Niklas Neckel
YOU?
Author Swipe
View article: Iceberg influence on snow distribution and slush formation on Antarctic landfast sea ice from airborne multi-sensor observations
Iceberg influence on snow distribution and slush formation on Antarctic landfast sea ice from airborne multi-sensor observations Open
Landfast sea ice fringes much of the coast of Antarctica and plays an important role for coastal ice–ocean–atmosphere interaction and ice shelf stability, as well as for the sea ice associated ecosystem. It is often characterized by embedd…
View article: Monitoring shear-zone weakening in East Antarctic outlet glaciers through differential InSAR measurements
Monitoring shear-zone weakening in East Antarctic outlet glaciers through differential InSAR measurements Open
The stability of the Antarctic Ice Sheet depends on ice flux into the ocean through major outlet glaciers, which is resisted by shear stresses in the lateral shear margins, both on grounded ice and on floating ice shelves. Within the tidal…
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: Iceberg influence on snow distribution and slush formation on Antarctic landfast sea ice from airborne multi-sensor observations
Iceberg influence on snow distribution and slush formation on Antarctic landfast sea ice from airborne multi-sensor observations Open
Antarctic landfast sea ice fringes much of the coast of Antarctica and plays an important role for coastal ice-ocean-atmosphere interaction and ice shelf stability, as well as for the sea ice associated ecosystem. It is often characterized…
View article: Predicting Melt Pond Coverage on Arctic Sea Ice From Pre‐Melt Surface Topography
Predicting Melt Pond Coverage on Arctic Sea Ice From Pre‐Melt Surface Topography Open
Sea‐ice melt ponds form in the depressions of pre‐melt surface topography, a process widely accepted yet lacking larger‐scale evaluation through explicit comparisons. During MOSAiC, we collected multi‐dimensional aerial data to examine the…
View article: Characterizing sea ice melt pond fraction and geometry in relation to surface morphology
Characterizing sea ice melt pond fraction and geometry in relation to surface morphology Open
Melt ponds play a crucial role in modulating the energy balance of Arctic sea ice by reducing surface albedo. While Arctic sea ice is becoming younger and smoother, this raises questions about how these changes affect melt pond characteris…
View article: Linking observations of Arctic summer sea ice thickness and melt ponds to model simulations
Linking observations of Arctic summer sea ice thickness and melt ponds to model simulations Open
Melt ponds on Arctic sea ice play a critical role in the ice-albedo feedback, influencing the Arctic energy budget and climate. While satellite-derived products provide broad-scale estimates of melt pond fraction, detailed information on i…
View article: Spatial variability in surface brightness and solar energy deposition of Arctic sea ice
Spatial variability in surface brightness and solar energy deposition of Arctic sea ice Open
Sea ice modulates the transfer of shortwave radiative energy fluxes within the Arctic atmosphere-sea-ice-ocean system. Understanding and predicting these fluxes comes with greatest uncertainties during the melt and freeze-up seasons, when …
View article: Monitoring Shear-Zone Weakening in East Antarctic Outlet Glaciers through Differential InSAR Measurements
Monitoring Shear-Zone Weakening in East Antarctic Outlet Glaciers through Differential InSAR Measurements Open
The stability of the Antarctic Ice Sheet depends on ice flux into the ocean through major outlet glaciers, which is resisted by shear stresses in the lateral shear margins both on grounded ice and on floating ice shelves. Within the tidal …
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: 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: Folded ice in the upper North East Greenland Ice Stream reveal timing of the onset of streaming
Folded ice in the upper North East Greenland Ice Stream reveal timing of the onset of streaming Open
Only a few localised ice streams drain most ice from the Greenland Ice Sheet. Thus, understanding ice stream behaviour and their temporal variability is crucially important to predict future sea-level change. The interior trunk of the 700 …
View article: Arctic Meltponds: Automated Detection Algorithm Using Enhanced Machine Learning
Arctic Meltponds: Automated Detection Algorithm Using Enhanced Machine Learning Open
Melt ponds are pools of water that form during summer on the surface of the arctic ice. Due to the lower albedo, melt ponds absorb more solar radiation than surrounding ice and hence have higher temperature. This causes more water to melt,…
View article: Supraglacial lake drainage through gullies and fractures
Supraglacial lake drainage through gullies and fractures Open
The mechanisms of drainage of supraglacial lakes are not yet fully understood. Here we present an indepth study of drainage characteristics of a 21km^2 large supraglacial lake in Northeast Greenland from its genesis in mid 1990s to 2023. W…
