Loading VESL Page loader
Sea Level rise resulting from removing the ice in Antarctica and Greenland, in meters.

Controls

Primary Controls

0 m

Antarctica Controls

m/a

Greenland Controls

m/a

Info

Introduction

This simulation explores the impact of collapsing polar ice sheets (Greenland and Antarctica) and their impact on global mean sea level rise, along with shrinkage in livable area around the world. Here, we look at US coastal areas, and how shoreline would retreat if Greenland and Antarctica were to dramatically decrease in volume.

This scenario is hypothetical, and by no means fully representative of all the processes involved in both the evolution of polar ice sheets, and the way sea level rises differently in various parts of the world. It does not for example account for local subsidence of the ground, flooding, erosion of the shorelines, glacial isostatic rebound, negative feedbacks from the atmosphere, etc. It is, however, meant to assess the sensitivity of local sea level rise to melting of polar regions.

Datasets Used for the Simulation

  • Digital elevation model for US coastal areas: Global Land One-km Base Elevation Project anisotropically interpolated onto unstructured mesh ranging from 500 m to 100 km resolution.
  • US overlay: True Marble 4km. resolution.

  • Greenland Surface elevation from Bamber et al., 2001.
  • Greenland Bedrock elevation from Bamber et al., 2001.
  • Other Greenland datasets found at the SeaRISE Present Day Greenland webpage.

  • Antarctica Surface elevation from Bamber et al. (The Cryosphere, 2009) and Griggs and Bamber. (The Cryosphere, 2009).
  • Antarctica Bedrock elevation from BEDMAP1+ -> merge of BEDMAP1 (Lythe et al, 2000) and bathymetry grids from Nitsche (LDEO) et al. 2007 and Tara Deen (BAS).
  • Other Antarctica datasets found at the SeaRISE Present Day Antarctica webpage.

Model Settings

  • Greenland mesh at 20 km resolution split into 3 areas (North, Center and South).
  • Antarctica mesh at resolution ranging from 20 to 60 km, split into 4 areas (NorthWest, NorthEast, SouthWest and SouthEast).
  • Computation of SLR using volume above hydrostatic equilibrium and conversion to global mean sea level rise from global ocean surface area. New US coastline computed using simple comparison between surface height and new sea level.
  • Code to compute volume above floatation:
  • 													function VolumeAboveFloatation(md){ 
    														var vol = 0;
    														var di = md.materials.rho_ice / md.materials.rho_water;
    													
    														for(var i = 0; i < md.mesh.numberofvertices; i++){
    															if(md.geometry.base[i] > 0){
    																vol += (md.geometry.surface[i] - md.geometry.base[i]) * area[i];
    															}
    															else{
    																var sh = (di - 1) / di * md.geometry.base[i];
    																if (md.geometry.surface[i] > sh){
    																	vol += (md.geometry.surface[i] - sh) * area[i];
    																}
    															}
    														}
    														return vol;
    												}
    												
  • Code to convert to global mean sea level rise:
  • 													/* Figure out the new volumes of the polar ice caps: */
    													var offset = 0.01;
    													var vg = VolumeAboveFloatation(mdgre);
    													var va = VolumeAboveFloatation(mdant);
    	
    													/* Overall volume change: */
    													var deltav = (vg - vgi) + (va - vai);
    	
    													/* Overall water equivalent volume change: */
    													deltav = deltav * di;
    	
    													/* equivalent slr: */
    													// 361 million square kilometers ocean surface 
    													// 10^6 * 10^6 (from etopo)
    													var newheight = offset - deltav / (361.9 * Math.pow(10,12)); 
    												

How to Run the Simulation

Access the Antarctica and Greenland using the left and right-pointing arrows (portrait viewport) and remove a certain amount of ice (relative percentage of the overall mass) using the corresponding slider (in the "Controls" drawer pane). The ice can be removed from all basins or from a specific basin by using the select menu. The resulting shrinkage of the ice sheets will be displayed in the initial frame, along with shoreline retreat and global mean sea level rise. Specific US coastal areas can be selected using the "Region" select menu.

Legend

Toggle fullscreen
Zoom in
Zoom out
Share
Tutorial
LET'S GO Show/hide controls
INFO Show/hide info

Feedback

If you have any questions or feedback, please send us an email.

data marker data marker data marker