The monitoring of Earth’s and planetary surface elevations at larger finer scales is rapidly progressing through the increasing availability resolution digital elevation models (DEMs). Surface observations are being used across an expanding range fields to study topographical attributes their changes over time, notably in glaciology, hydrology, volcanology, seismology, forestry geomorphology. However, DEMs frequently contain large-scale instrument noise varying vertical precision that...

Abstract Permafrost and glaciers in the high Arctic form an impermeable ‘cryospheric cap’ that traps a large reservoir of subsurface methane, preventing it from reaching atmosphere. Cryospheric vulnerability to climate warming is making releases this methane possible. On Svalbard, where air temperatures are rising more than two times faster average for Arctic, retreating leaving behind exposed forefields enable rapid escape. Here we document how methane-rich groundwater springs have formed...

The processes associated with the release of CH4 and CO2 from sub-permafrost groundwaters are considered through a year-long monitoring investigation at terrestrial seepage site in West Spitsbergen. is an open system pingo thought to be uplift former sea-floor pockmark response marked isostatic recovery coastline following local ice sheet loss over last 10000 years. We find that locally significant emissions (less so) atmosphere result < 1 L s-1 occurs all year. Hydrological meteorological...

Glacier surges are periods of significantly increased ice flow due to ice-dynamic feedbacks, in contrast more conventional advances or other responses changes mass balance. In the Arctic, a ring surging glacier clusters can be found extending from Alaska-Yukon Novaya Zemlya. The &amp;#8216;Arctic ring&amp;#8217; encapsulates Svalbard, an archipelago with long history glaciological observations and consequently measurements surges. However, estimates number surge-type glaciers across range...

Abstract. The monitoring of glaciers in Switzerland has a long tradition, yet glacier changes during the 20th century are only known through sparse observations. Here, we estimate halving Swiss volumes between 1931 and 2016 by mapping historical elevation at high resolution. Our analysis relies on terrestrial image archive as TerrA, which covers about 86 % glacierised area with 21 703 images acquired period 1916–1947 (with median date 1931). We developed semi-automated workflow to generate...

The distal deposition of tephra from explosive volcanism has the potential to geochronologically constrain sedimentary archives and landforms. With this technique, we a Late Glacial glacier re-advance on Svalbard suggest that glacioisostatic emergence rates during Younger Dryas chronozone were at least three times greater than previous estimates. identification cryptotephra (i.e., non-visible) horizons, outside extent visible fallout, greatly expanded field application tephrochronology....

Abstract Extensive regions in the permafrost zone are projected to become climatically unsuitable sustain peatlands over next century, suggesting transformations these landscapes that can leave large amounts of carbon vulnerable post‐thaw decomposition. We present 3 years eddy covariance measurements CH 4 and CO 2 fluxes from degrading peatland Iškoras Northern Norway, which we disaggregate into separate palsa, pond, fen areas using information provided by dynamic flux footprint a novel...

Formulae display:?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax order to improve their display. Uncheck the box turn off. This feature requires Javascript. Click on a formula zoom.

Abstract Photogrammetric reconstructions of the Aldegondabreen glacier on Svalbard from 17 archival terrestrial oblique photographs taken in 1910 and 1911 reveal a past volume 1373.7 ± 78.2 · 10 6 m 3 ; almost five times greater than its 2016. Comparisons to elevation data obtained aerial satellite imagery indicate relatively unchanging loss rate − 10.1 1.6 −1 over entire study period, while change is increasing. At this loss, may be non-existent within 30 years. If changes are regionally...

Abstract Using global Sentinel-1 radar backscatter data, we systematically map the locations of glaciers with surge-type activity during 2017–22. Patterns pronounced increases or decreases in strongest between two winter seasons often indicate large changes glacier crevassing, which treat here as a sign activity. Validations against velocity time series, terminus advances and crevassing found optical satellite images confirm robustness this approach. We find 115 events globally 2017 2022,...

ABSTRACT In Arctic alpine regions, glacio‐lacustrine environments respond sensitively to variations in climate conditions, impacting, for example,glacier extent and rendering former ice‐contact lakes into ice distal vice versa. Lakefloors may hold morphological records of past glacier extent, but remoteness long periods cover on such make acquisition high‐resolution bathymetric datasets challenging. Lake Tarfala Kebnepakte Glacier, located the Kebnekaise mountains, northern Sweden, comprise...

