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7 results for “Amundsen Sea Embayment”
Sensitivity maps of the Amundsen Sea Embayment to changes in external forcings using Automatic Differentiation
<p>Sensitivity maps of the final volume above flotation after 20 years to the basal friction coefficient, rheology factor, surface mass balance, and ocean-induced melting. These results were computed from STREAMICE and ISSM using automatic differentiation. See manuscript for complete description</p>
BISICLES ice-sheet model for the Amundsen Sea Embayment, Antarctica : ensemble simulations to 2050
<p>BISICLES ice-sheet model simulations for the Amundsen Sea Embayment. Full details of the model set-up and ensemble design are described in the attached manuscript which has been accepted for publication in Journal of Glaciology.<br> In brief, a 213-member ensemble of simulations was created by varying four different model parameters. The parameters are the u0 value in a regularised Coulomb friction law, the rate of imposed thinning of floating ice (∂h/∂t(Ωf)), and scaling factors for sliding and viscosity coefficients (<em>C</em> and ϕ) between 0.9 and 1.1. We attach a summary text file of results, as well as NetCDF files of simulated variables land ice thickness and u and v components of velocity.<br> <strong>ASE2050_bisicles.csv </strong>contains annual (2007 to 2050, columns 5 to 48) sea level equivalent (mm) mass losses of ice from the Pine Island and Thwaites Glacier catchment basins. The parameters, given in columns 1 to 4, respectively, are the u0 (m/a), the rate of imposed thinning of floating ice (m/a), and the scaling factors for sliding and viscosity coefficients.<br> The NetCDF files in <strong>ASE_BISICLES.tar.gz</strong> contain annual (2007 to 2050) simulated output variables for the Amundsen Sea region at a spatial resolution of 1 km, with one file per ensemble member. The variables follow the ISMIP6 naming protocol:<br> (https://www.climate-cryosphere.org/wiki/index.php?title=ISMIP6-Projections-Antarctica#A2.3_Model_output_variables_and_README_file).<br> We include state variables lithk, uvelmean, and vvelmean. Each file is named according to the variable, the simulation parameters, and the resultant 2050 SLE value of ice loss (mm). For example, <strong>lithk_ASE_BISICLES.uj_20.dhfdt_5.C_0.90.phi_0.90.slr_43.06.nc </strong>is the land ice thickness data for simulation u0=20 m/a, ∂h/∂t(Ωf) = 5 m/a, C scaled by 0.9, ϕ scaled by 0.9, and a final SLE of 43.06 mm.</p> <p> </p>
PROTECT-SLR BISICLES ice-sheet model simulations for Amundsen Sea Embayment to 2050
<p>BISICLES ice-sheet model results. The NetCDF files in ASE_BISICLES.tar.gz contain simulated output variables for the Amundsen Sea Embayment sector of the West Antarctic Ice Sheet at a spatial resolution of 1 km. The model start date is 2007 and the outputs are yearly to 2052. Each of the 30 simulations is a result of a different combination of model parameters. The parameters are the u<sub>0</sub> value in a regularized Coulomb friction law, the rate of imposed thinning of floating ice, and scaling factors for sliding and viscosity coefficients between 0.9 and 1.1. The final part of each dataset name gives the sea-level equivalent (SLE) of loss of ice above floatation within Pine Island and Thwaites Glacier catchment basins. Each output was randomly selected from a 2 cm 2050 SLE band of a histogram of a large ensemble of simulations.</p> <p>See the pdf report included for further details.</p>
Surface elevation change of the Amundsen Sea Embayment 1992-2019
<p>This dataset consists of grids of dh/dt computed over 3-year periods as well as annual grids of average dh and their corresponding uncertainties covering the period 1992 to 2019 using satellite radar altimetry data from ERS-1/2, ENVISAT and CryoSat-2 over the Amundsen Sea Embayment. This dataset has been prepared for the publication 'Amundsen Sea Embayment ice-sheet mass-loss predictions to 2050 calibrated using observations of velocity and elevation change' by Bevan et al. (2023, accepted), <em>Journal of Glaciology.</em></p> <p>The methods used for the derivation of this dataset are described in Shepherd et al, Trends in Antarctic ice sheet elevation and mass, 2019, GRL vol 46 issue 14 pp 8174-8183, <a href="https://doi.org/10.1029/2019GL082182">https://doi.org/10.1029/2019GL082182</a>. </p>
The effect of ice damage on Amundsen Sea Embayment projections
<p>==============================================================<br>The effect of ice damage on Amundsen Sea Embayment projections<br>==============================================================</p> <p>------------------------------<br>INTRODUCTION<br>------------------------------</p> <p>This dataset contains the data and scripts required to reproduce the figures and tables presented in the study:<br>"The effect of ice damage on Amundsen Sea Embayment projections".</p> <p>------------------------------<br>PROVIDED SCRIPTS: <br>------------------------------</p> <p>Kori-ULB contains all the necessary script to reproduce this study. Script are sorted by subfolder (ASE_scripts, MISMIP+_scripts, subroutines). The main scripts are:</p> <p> - 'KoriModelAll.m' and 'KoriInputParams.m': Kori-ULB ice flow model (more info at https://github.com/FrankPat/Kori-ULB)<br> - 'Init.m': Initialization script<br> - 'DamageForcing.m': Forcing script<br> - 'LHSensemble.mat': Parameter Ensemble. In this study only u0.<br> - 'MISMIPplus.m': MISMIP= script.<br> <br>------------------------------<br>PROVIDED DATA: <br>------------------------------</p> <p>Data are stored in the ASE and AIS folder. 1D fields are stored in 1D_DATA. 2D fields are stored in 2D_DATA. </p> <p>1D files:<br> law:<br> - 'gln' refers to glen flow law.<br> - 'bye' refers to Nye damage law.<br> - 'wrt' refers to Weertman damage law.</p> <p> scenario: <br> - 'pd' present-day forcing<br> - 'rcp26' RCP2.6 forcing<br> - 'rcp85' RCP8.5 forcing<br> <br> variables with time dimension:<br> - 'SLC' sea-level contribution in meters<br> - 'Ag' grounded ice extension in m^2<br> - 'n' number of simulations which are still running <br> <br> variables without time dimension:<br> - 'dBMB_2100-2015' Basal-mass balance between year 2100-2015 (in Gt)<br> - 'ddynC_2100-2015' Dynamical mass loss between year 2100-2015 (in mm)<br> <br>2D files:<br> We selected only the snapshot for RCP8.5 scenario which are presented in the main manuscript since they are too heavy. We can provide the rest of the data upon request.<br> <br>------------------------------<br>FIGURES: <br>------------------------------</p> <p>'FigureScript' contains the python script to reproduce the presented figures. The path to the data needs to be changed accordingly.</p>
Bathymetry of the Amundsen Sea Embayment
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MEaSUREs InSAR-Based Ice Velocity of the Amundsen Sea Embayment, Antarctica V001
This data set, part of the NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) Program, provides high-resolution, digital mosaics of ice motion in the Amundsen Sea Embayment (ASE) and West Antarctica, including the Pine Island, Thwaites, Haynes, Pope, Smith, and Kohler glaciers. The mosaics were assembled from interferometric synthetic-aperture radar (InSAR) data acquired in 1996, 2000, 2002, and 2006-2012 by various satellites. See <a href="https://nsidc.org/data/measures/aiv">Antarctic Ice Sheet Velocity and Mapping Data</a> for related data.
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