Results 81 to 90 of about 314,168 (203)
Gravitational Separation in Polar Firn [PDF]
Science, 1993 Craig, H. +7 more
openaire +3 more sources
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 13, 16 July 2026.Abstract Photosynthetic eukaryotic algae survived the Neoproterozoic Snowball Earth events, indicating that liquid‐water refugia existed somewhere on the surface. We examine the potential for refugia at the coldest time of a snowball event, before CO2 had risen and with high‐albedo ice on the frozen ocean, before it became darkened by dust deposition ...
Greta E. M. Shum +5 more
wiley +1 more source
A Vast Valley Network Beneath the Greenland Ice Sheet
Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.Abstract Mapping subglacial topography along the margin of the Greenland Ice Sheet was revolutionized by reconciling measurements of ice thickness and surface velocity using the principle of mass conservation. Despite evidence that many subglacial valleys resolved by that method extend upstream, it cannot be applied to the ice sheet's slower‐flowing ...
Allison M. Chartrand +6 more
wiley +1 more source
The Chief Editor welcomes you to a free, green Polar Research
, 2010 Polar Research is now an open-access journal, freely available to anyone with a computer and connection to the internet. Now readers around the world will have free access to the latest scientific articles on climate, biodiversity, polar history and ...
Goldman, Helle
core +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. +4 more
openaire +2 more sources
Journal of Geophysical Research: Earth Surface, Volume 131, Issue 7, July 2026.Abstract Understanding the basal conditions of East Antarctica's outlet glaciers is critical for accurately modeling future ice‐sheet evolution. Denman Glacier, one of the continent's fastest‐flowing glaciers, has been identified in bed‐topography models as occupying the deepest continental trough on Earth, potentially acting as a major outlet of the ...
Maria Constanza Manassero +8 more
wiley +1 more source
, 2022 Sea-ice distribution and duration are declining across the circumpolar range of the polar bear (Ursus maritimus), resulting in a reduced access to ice-obligate seals, its primary prey.
Di Corrado, Christopher +4 more
core +1 more source
Journal of Neurochemistry, Volume 170, Issue 7, July 2026.Alzheimer's disease is driven by interconnected pathological processes, including amyloid‐β aggregation, tau hyperphosphorylation, neuroinflammation, oxidative stress, synaptic dysfunction, and mitochondrial impairment. While recently approved anti‐amyloid therapies represent an important advance, their modest clinical benefits highlight the ...
Emre Aktaş +3 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.Abstract Southern Hemisphere westerly winds are important drivers of Antarctic and sub‐Antarctic environmental change. Short observational wind records prevent us from fully understanding the scope of their variability. Proxy records provide valuable tools to extend environmental records. Here we present a novel wind study based on the use of windblown
Dieter R. Tetzner +4 more
wiley +1 more source
Comments to a polar bear population model
, 1985 Larsen, T. & Ugland, K. I. (Polar Research 2 n.s., 117-118) note correctly that a Leslie matrix model treats cubs and females as independent units which is not the case for polar bears.
Øritsland, Nils Are
core +1 more source