We explore and compare the capabilities limitations of different optical sensors (Sentinel-2/ESA, Landsat 7/8/USGS, Ven μ s/CNES-ISA, Pléiades/AirbusD&S Planet Labs images) for mapping surface speeds mountain glaciers on a regional scale. present here our automated workflow designed to download data from institutional or commercial servers, prepare images, launch feature tracking algorithm, calibrate glacier speeds, post-processing treatment obtain filtered time-averaged velocity maps....

Abstract. We present projections of West Antarctic surface mass balance (SMB) and melt to 2080–2100 under the RCP8.5 scenario based on a regional model at 10 km resolution. Our are built by adding CMIP5 (Coupled Model Intercomparison Project Phase 5) multi-model-mean seasonal climate-change anomaly present-day boundary conditions. Using an has advantage reduce biases, perfect-model test reveals that our approach captures most characteristics future changes despite 16 %–17 % underestimation...

Abstract. Theoretical and numerical work has shown that under certain circumstances grounding lines of marine-type ice sheets can enter phases irreversible advance retreat driven by the marine sheet instability (MISI). Instances such have been found in several simulations Antarctic Ice Sheet. However, it not assessed whether are already undergoing MISI their current position. Here, we conduct a systematic stability analysis using three state-of-the-art models: Úa, Elmer/Ice, Parallel Sheet...

Abstract. Identifying and quantifying irreducible reducible uncertainties in the Antarctic Ice Sheet (AIS) response to future climate change is essential for guiding mitigation adaptation policy decision. However, impact of internal variability, resulting from processes intrinsic system, remains poorly understood quantified. Here, we characterise both atmospheric oceanic variability a selection three Coupled Model Intercomparison Project Phase 6 (CMIP6) models (UKESM1-0-LL, IPSL-CM6A-LR,...

Abstract. Theoretical and numerical work has firmly established that grounding lines of marine-type ice sheets can enter phases irreversible advance retreat driven by the marine sheet instability (MISI). Instances such have been found in several simulations past future evolution Antarctic Ice Sheet. However, hitherto stability regime Sheet their current position not assessed. Here we conduct a systematic analysis all to determine if they are currently undergoing through MISI. To do this,...

Abstract. We present projections of West-Antarctic surface mass balance (SMB) and melting to 2080–2100, under the RCP8.5 scenario based on a regional model at 10 km resolution. Our are built by adding CMIP5 (5th Coupled Model Intercomparison Project) multi-model-mean seasonal climate-change anomaly present-day boundary conditions. Using an has advantage reduce biases, perfect-model test reveals that our approach captures most characteristics future changes, despite 16–17 % underestimation...

Abstract. Identifying and quantifying irreducible reducible uncertainties in the Antarctic Ice Sheet response to future climate change is essential for guiding mitigation adaptation policy decision. However, impact of internal variability, resulting from processes intrinsic system, remains poorly understood quantified. Here, we characterise both atmospheric oceanic variability a selection three CMIP6 models (UKESM1-0-LL, IPSL-CM6A-LR MPI-ESM1.2-HR) estimate their on contribution sea level...

Modeling of ever increasingly complex industrial processes requires insatiable computing power. To keep reasonable calculation times, one way is to decompose the domain into smaller ones and solve each subdomain on independent processors. The message passing interface (MPI) protocol ParMetis library are two helpful tools achieve such a task. paper presents an algorithm that uses both parallelize ICE3D, finite volume scheme for ice accretion aircraft, module well-known code FENSAP-ICE....

Ice Memory is an international project aiming at creating a global ice archive sanctuary in Antarctica. The design of perennial subsurface storage space for the cores cornerstone this project. Here, we use ice/firn flow model to investigate possible solutions that would meet specific requirements To end, consider two extreme cases terms rigidity facility: cave excavated into firn and perfectly rigid container buried within it. We focus on rate sinking facility as well closure evolution...

The stability of the grounding lines Antarctica is a fundamental question in term sea level rise strong mass loss Antarctic Ice Sheet (AIS) recent years has raised concerns about possibility ice sheet reaching tipping point, beyond which it would experience rapid and irreversible mass. Such point could be triggered by combination external forcing factors, including continued warming ocean atmosphere, as well changes dynamics. As shown Urruty et al. (in review), current retreat mainly due to...

Ice-calving plays a major role in the mass balance of water-ending glaciers. Thus, it is crucial to have well-adapted calving law for simulations over long periods. Due its dependence on several physical parameters, this phenomenon usually poorly parametrized long-term numerical simulations. A worldwide model intercomparison project ice damage and calving, CalvingMIP (see https://github.com/JRowanJordan/CalvingMIP/wiki), proposed as part European project, PROTECT. The aims evaluate...

<p>We present Surface Mass Balance (SMB) and surface melt rates projections in West Antarctica for the end of 21<sup>st</sup> century using MAR regional atmosphere firn model (Gallée 1994; Agosta et al. 2019) forced by a CMIP5-rcp85 multi-model-mean seasonal anomaly added to ERA-Interim 6-hourly reanalysis.</p><p> </p><p>First all, we assess validity our projection...

<p>The stability of the grounding lines Antarctica is a fundamental question in glaciology, because current are some locations at edge large marine basins, and have been hypothesized to potentially undergo irreversible retreat response climate change. This could global consequences raise sea levels by several metres. However, their long-term reversibility for ice sheet geometry has not yet questioned, i.e., if present-day climatology kept constant, will remain close currently...

<p>The stability of the grounding lines Antarctica is a fundamental question in glaciology, because current are some locations at edge large marine basins, and have been hypothesized to potentially undergo irreversible retreat response climate change. This could global consequences raise sea levels by several metres. However, their reversibility for geometry has not yet questioned, i.e. if pushed very slightly, they able recover former...

<p>Ice mass loss from Antarctic Ice Sheet is increasing, accelerating its contribution to global sea level rise. Interactions between the ice shelves (the floating portions of sheet that buttress grounded ice) and ocean are key processes in this loss. The most rapid recent observed Amundsen Sea, where buttressing declining as small being thinned rapidly by melting driven inflows warm Circumpolar Deep Water, leading important grounding line retreats. Recent research indicates...

<p>Calving is one of the most important processes that induce mass loss in Greenland and Antarctic ice shelves. These major discharges modify calving front position with an impact over whole stress regime these glaciers. Because rate depends on several physical parameters, having empirical parameterization for simulations long periods a big challenge. We study using open-source finite element, Elmer/Ice...

<p>The stability of the grounding lines Antarctica is a fundamental question in glaciology, because current some locations are at edge large marine basins, and have been hypothesized to potentially undergo irreversible retreat response climate change. This could global consequences raise sea levels by several metres. If Antarctic their configuration close being unstable, small change external forcing, e.g. reduction ice shelf buttressing resulting from an increase melt rates,...