Angelika Humbert
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View article: Impact of Ice Topography, Basal Channels and Subglacial Discharge on Basal Melting Under the Floating Ice Tongue of 79N Glacier, Northeast Greenland
Impact of Ice Topography, Basal Channels and Subglacial Discharge on Basal Melting Under the Floating Ice Tongue of 79N Glacier, Northeast Greenland Open
The floating ice tongue of the 79N Glacier in Northeast Greenland has been thinning over the past two decades, with warning signs of a potential onset of disintegration. While previous studies primarily attribute the thinning of the ice sh…
View article: Insights into supraglacial lake drainage dynamics: triangular fracture formation, reactivation and long-lasting englacial features
Insights into supraglacial lake drainage dynamics: triangular fracture formation, reactivation and long-lasting englacial features Open
Supraglacial lake drainage through fractures delivers vast amounts of water to the ice sheet base, which occurs on timescales of hours. This study is concerned with the mechanisms of supraglacial lake drainage and how a particular area of …
View article: Outburst of a subglacial flood from the surface of the Greenland Ice Sheet
Outburst of a subglacial flood from the surface of the Greenland Ice Sheet Open
As Earth’s climate warms, surface melting of the Greenland Ice Sheet has intensified, increasing rates of sea-level rise. Observations and theory indicate that meltwater generated at the ice sheet surface can drain to its bed, where it flo…
View article: Coupling of the Ice-sheet and Sea-level System Model (version 4.24) with hydrology model CUAS-MPI (version 0.1) using the preCICE coupling library
Coupling of the Ice-sheet and Sea-level System Model (version 4.24) with hydrology model CUAS-MPI (version 0.1) using the preCICE coupling library Open
Accurate earth system models must include interactions between atmosphere, ocean, and continental ice sheets. To build such models, numerical solvers that compute the evolution of the different components are coupled. There are frameworks …
View article: Improved basal drag of the West Antarctic Ice Sheet from L-curve analysis of inverse models utilizing subglacial hydrology simulations
Improved basal drag of the West Antarctic Ice Sheet from L-curve analysis of inverse models utilizing subglacial hydrology simulations Open
The West Antarctic Ice Sheet (WAIS) is the focus of current research due to its susceptibility to collapse, which could potentially contribute to rising sea levels. To accurately predict future glacier evolution, precise ice sheet models a…
View article: The system of atmosphere, land, ice and ocean in the region near the 79N Glacier in northeast Greenland: synthesis and key findings from the Greenland Ice Sheet–Ocean Interaction (GROCE) experiment
The system of atmosphere, land, ice and ocean in the region near the 79N Glacier in northeast Greenland: synthesis and key findings from the Greenland Ice Sheet–Ocean Interaction (GROCE) experiment Open
The Greenland Ice Sheet has steadily lost mass over the past decades, presently representing the second-largest single contributor to global sea-level rise. In line with the rest of the Greenland Ice Sheet, the glaciers draining the northe…
View article: Coupled Ice Sheet-Ocean Modeling of the Filchner-Ronne sector using ISSM and FESOM-2
Coupled Ice Sheet-Ocean Modeling of the Filchner-Ronne sector using ISSM and FESOM-2 Open
Coupled ice sheet and ocean models are vital for projecting the dynamics of the Antarctic Ice Sheet and for predicting future sea level rise. The Filchner-Ronne sector of Antarctica contains a number of deep-bedded ice streams and glaciers…
View article: Speed variability of Wordie Bay outlet glaciers driven by subglacial hydrology
Speed variability of Wordie Bay outlet glaciers driven by subglacial hydrology Open
The Antarctic Peninsula (AP) accelerating mass loss is dominated by ice dynamics [1]. The most up-to-date research reveals a widespread increase in discharge from glaciers on the west coast of the Antarctic Peninsula since 2018 [2]. The we…
View article: Modelling Greenland’s subglacial hydrology using CUAS-MPI
Modelling Greenland’s subglacial hydrology using CUAS-MPI Open
Subglacial hydrology plays a key role in many glaciological processes. The amount of water at the glacier base and the properties of the hydraulic system modulate the basal sliding and, thus, ice discharge. The subglacial discharge of fres…
