Preprints
Filtering by Subject: Glaciology
Revisiting earlier predictions of glacier retreat: The case of Langfjordjøkelen
Published: 2022-11-09
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics
European glaciers constitute a part of the climate system that is bound to greatly change in the course of the 21st century. Recent length-change observations from Langfjordjøkelen in northern Norway confirm the earlier predictions of Charalampidis (2012), who identified the glacier’s disequilibrium with climate and hence extensive committed ice loss in the 21st century. Simulations suggest that, [...]
Remote sensing-derived time series of transient snowline altitudes for High Mountain Asia, 1986–2021
Published: 2022-10-24
Subjects: Earth Sciences, Glaciology
This study presents a new dataset of remote sensing-derived Transient Snowline Altitude (TSLA) measurements for glaciers in High Mountain Asia. We use the Google Earth Engine to obtain TSLA data for approx. 28 · 104 glaciers larger than 0.5 km². After filtering and postprocessing, the dataset comprises ca. 9.66 million TSLA measurements with an average of 341 ± 160 measurements per glacier, [...]
The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula
Published: 2022-10-19
Subjects: Earth Sciences, Geology, Geomorphology, Glaciology, Physical Sciences and Mathematics, Sedimentology
The timing and impact of deglaciation and Holocene readvances on the terrestrial continental margins of the Antarctic Peninsula have been well-studied but are still debated. Potter Peninsula on King George Island (Isla 25 de Mayo), South Shetland Islands (SSI), NW Antarctic Peninsula has a detailed assemblage of glacial landforms and stratigraphic exposures for constraining deglacial landscape [...]
Distributed Acoustic Sensing in a Greenlandic Outlet Glacier: Developing Machine Learning Approaches to Benefit Cryoseismic Data Analysis
Published: 2022-10-08
Subjects: Geophysics and Seismology, Glaciology, Other Computer Sciences
The recognition of Distributed Acoustic Sensing (DAS) as a valuable tool for glaciological seismic applications is growing. However, besides the logistical challenges of installing fibre-optic cable, the volume of DAS data that can be collected in a field campaign poses computational challenges. In this paper, we show the potential of active-source DAS to image and characterise subglacial [...]
Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016–2021
Published: 2022-09-08
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics
Greenland glaciers have three primary seasonal ice flow patterns, or “types”: terminus driven, runoff driven, and runoff adapting. To date, glacier types have been identified by analyzing flow at a single location near the terminus; information at all other locations is discarded. Here, we use principal component (PC) / empirical orthogonal function (EOF) analysis to decompose multi-year time [...]
Variational inference of ice shelf rheology with physics-informed machine learning
Published: 2022-09-06
Subjects: Earth Sciences, Glaciology, Other Mathematics, Other Statistics and Probability, Physical Sciences and Mathematics
Floating ice shelves that fringe the coast of Antarctica resist the flow of grounded ice into the ocean. One of the key factors governing the amount of flow-resistance provided by an ice shelf is the rigidity of the ice that constitutes it. Ice rigidity is highly heterogeneous and must be calibrated from spatially-continuous surface observations assimilated into an ice flow model. Moreover, [...]
Ocean Surface Gravity Wave Excitation of Flexural Gravity and Extensional Lamb Waves in Ice Shelves
Published: 2022-08-30
Subjects: Earth Sciences, Glaciology, Numerical Analysis and Scientific Computing
Flexure and extension of ice shelves in response to incident ocean surface gravity waves have been linked to iceberg calving, rift growth, and even disintegration of ice shelves. Most modeling studies utilize a plate bending model for the ice, focusing exclusively on flexural gravity waves. Ross Ice shelf seismic data shows not only flexural gravity waves, with dominantly vertical displacements, [...]
