Elmer/Ice News

Elmer/Ice @ EGU2024

egu plainElmer/Ice is prominently present at this year's EGU General Assembly with a dedicated splinter meeting wherein the 12th Elmer/Ice User Meeting will take place (Thu, 18 Apr, 12:45–13:45 Room 2.83).

Here is the list of talks related to Elmer/Ice applications:

Monday 15 Apr:

14:10–14:20, Room 1.61/62 (CR2.1): Chen Zhao et al.,  Subglacial Water Pressure Reshapes projected Antarctic Sea-Level Rise 

14:20–14:30, Room 1.61/62 (CR2.1): Carlos Martin and Mark Hehlen, An Enthalpy-Hydrology Coupled 3D full-Stokes Flow Model of Thwaites’ Eastern Shear Margin

Tuesday 16 Apr:

08:35–08:45, Room L3 (CR2.2): Clara Burgard et al., When will the Antarctic ice shelves not be viable anymore?

10:45–12:30, Hall X5 | X5.215 (CR2.1): Darrel Swift et al., The importance of bed roughness on ice sheet flow investigated using a full-Stokes ice flow model

 
15:25–15:35, Room 1.61/62 (CR1.1): Marin Kneib, Amaury Dehecq et al., Distributed surface mass balance of the avalanche-fed Argentière glacier, French Alps
 
16:15–18:00, Hall X5 | X5.160 (CR1.3): Yu Wang, et al., Parameterization Solutions for Basal Melting at the Grounding Line in Ice Flow Models 

Wednesday 17 Apr:

11:50–12:00, Room 1.61/62 (CR2.4): Thomas Zwinger, et al., A coupled model of glacier-ice dynamics, bed-hydrology and bedrock groundwater flow including heat-transfer

15:25–15:35, Room 1.61/62 (CR1.3): Iain Wheel, et al., Simulating 3D calving dynamics at Thwaites Glacier

16:15–18:00, Hall X5 | X5.243 (CR2.4), Rupert Gladstone, et al., Simulating the impact of Antarctic subglacial hydrology on ice sheet evolution

Thursday 18 Apr:

10:55–11:05, Room L3(CR2.3): Anna Crawford, et al., Calving dynamics and mélange buttressing conditions at the Thwaites Glacier calving face

12:45–13:45, Room 2.83: Elmer/Ice users meeting

14:10–14:20, Room L3 (CR2.3): Douglas Benn, et al., Tidewater Glaciers and Ice Shelves as Self-Organising Systems

17:20–17:30, Room 1.34 (CR7.7): Qin Zhou, et al., Ocean-driven basal channel growth at Fimbulisen

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Elmer/Ice used in ice core based accumulation reconstruction for the Caucasus

cp 20 237 2024 f03 webIn this study, is presented a seasonally resolved accumulation record spanning from 1750 to 2009 CE, based on a 181.8 m ice core obtained from the Elbrus Western Plateau in the Caucasus. Various methods are implemented to account for uncertainties associated with glacier flow, layer thinning, and dating. Particularly, the upstream effect is accounted for with the help of Elmer/Ice. Since the ice core includes layers that were deposited upstream of the drilling site, where annual snow accumulation conditions may differ from those at the drilling site, it is crucial to identify the ice core catchment area in order to investigate the connection between the ice core data and surface accumulation. To account for this upstream effect, were calculated the backward trajectories of the ice and firn particles positioned along a vertical line segment connecting the drill site and the bedrock. The trajectories are reconstructed based on the modeled glacier velocity field. The velocity field is simulated on the base of a 3-D full Stokes ice-flow model with the firn rheological law. A steady-state simulation with fixed glacier geometry is performed. The mathematical formulation of the ice-flow problem includes the Stokes and the volume balance evolution equations, the stress-free surface boundary condition, and the no-slip bedrock boundary condition. The model utilizes a smoothed vertical profile of density inferred from the 2009 Elbrus ice core. Based on the simulation, it was determined that the sources of the backward trajectories are located on the glacier surface close enough to the drill site. This result ascertains the representativeness of the ice core material as a proxy for surface accumulation rates.

Read more: Mikhalenko V., S. Kutuzov, P. Toropov, M. Legrand, S. Sokratov, G. Chernyakov, I. Lavrentiev, S. Preunkert, A. Kozachek, M. Vorobiev, A. Khairedinova and V. Lipenkov, 2024. Accumulation rates over the past 260 years archived in Elbrus ice core, Caucasus,Clim. Past 20, 237-255. doi:10.5194/cp-20-237-2024

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Controls on calving at a Greenland tidewater glacier

Choosing the location Sermeq Kujalleq (Store Glacier), the calving behaviour of a typical Greenlandic tidewater glacier  was Difference in first principal deviatoric stress for undercut ‘retreated’ configurations compared with the non-undercut case, and fractures modelled in HiDEMinvestigated using the crevasse-depth (CD) calving law in Elmer/Ice and compared to results with the discrete element model HiDEM as well as observational data. This particular glacier has a stable front position due to a compressive arch between lateral pinning points,  which regularly lets ice that advances seawards across this arch calve back, whereas any undercut land inwards is countered by a readvance to the stable front position, which acts as an attractor between unstable super-critical and sub-critical regimes. It turns out that such a self-organising critical system can be very well described with a CD calving law in combination with a position (rather than a rate-based) calving algorithm in a continuum ice-flow model (Elmer/Ice) that resolves the major stress components at the ice front.

Read more:

Benn, D.I., J. Todd, A. Luckman, S. Bevan, T.R. Chudley, J. Åström, T. Zwinger, S. Cook, P. Christoffersen, 2023. Controls on calving at a large Greenland tidewater glacier: stress regime, self-organised criticality and the crevasse-depth calving lawJournal of Glaciology 1-17. doi:10.5194/10.1017/jog.2023.81


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