Statement: The LLC_4320 simulation was conducted using the MIT general circulation model [Marshall et al., 1997a,b] on a global Latitude-Longitude-Cap (LLC) grid [Forget et al., 2015] with 1/48 degree horizontal grid spacing and 90 vertical levels. The horizontal grid spacing is less than 1 km over the entire Antarctic continental shelf and slope, with the exception of the tip of the Antarctic Peninsula, which is sufficient to simulate shoreward heat transfer by eddies [St-Laurent et al., 2013; Stewart and Thompson, 2015b]. The model includes the 16 largest-amplitude tidal components globally and partially resolves the internal wave spectrum [Rocha et al., 2016] and thus cross-slope excursions associated with baroclinic tides [Padman et al., 2009]. The LLC_4320 simulation is not directly constrained by observational data, but is a high-resolution continuation of the ECCO2 0.14 degree reanalysis product. The simulation spans September 2011–October 2012, and derives surface fluxes from ECMWF 1/6 degree operational analysis [ECMWF, 2011] combined with an annual climatology of continental runoff [Fekete et al., 2002]. An identically configured simulation was run using 1/24 degree horizontal grid spacing, spanning January 2011 – April 2013, and is referred to as LLC_2160. The model configuration files to understand the model grid layout, integration procedure, parameters etc can be found at http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/. The data are stored in .mat files separated by LLC face number (1, 2, 4 or 5), grid resolution (LLC2160 vs LLC4320), and averaging procedure (averaging all 6-hour snapshots together, '_6hsnapshots', or first averaging 6-hour snapshots into days and then averaging the days, '_dailyavg6h'). The LLC2160 model output is averaged from 03/06/2011 to 04/22/2013 (model time step 92160 to 1586400), while the LLC4320 output is averaged from 09/12/2011 to 11/15/2012 (model time step 10368 to 1495008).Statement: Each file contains the MITgcm grid vectors and time-averaged products of model output variables. Where necessary, the LLC grids have been rotated so that the x-coordinate points east, or approximately east, while the y-coordinate points north, or approximately north. For products between velocities and tracers, the tracers were interpolated linearly onto velocity points before the product was taken.&rft.creator=Stewart, Andrew &rft.creator=Klocker, Andreas &rft.date=2020&rft.coverage=westlimit=-180; southlimit=-80.00; eastlimit=-180; northlimit=-60.00&rft.coverage=westlimit=-180; southlimit=-80.00; eastlimit=-180; northlimit=-60.00&rft.coverage=uplimit=7000; downlimit=0&rft.coverage=uplimit=7000; downlimit=0&rft_rights= http://creativecommons.org/licenses/by/4.0/&rft_rights=http://i.creativecommons.org/l/by/4.0/88x31.png&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Graphic&rft_rights=Creative Commons Attribution 4.0 International License&rft_rights=http://creativecommons.org/international/&rft_rights=WWW:LINK-1.0-http--related&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Text&rft_rights=Cite data as: Stewart, A., Klocker, A. (2017). Circum-Antarctic shoreward heat fluxes derived from eddy- and tide-resolving simulation. Institute for Marine and Antarctic Studies, University of Tasmania. doi:10.4226/77/5a37035ea15b2&rft_rights=Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0&rft_subject=oceans&rft_subject=EARTH SCIENCE | OCEANS | OCEAN CIRCULATION | OCEAN CURRENTS&rft_subject=OCEANOGRAPHY&rft_subject=EARTH SCIENCES&rft_subject=Geophysical Fluid Dynamics&rft_subject=GEOPHYSICS&rft_subject=Physical Oceanography&rft_subject=vertical coordinate of center of cell&rft_subject=vertical coordinate of face of cell&rft_subject=Cell center separation along Z axis&rft_subject=Cell face separation along Z axis&rft_subject=vertical profile of reference density&rft_subject=longitude East of center of grid cell&rft_subject=longitude East of southwest corner of grid cell&rft_subject=latitude North of center of grid cell&rft_subject=latitude North of southwest corner of grid cell&rft_subject=Cell center separation in X across western cell wall&rft_subject=Cell face separation in X along southern cell wall&rft_subject=Cell center separation in Y across southern cell wal&rft_subject=Cell face separation in Y along western cell wall&rft_subject=Model bathymetry&rft_subject=cosine(alpha) relative to geographic direction at grid cell center&rft_subject=sine(alpha) relative to geographic direction at grid cell center&rft_subject=mask of tracer cell&rft_subject=mask of v cell&rft_subject=mask of u cell&rft_subject=Elevation of bottom of lowest model grid cell at tracer points&rft_subject=Elevation of bottom of lowest model grid cell at u-points&rft_subject=Elevation of bottom of lowest model grid cell at v-points&rft_subject=averaged zonal (relative to grid) velocity&rft_subject=averaged merid. (relative to grid) velocity&rft_subject=averaged vertical velocity&rft_subject=averaged potential temperature&rft_subject=averaged advective potential temperature flux due to u&rft_subject=averaged advective potential temperature flux due to v&rft_subject=averaged advective potential temperature flux due to w&rft_subject=averaged salinity&rft_subject=averaged advective salt flux due to u&rft_subject=averaged advective salt due to v&rft_subject=averaged advective salt flux due to w&rft_subject=averaged of u^2&rft_subject=averaged of v^2&rft_subject=averaged of w^2&rft.type=dataset&rft.language=English Access the data
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Cite data as: Stewart, A., Klocker, A. (2017). Circum-Antarctic shoreward heat fluxes derived from eddy- and tide-resolving simulation. Institute for Marine and Antarctic Studies, University of Tasmania. doi:10.4226/77/5a37035ea15b2

