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10 results for “Helheim”
Width-averaged terminus position of Helheim Glacier, 2002-2019
<p>Terminus position of Helheim Glacier (2002-2019) in terms of a width-averaged distance [km] from an upstream flux gate. Positions are identified from satellite imagery---primarily Moderate Imaging Spectroradiometer (MODIS) imagery, but incorporating Landsat and Sentinel-2 imagery when available. Terminus positions are derived manually until 2010 (Schild & Hamilton, 2013) and using a semi-automated technique thereafter (Foga, Stearns & van der Veen, 2014). </p>
Helheim Seismic data August 2014-2015
<p>Seismic traces for the BHE/BHN/BHZ channels (Easting, Northing and Vertical components) from August 2014 - August 2015 at Helheim Glacier (66.4N 38.2W). The locations of the seismometers HEL1-HEL4 and more details about the seismometers are given in a Cryosphere journal article (Mei, M. J., Holland, D. M., Anandakrishnan, S., and Zheng, T.: Calving localization at Helheim Glacier using multiple local seismic stations, The Cryosphere, 11, 609-618, doi:10.5194/tc-11-609-2017, 2017) that uses this data.</p>
Velocity of Greenland's Helheim Glacier controlled both by terminus effects and subglacial hydrology with distinct realms of influence
<p>Description of files contained in this archive:</p> <p><strong> </strong></p> <p>SHAKTI-ISSM model output</p> <p>Winter spin-up</p> <p>Helheim_SHAKTI_N_2_1yr_H10.mat</p> <ul> <li> <p>Winter base state spin-up simulation, final state serves as initial conditions for seasonal simulations</p> </li> </ul> <p><strong> </strong></p> <p>Seasonal hydrology-forced simulations</p> <p>Helheim_big_seasonal_low.mat</p> <ul> <li> <p>Seasonal simulation</p> </li> </ul> <p>Helheim_big_seasonal_firn.mat</p> <ul> <li> <p>Seasonal + firn aquifer simulation</p> </li> </ul> <p>Helheim_big_seasonal_bigmelt.mat</p> <ul> <li> <p>Enhanced melt simulation</p> </li> </ul> <p><strong> </strong></p> <p>Seasonal terminus-forced simulations</p> <p>Helheim_termforce_year2_v3.mat</p> <ul> <li> <p>Termforce simulation</p> </li> </ul> <p>Helheim_termforce_seasonal_v3.mat</p> <ul> <li> <p>Seasonal + termforce simulation</p> </li> </ul> <p>Helheim_termforce_seasonal_firn_v3.mat</p> <ul> <li> <p>Seasonal + firn aquifer + termforce simulation</p> </li> </ul> <p>Helheim_termforce_seasonal_bigmelt2_v3.mat</p> <ul> <li> <p>Enhanced melt + termforce simulation</p> </li> </ul> <p><strong> </strong></p> <p>Sensitivity simulations</p> <p>MOLHO_365d.mat</p> <ul> <li> <p>Winter base state spin-up simulation using MOLHO instead of SSA</p> </li> </ul> <p>A15_365d.mat</p> <ul> <li> <p>Winter base state spin-up simulation with flow law parameter for -15 deg C instead of -10 deg C</p> </li> </ul> <p>Helheim_br1_lr100_1yr.mat</p> <ul> <li> <p>Winter base state spin-up simulation including opening by sliding, final state serves as initial conditions for seasonal simulations</p> </li> </ul> <p>Helheim_br1_lr100_bigmelt.mat</p> <ul> <li> <p>Enhanced melt simulation including opening by sliding</p> </li> </ul> <p><strong><br><br></strong></p> <p>Model setup scripts (to be used with ISSM in MATLAB)</p> <p>runme_Helheim_inversion.m</p> <ul> <li> <p>Script to perform stress balance inversion</p> </li> </ul> <p>Helheim_CG.exp</p> <ul> <li> <p>Model domain coordinates</p> </li> </ul> <p>Greenland_clean.par</p> <ul> <li> <p>Parameter file</p> </li> </ul> <p>merra2_runoff.mat</p> <ul> <li> <p>14-day smoothed meltwater input</p> </li> </ul> <p>runme_Helheim_shaktiissm_startfrominversion_clean.m</p> <ul> <li> <p>Script to perform coupled SHAKTI-ISSM simulation, beginning from a model set up in the inversion script</p> </li> </ul> <p>runme_Helheim_continue_shaktiissm_clean.m</p> <ul> <li> <p>Script to continue a coupled SHAKTI-ISSM simulation, beginning from the end state of a previous SHAKTI-ISSM simulation</p> </li> </ul> <p>runme_Helheim_continue_seasonal_clean.m</p> <ul> <li> <p>Script to run a transient seasonal coupled SHAKTI-ISSM simulation, beginning from the end state of a winter SHAKTI-ISSM spin-up simulation</p> </li> </ul> <p><strong> </strong></p> <p>Plotting scripts</p> <p>load_models_Helheim_termforce.m</p> <ul> <li> <p>Load model output</p> </li> </ul> <p>plot_timeseries_coupled_point_paper_clean.m</p> <ul> <li> <p>Plot time series of effective pressure, velocity, and meltwater input. Also plots scatter plot of velocity vs. effective pressure</p> </li> </ul> <p>plot_pm_logscale.m</p> <ul> <li> <p>Plot difference in velocity compared to winter state with +/- log10 color scale</p> </li> </ul> <p>plot_pm_logscale_N.m</p> <ul> <li> <p>Plot difference in effective pressure compared to winter state with +/- log10 color scale</p> </li> </ul>
Graph neural network emulator for modeling of ice dynamics and calving in the Helheim Glacier, Greenland
<p>These files include the following codes and datasets for developing graph neural network (GNN) emulators for the Ice-sheet and Sea-level System Model (ISSM) for modeling ice sheet dynamics and calving in the Helheim Glacier, Greenland.</p> <ul> <li>ISSM_DGL_Helheim.py: Python file for training GNN models</li> <li>ISSM_CNN_Helheim.py: Python file for training convolutional neural network (CNN) models</li> <li>*.mat: Datasets of the ISSM transient simulation results</li> </ul>
Helheim Terminus Camera Images 2009-2015
<p>Images collected by two cameras positioned close to the terminus of Helheim Glacier, South East Greenland between 2009 and 2015.</p>
Data For: Grounding zone of Helheim Glacier, Greenland, from terrestrial radar interferometry
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Processed ApRES displacement of internal reflectors at Helheim Glacier in August, 2016.
<p>This is the processed ApRES product using dataset collected in August, 2016.</p> <p>A readme file is included to extract displacement time series at a given point. </p>
Seismic waveform data collected at Helheim Glacier between Aug, 2012 and Jun, 2017 (part 1)
<p> Raw seismic waveforms (in miniSEED format) at HEL1 station collected at Helheim Glacier between 2012 and 2017 (part 1)</p>
Line of Sight (LOS) velocity obtained from terrestrial radar interferometer at Helheim Glacier
<p>1h-interval LOS ice flow speed processed using TRI dataset collected at Helheim Glacier in August, 2016.</p> <p> </p>
Seismic waveform data collected at Helheim Glacier between Aug, 2012 and Jun, 2017 (part 2)
<p>Raw seismic waveforms (in miniSEED format) at HEL1 station collected at Helheim Glacier between 2012 and 2017 (part 2)</p>
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