View article: Monitoring Shear-Zone Weakening in East Antarctic Outlet Glaciers through Differential InSAR Measurements
Monitoring Shear-Zone Weakening in East Antarctic Outlet Glaciers through Differential InSAR Measurements Open
The stability of polar ice sheets is governed by the seaward movement of ice streams which is decelerated by resistance originating from lateral shear zones. We explore the impact of crystal-scale anisotropy on effective ice stiffness, wit…
View article: Surface albedo measurements and surface type classification from helicopter-based observations during MOSAiC
Surface albedo measurements and surface type classification from helicopter-based observations during MOSAiC Open
Global climate change poses significant societal and political challenges. The rapid increase in the near-surface air temperatures and the drastic retreat of the Arctic sea ice during summer are not well represented by climate models. The …
View article: Comment on egusphere-2023-1320
Comment on egusphere-2023-1320 Open
Abstract. The 79° North Glacier (Nioghalvfjerdsbrae, 79NG) is one of three remaining glaciers with a floating tongue in Greenland. Although the glacier was considered exceptionally stable in the past, earlier studies indicate that the ice …
View article: The Subglacial Lake That Wasn't There: Improved Interpretation From Seismic Data Reveals a Sediment Bedform at Isunnguata Sermia
The Subglacial Lake That Wasn't There: Improved Interpretation From Seismic Data Reveals a Sediment Bedform at Isunnguata Sermia Open
Radio Echo Sounding (RES) surveys conducted in May 2010 and April 2011 revealed a 2 km 2 flat area with increased bed reflectivity at the base of Isunnguata Sermia at the western margin of the Greenland Ice Sheet. This flat reflector was l…
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 was considered exceptionally stable in the past, earlier studies indicate that the ice tongue has…
View article: Precursor of disintegration of Greenland's largest floating ice tongue
Precursor of disintegration of Greenland's largest floating ice tongue Open
The largest floating tongue of Greenland’s ice sheet, Nioghalvfjerdsbræ, has been relatively stable with respect to areal retreat until 2022. Draining more than 6 % of the ice sheet, a disintegration of Nioghalvfjerdsbræ's floating tongue …
View article: Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition Open
Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic first-year sea-ice ridge, fr…
View article: Sea Ice Melt Pond Fraction Derived From Sentinel‐2 Data: Along the MOSAiC Drift and Arctic‐Wide
Sea Ice Melt Pond Fraction Derived From Sentinel‐2 Data: Along the MOSAiC Drift and Arctic‐Wide Open
Melt ponds forming on Arctic sea ice in summer significantly reduce the surface albedo and impact the heat and mass balance of the sea ice. Therefore, their areal coverage, which can undergo rapid change, is crucial to monitor. We present …
View article: Precursor of disintegration of Greenland's largest floating ice tongue
Precursor of disintegration of Greenland's largest floating ice tongue Open
The largest floating tongue of Greenland’s ice sheet, Nioghalvfjerdsbrae, has so far been relatively stable with respect to areal retreat. Curiously, it experienced significant less thinning and ice flow acceleration than its neighbo…
View article: Seasonal enhanced melting under Ekström Ice Shelf, Antarctica
Seasonal enhanced melting under Ekström Ice Shelf, Antarctica Open
Ice–ocean interaction is crucial for the integrity of ice shelves and thus ice sheet stability. Warm ocean currents lead to enhanced basal melting of ice shelves, which is the dominant component of mass loss for the Antarctic Ice She…
View article: Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition Open
Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic first-year sea-ice ridge, fr…
View article: Melt Pond Fraction Derived from Sentinel-2 Data: Along the MOSAiC Drift and Arctic-wide
Melt Pond Fraction Derived from Sentinel-2 Data: Along the MOSAiC Drift and Arctic-wide Open
Melt ponds forming on Arctic sea ice in summer significantly reduce the surface albedo and impact the heat and mass balance of the sea ice. Their seasonal development features fast and local changes in fractions of surface types demonstrat…
View article: Comment on tc-2022-171
Comment on tc-2022-171 Open
Abstract. The largest floating tongue of Greenland’s ice sheet, Nioghalvfjerdsbræ, has so far been relatively stable with respect to areal retreat. Curiously, it experienced significant less thinning and ice flow acceleration than its neig…
View article: On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling
On the evolution of an ice shelf melt channel at the base of Filchner Ice Shelf, from observations and viscoelastic modeling Open
Ice shelves play a key role in the stability of the Antarctic Ice Sheet due to their buttressing effect. A loss of buttressing as a result of increased basal melting or ice shelf disintegration will lead to increased ice discharge. Some ic…