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Brief description

Model data used to quantify the roles of mean and transient flows in transporting heat across almost the entire Antarctic continental slope and shelf using an ocean/sea-ice model run at eddy- and tide-resolving (1/48 degree) horizontal resolution.

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Statement: The LLC_4320 simulation was conducted using the MIT general circulation model [Marshall et al., 1997a,b] on a global Latitude-Longitude-Cap (LLC) grid [Forget et al., 2015] with 1/48 degree horizontal grid spacing and 90 vertical levels. The horizontal grid spacing is less than 1 km over the entire Antarctic continental shelf and slope, with the exception of the tip of the Antarctic Peninsula, which is sufficient to simulate shoreward heat transfer by eddies [St-Laurent et al., 2013; Stewart and Thompson, 2015b]. The model includes the 16 largest-amplitude tidal components globally and partially resolves the internal wave spectrum [Rocha et al., 2016] and thus cross-slope excursions associated with baroclinic tides [Padman et al., 2009]. The LLC_4320 simulation is not directly constrained by observational data, but is a high-resolution continuation of the ECCO2 0.14 degree reanalysis product. The simulation spans September 2011–October 2012, and derives surface fluxes from ECMWF 1/6 degree operational analysis [ECMWF, 2011] combined with an annual climatology of continental runoff [Fekete et al., 2002]. An identically configured simulation was run using 1/24 degree horizontal grid spacing, spanning January 2011 – April 2013, and is referred to as LLC_2160.

The model configuration files to understand the model grid layout, integration procedure, parameters etc can be found at http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/.

The data are stored in .mat files separated by LLC face number (1, 2, 4 or 5), grid resolution (LLC2160 vs LLC4320), and averaging procedure (averaging all 6-hour snapshots together, '_6hsnapshots', or first averaging 6-hour snapshots into days and then averaging the days, '_dailyavg6h').

The LLC2160 model output is averaged from 03/06/2011 to 04/22/2013 (model time step 92160 to 1586400), while the LLC4320 output is averaged from 09/12/2011 to 11/15/2012 (model time step 10368 to 1495008).
Statement: Each file contains the MITgcm grid vectors and time-averaged products of model output variables. Where necessary, the LLC grids have been rotated so that the x-coordinate points east, or approximately east, while the y-coordinate points north, or approximately north. For products between velocities and tracers, the tracers were interpolated linearly onto velocity points before the product was taken.

Data time period: 2011-03-06 to 2012-11-15

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text: westlimit=-180; southlimit=-80.00; eastlimit=-180; northlimit=-60.00

text: uplimit=7000; downlimit=0

Subjects
Cell center separation along Z axis | Cell center separation in X across western cell wall | Cell center separation in Y across southern cell wal | Cell face separation along Z axis | Cell face separation in X along southern cell wall | Cell face separation in Y along western cell wall | EARTH SCIENCE | OCEANS | OCEAN CIRCULATION | OCEAN CURRENTS | Earth Sciences | Elevation of bottom of lowest model grid cell at tracer points | Elevation of bottom of lowest model grid cell at u-points | Elevation of bottom of lowest model grid cell at v-points | Geophysics | Geophysical Fluid Dynamics | Model bathymetry | Oceanography | Physical Oceanography | averaged advective potential temperature flux due to u | averaged advective potential temperature flux due to v | averaged advective potential temperature flux due to w | averaged advective salt due to v | averaged advective salt flux due to u | averaged advective salt flux due to w | averaged merid. (relative to grid) velocity | averaged of u^2 | averaged of v^2 | averaged of w^2 | averaged potential temperature | averaged salinity | averaged vertical velocity | averaged zonal (relative to grid) velocity | cosine(alpha) relative to geographic direction at grid cell center | latitude North of center of grid cell | latitude North of southwest corner of grid cell | longitude East of center of grid cell | longitude East of southwest corner of grid cell | mask of tracer cell | mask of u cell | mask of v cell | oceans | sine(alpha) relative to geographic direction at grid cell center | vertical coordinate of center of cell | vertical coordinate of face of cell | vertical profile of reference density |

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(SOURCE DATA ACCESS - model configuration files to understand the model grid layout, integration procedure, parameters etc.)

uri : http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/

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