Atlantic Water intrusion triggers rapid retreat and regime change at previously stable Greenland glacier
Published: 2022-08-04
Subjects: Earth Sciences, Glaciology
Ice discharge from Greenland’s marine-terminating glaciers contributes to half of all mass loss from the ice sheet, with numerous mechanisms proposed to explain their retreat. Here, we examine K.I.V Steenstrups Nordre Bræ (‘Steenstrup’) in Southeast Greenland, which, between 2018—2021, retreated ~7 km, thinned ~20%, doubled in discharge, and quadrupled in flow speed. This rate of acceleration is [...]
Ascent rates of 3D fractures driven by a finite batch of buoyant fluid
Published: 2022-06-20
Subjects: Fluid Dynamics, Geology, Glaciology, Mechanics of Materials, Volcanology
Propagation of fluid-filled fractures by fluid buoyancy is important in a variety of settings, from magmatic dykes and veins to water-filled crevasses in glaciers. Industrial hydro-fracturing utilises fluid-driven fractures to increase the permeability of rock formations, but few studies have quantified the effect of buoyancy on fracture pathways in this context. Analytical approximations for the [...]
Surging vs. streaming: the dual fast ice flow response to variations in efficiency of the subglacial drainage landsystem
Published: 2022-05-24
Subjects: Geomorphology, Glaciology
Observation and modelling have long contributed to associate surging and streaming of glaciers with glacier thermal regime, variations in meltwater availability and pressure and mechanical coupling at their beds. Using experimental modelling and palaeoglaciological mapping, we explore how the development of subglacial drainage landsystems controls variations in drainage efficiency and ice flow [...]
Complex motion of Greenland Ice Sheet outlet glaciers with basal temperate ice
Published: 2022-05-19
Subjects: Glaciology
Uncertainty associated with ice motion plagues sea-level rise predictions. Much of this uncertainty arises from imperfect representations of physical processes including basal slip and internal ice deformation, with ice-sheet models largely incapable of reproducing borehole-based observations. To investigate further, we model isolated 3D domains from fast-moving (Sermeq Kujalleq or Store Glacier) [...]
The CREp 36Cl exposure age calculator: development version “dev”
Published: 2022-05-04
Subjects: Geochemistry, Geology, Geomorphology, Glaciology, Sedimentology, Tectonics and Structure, Volcanology
Chlorine-36 (36Cl) is currently the only in situ cosmogenic nuclide applicable in carbonates, Ca- and K-rich feldspars and aphyric silicate rocks. Because the production reactions of 36Cl are more numerous and complex than those of other cosmogenic nuclides (e.g. 10Be, 3He), comprehensive and user-friendly calculators are essential for routine application of 36Cl to Earth surface research [...]
Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia
Published: 2022-03-29
Subjects: Earth Sciences, Geochemistry, Geology, Geomorphology, Glaciology, Hydrology, Paleobiology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy, Volcanology
We undertook multiproxy analyses on two sediment cores from Lago Pato, a small lake basin at 51°S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake level change in the TdP and Última Esperanza region over the last ~30,000 cal a BP (30 ka). Lago Pato is situated in a region overridden by the Southern Patagonian Icefield [...]
Decoupling between strain localisation and the microstructural record revealed by in-situ strain measurements in polycrystalline ice
Published: 2022-03-28
Subjects: Earth Sciences, Glaciology, Tectonics and Structure
We explore the links between strain localisation and microstructural evolution in ice Ih deformed by dislocation creep. Using digital image correlation (DIC), we monitored the evolution of the strain field in two coarse-grained columnar ice samples deformed by creep (uniaxial compression at constant load) at -7 °C and 0.5 MPa up to 9.5% bulk shortening. After a brief transient (<0.2% bulk [...]
Greenland ice sheet vulnerability under diverse climatic warming scenarios
Published: 2022-03-26
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics
Sea-level rise of even one meter will have drastic global impacts. Melting the Greenland Ice Sheet (GIS) would raise sea level by 7.4 meters. There is an urgent need to improve predictions of how quickly the GIS will contribute its first meter of sea-level rise, and from where on the ice sheet that water will come. Estimating the volume of Greenland ice that was lost during past warm periods [...]