Results 71 to 80 of about 795 (198)

Formation and development of supraglacial lakes in the percolation zone of the Greenland ice sheet

Journal of Glaciology, 2017
We examine repeat surface altimetry and radio echo observations of two supraglacial lakes in the percolation zone of the Greenland ice sheet to investigate the changes in firn conditions leading to lake formation and implications for meltwater storage ...
CHRISTINE CHEN, IAN M. HOWAT, SANTIAGO DE LA PEÑA   +2 more
doaj   +1 more source

Velocity estimation in GPR data based on diffraction analysis: Methodology and application to Antarctic firn

Near Surface Geophysics, Volume 24, Issue 2, Page 170-186, April 2026.
Abstract This study presents a methodological framework for estimating electromagnetic wave velocities in ground‐penetrating radar (GPR) data based exclusively on the analysis of diffractions. The approach integrates diffraction separation using the plane wave destruction algorithm and subsequent velocity refinement through the residual diffraction ...
Ian E. Vogado, José Jadsom S. Figueiredo, Jandyr M. Travassos, Saulo S. Martins   +3 more
wiley   +1 more source

Anisotropic Melt Inclusions as a Confounding Signal for Ice‐Penetrating Radar Observations

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Ice‐penetrating radar is a powerful geophysical tool for understanding the subsurfaces of Earth, Mars, and icy moons. Radar reflectivity, attenuation, and birefringence are used to infer subsurface hydrology, englacial temperature, water content, and crystal orientation fabric.
A. H. Cheng, D. M. Schroeder, N. S. Wolfenbarger, R. Shaper, C. Seltzer, B. Hills   +5 more
wiley   +1 more source

Rainfall and Rain‐on‐Snow Events Over Greenland in Summer: Climatology, Trends, Synoptics

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract Rain‐on‐snow (ROS) events in the Arctic can lead to major impacts on the snow cover, cryosphere and environment. During the last decades, these events have significantly increased, mostly due to climate change. Here, we use outputs from the regional climate model MAR (version 3.14) driven by the ERA5 reanalysis at 10‐km resolution over ...
Emilie Frame, Benjamin Pohl, Charles Amory, Xavier Fettweis, Victoire Buffet, Eric Bernard, Olivier Champagne, Vincent Favier   +7 more
wiley   +1 more source

Diffusion of stable isotopes in polar firn and ice: the isotope effect in firn diffusion

, 2000
Ice core records are often affected by post-depositional processes that need to be better understood to prevent wrong interpretation of the data. Records of stable isotopes are affected by diffusion both in the firn and in the deeper ice. We present a quantitative theory for diffusion in firn that applies the measured tortuosity factors for O₂ and CO₂ ...
Johnsen, Sigfús J., Clausen, Henrik B., Cuffey, Kurt M., Hoffmann, Georg, Creyts, Timothy T.   +4 more
openaire   +2 more sources

Rapid Seismic and Infrasound Assessment of Large Landslides: A Case Study From Denali National Park and Preserve (Alaska)

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 3, March 2026.
Abstract Large, rapid landslides are a global hazard that can occur in remote, mountainous areas. Eyewitness reports of landslides and satellite imagery can often be limited or delayed, particularly during inclement weather. However, landslide‐generated seismic and infrasound (low‐frequency atmospheric sound) waves can be remotely detected in near real‐
Liam Toney, Michael E. West, Ezgi Karasözen, Denny Capps, Elaine Collins, Kate E. Allstadt, Jana Pursley, Heather McFarlin, Anne Mangeney, David Fee, Dennis Staley, Matthew M. Haney, John J. Lyons, John Bellini   +13 more
wiley   +1 more source

Variation in herbivore defense strategies among plant species differing in elevational distribution and the role of temperature in defense

New Phytologist, Volume 249, Issue 6, Page 3091-3103, March 2026.
Summary Temperature influences the distribution and performance of both plants and insect herbivores. Consequently, plant–herbivore interactions are likely to vary across thermal gradients, which could affect the evolution of plant defense. Furthermore, temperature fluctuations may elicit immediate changes in defense.
Thomas Dorey, Janisse Deluigi, Alessio Maccagni, Sergio Rasmann, Gaétan Glauser, Yvonne Willi   +5 more
wiley   +1 more source

When Metabolomics Meets Quantitative Genetics: An Integrative Strategy to Elucidate Plant Resistance Mechanisms

Plant, Cell &Environment, Volume 49, Issue 3, Page 1712-1727, March 2026.
ABSTRACT Gene pyramiding in crop varieties offers a promising strategy to achieve sustainable production and reduce reliance on pesticides. However, stacking resistance genes without understanding their biological functions may result in transient protection.
Romane Lapous, Komla Exonam Amegan, Bernard Caromel, Charles‐Eric Durel, Anne‐Violette Lavoir, Julie Ferreira de Carvalho, Romain Larbat   +6 more
wiley   +1 more source

Firn Model Intercomparison Experiment (FirnMICE)

Journal of Glaciology, 2017
Evolution of cold dry snow and firn plays important roles in glaciology; however, the physical formulation of a densification law is still an active research topic.
JESSICA M.D. LUNDIN, C. MAX STEVENS, ROBERT ARTHERN, CHRISTO BUIZERT, ANAIS ORSI, STEFAN R.M. LIGTENBERG, SEBASTIAN B. SIMONSEN, EVAN CUMMINGS, RICHARD ESSERY, WILL LEAHY, PAUL HARRIS, MICHIEL M. HELSEN, EDWIN D. WADDINGTON   +12 more
doaj   +1 more source

Why Firn Quakes

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Snow dampens sounds, but anecdotal reports concisely describe audible propagating collapse events—firnquakes—in Antarctic and Arctic snowfields. We propose combining granular and continuum mechanics to form a testable theory for conditioning, triggering, and propagation of firnquakes consistent with scarce data.
A. Voigtländer, B. Gee
wiley   +1 more source