View article: Evolution of the 79N ice shelf
Evolution of the 79N ice shelf Open
The North-East Greenland Ice Stream is the largest ice stream of the Greenland Ice Sheet and drains an area of some 200,000 km2, which equates to ~12% of the ice sheet, and the entire catchment holds sufficient water to impact eustatic sea…
View article: Simulating Greenland Ice Slabs and Firn Aquifers with a 1D Firn Model
Simulating Greenland Ice Slabs and Firn Aquifers with a 1D Firn Model Open
The Greenland Ice Sheet (GrIS) has been losing mass at an accelerating rate, primarily due to meltwater runoff to the ocean. Firn, a porous transition layer between snow and ice, has the potential to buffer the GrIS’s contribution to…
View article: Reactivation of a Subglacial Channel Around the Grounding Zone of Roi Baudouin Ice Shelf, Antarctica
Reactivation of a Subglacial Channel Around the Grounding Zone of Roi Baudouin Ice Shelf, Antarctica Open
Subglacial water beneath the Antarctic Ice Sheet is often funneled via subglacial channels, which inject freshwater into ice‐shelf cavities where it interacts with ocean water. The temporal variability of this system has been poorly observ…
View article: On the Identification of the Basal Drag Parameter in Ice Sheet Models Using L‐Curves
On the Identification of the Basal Drag Parameter in Ice Sheet Models Using L‐Curves Open
The unknown and not observable basal drag distribution underneath the glaciers strongly impacts ice flow speeds and, with that, the ongoing mass loss of the Antarctic Ice Sheet. Therefore, basal drag is required for precise ice sheet model…
View article: Assessing supraglacial lake depth using ICESat-2, Sentinel-2, TanDEM-X, and in situ sonar measurements over Northeast and Southwest Greenland
Assessing supraglacial lake depth using ICESat-2, Sentinel-2, TanDEM-X, and in situ sonar measurements over Northeast and Southwest Greenland Open
Supraglacial lake development in Greenland consists of intricate hydrological processes, contributing not only to surface mass loss but also to a lowering of the surface albedo and changes in ice dynamics. While the estimation of lake area…
View article: Multi-annual patterns of rapidly draining supraglacial lakes in Northeast Greenland
Multi-annual patterns of rapidly draining supraglacial lakes in Northeast Greenland Open
Supraglacial lakes are known to undergo rapid drainages in which the contents of the lake are drained through ice hydrofracture to the glacier bed, typically within several hours. Despite the impact of this sudden loss of meltwater from th…
View article: Inland Summer Speedup at Zachariæ Isstrøm, Northeast Greenland, Driven by Subglacial Hydrology
Inland Summer Speedup at Zachariæ Isstrøm, Northeast Greenland, Driven by Subglacial Hydrology Open
The Northeast Greenland Ice Stream (NEGIS) has experienced substantial dynamic thinning in recent years. Here, we examine the evolving behavior of NEGIS, with focus on summer speedup at Zachariae Isstrøm, one of the NEGIS outlet glaciers, …
View article: AWI-ICENet1: a convolutional neural network retracker for ice altimetry
AWI-ICENet1: a convolutional neural network retracker for ice altimetry Open
The Greenland and Antarctic ice sheets are important indicators of climate change and major contributors to sea level rise. Hence, precise, long-term observations of ice mass change are required to assess their contribution to sea level ri…
View article: Calving front monitoring at a subseasonal resolution: a deep learning application for Greenland glaciers
Calving front monitoring at a subseasonal resolution: a deep learning application for Greenland glaciers Open
The mass balance of the Greenland Ice Sheet is strongly influenced by the dynamics of its outlet glaciers. Therefore, it is of paramount importance to accurately and continuously monitor these glaciers, especially the variation in their fr…
View article: Improved basal drag of the West Antarctic Ice Sheet from L-curve analysis of inverse models utilizing subglacial hydrology simulations
Improved basal drag of the West Antarctic Ice Sheet from L-curve analysis of inverse models utilizing subglacial hydrology simulations Open
The West Antarctic Ice Sheet (WAIS) is the focus of current research due to its susceptibility to collapse, which could potentially contribute to rising sea levels. To accurately predict future glacier evolution, precise ice sheet models a…