Abstract. Debris flows threaten communities in mountain regions worldwide. Combining modern photogrammetric processing with autonomous unoccupied aerial vehicle (UAV) flights at sub-weekly intervals allows mapping of sediment dynamics a debris flow catchment. This provides important information for disposition that pre-conditions the catchment occurrence. At Illgraben Switzerland, our UAV launched nearly 50 times snow-free periods 2019–2021 typical flight 2–4 d, producing 350–400 images...

Extensive regions in the permafrost zone are projected to become climatically unsuitable sustain peatlands over next century, suggesting transformations these landscapes that can leave large amounts of carbon vulnerable post-thaw decomposition. We present three years eddy covariance measurements CH4 and CO2 fluxes from degrading peatland Iskoras Northern Norway, which we disaggregate into separate palsa, pond, fen areas using information provided by dynamic flux footprint a novel...

Abstract. Debris flows threaten communities in mountain regions worldwide. Combining modern photogrammetric processing with autonomous unmanned aerial vehicle (UAV) flights at sub-weekly intervals allows mapping of sediment dynamics a debris flow catchment. This provides important information for disposition that pre-conditions the catchment occurrence. At Illgraben debris-flow Switzerland, our UAV launched nearly 50 times snow-free periods 2019–2021 typical flight 2–4 days, producing...

&amp;#160; Stronger and more widespread surface melt may alter the flow of glaciers ice sheets trigger instability. However, observational deficiencies hamper our ability to better understand thus predict such responses. We deployed borehole seismometers along centerline a High Arctic glacier in Svalbard. The records span over six years are analyzed relation measured increase velocity. complement seismic analysis (icequakes noise) with long-term measurements glacier-surface velocity,...

After surveying the subcatchment in Endalen valley by drone, we process survey photogrammetrical suite Agisoft Metashape version 1.8.4 using default processing settings.We register data to 2009 Digital Elevation Model (DEM) made well-georeferenced aerial images Norwegian Polar Institute (Norwegian Institute, 2014), Iterative Closest Point (ICP) registration CloudCompare 2.12, leading a mean vertical bias of 0.03 m, and absolute point-to-point distance (which consider uncertainty) 0.74 m.We...

Abstract. Permafrost carbon, stored in frozen organic matter across vast Arctic and sub-Arctic regions, represents a substantial increasingly vulnerable carbon reservoir. As global temperatures rise, the accelerated thawing of permafrost releases greenhouse gases, exacerbating climate change. However, freshly thawed may also experience lateral transport by groundwater flow to surface water recipients such as rivers lakes, increasing terrestrial-to-aquatic transfer carbon. The mobilization...

We present a practically simple methodology for tracking glacier surge onset and evolution using interferometric Synthetic Aperture Radar (InSAR) coherence. Detecting surges early monitoring their build-up is interesting multitude of scientific safety-related aspects. show that InSAR coherence maps allow the detection surge-related instability on Svalbard many years before being detectable by, instance, feature or crevasse detection. Furthermore, we derived data two types surges; downstream-...

Most small land-terminating glaciers in Svalbard have experienced large recession since the Little Ice Age (LIA) and today are thin, cold, largely inactive. This likely contrasts to their LIA conditions, but observational record from that time is sparse. We investigate evolution of five central Nordenskiöld Land, Svalbard, 2019. Photogrammetric reconstructions ground penetrating radar used reconstruct geometric changes 1936, historical observation, photographs, geomorphological mapping...

Permafrost and glaciers in the high Arctic form an impermeable &amp;#8216;cryospheric cap&amp;#8217; that traps a large reservoir of sub-surface methane hinders it from reaching atmosphere. The vulnerability cryosphere to climate warming is making releases this possible, but uncertainty magnitude timing makes future predictions greenhouse gas emissions difficult. In Svalbard, where air temperatures are rising more than twice as fast average for Arctic, retreating leaving behind exposed...

Abstract. The monitoring of glaciers in Switzerland has a long tradition, yet glacier changes during the 20th century are only known through sparse observations. Here, we estimate halving Swiss volumes between 1931 and 2016 by mapping historical elevation at high resolution. Our analysis relies on terrestrial image archive as TerrA, which covers about 86 % glacierised area with 21,703 images acquired period 1916–1947 (1931 average). We developed semi-automated workflow to generate digital...