View article: The deglacial history of 79N glacier and the Northeast Greenland Ice Stream
The deglacial history of 79N glacier and the Northeast Greenland Ice Stream Open
The Northeast Greenland Ice Stream (NEGIS) is the main artery for ice discharge from the northeast sector of the Greenland Ice Sheet (GrIS) to the North Atlantic. Understanding the past, present and future stability of the NEGIS with respe…
View article: Comment on egusphere-2024-757
Comment on egusphere-2024-757 Open
Abstract. The Greenland Ice Sheet has steadily lost mass over the past decades, presently representing the second-largest single contributor to global sea-level rise. Even the glaciers draining the Northeast Greenland ice stream have been …
View article: Assessing the benefits of approximately exact step sizes for Picard and Newton solver in simulating ice flow (FEniCS-full-Stokes v.1.3.2)
Assessing the benefits of approximately exact step sizes for Picard and Newton solver in simulating ice flow (FEniCS-full-Stokes v.1.3.2) Open
Solving the momentum balance is the computationally expensive part of simulating the evolution of ice sheets. The momentum balance is described by the nonlinear full-Stokes equations, which are solved iteratively. We use the Picard iterati…
View article: Supraglacial lake drainage through gullies and fractures
Supraglacial lake drainage through gullies and fractures Open
Supraglacial lake drainage through fractures delivers vast amounts of water to the ice sheet base on timescales of hours. This study is concerned with the mechanisms of supraglacial lake drainage and how a particular area of Nioghalvfjerds…
View article: Assessing supraglacial lake depth using ICESat-2, Sentinel-2, TanDEM-X, and in situ sonar measurements over Northeast Greenland
Assessing supraglacial lake depth using ICESat-2, Sentinel-2, TanDEM-X, and in situ sonar measurements over Northeast Greenland Open
Supraglacial lake development in Greenland consists of intricate hydrological processes, contributing not only to surface mass loss, but also to a lowering of the surface albedo and changes in ice dynamics. While the estimation of lake are…
View article: The atmosphere-land/ice-ocean system in the region near the 79N Glacier in Northeast Greenland: Synthesis and key findings from GROCE
The atmosphere-land/ice-ocean system in the region near the 79N Glacier in Northeast Greenland: Synthesis and key findings from GROCE Open
The Greenland Ice Sheet has steadily lost mass over the past decades, presently representing the second-largest single contributor to global sea-level rise. Even the glaciers draining the Northeast Greenland ice stream have been observed t…
View article: Extreme melting at Greenland's largest floating ice tongue
Extreme melting at Greenland's largest floating ice tongue Open
The 79° North Glacier (Nioghalvfjerdsbrae, 79NG) is one of three remaining glaciers with a floating tongue in Greenland. Although the glacier has been considered exceptionally stable in the past, earlier studies have shown that the ice ton…
View article: A continuum mechanics perspective on the rheology of firn in the context of firn densification
A continuum mechanics perspective on the rheology of firn in the context of firn densification Open
While the complex nonlinear rheology of ice is well known and often discussed, for example in the context of large-scale ice sheet modeling, calving, and isotropy occurring at shear margins, the rheology of firn is often considered to be r…
View article: The changes of basal conditions on Fleming Glacier, Antarctic Peninsula, between 2008 and 202
The changes of basal conditions on Fleming Glacier, Antarctic Peninsula, between 2008 and 202 Open
The Wordie Ice Shelf (WIS) in the Antarctic Peninsula (AP) has continued to retreat since 1966, and it almost completely disintegrated in the late 1990s. Although the main supply glacier of the WIS, the Fleming Glacier (FG), did not respon…
View article: Validation of effective subglacial hydrology models
Validation of effective subglacial hydrology models Open
The presence of subglacial lubrication networks at the ice-bed interface is a key component for ice sheet dynamics. A subglacial network has the potential to facilitate rapid ice flow through reduction in basal friction, possibly resulting…