Results 61 to 70 of about 795 (198)

A synthetic study of acoustic full waveform inversion to improve seismic modelling of firn

Annals of Glaciology, 2022
The density structure of firn has implications for hydrological and climate modelling and for ice shelf stability. The firn structure can be evaluated from depth models of seismic velocity, widely obtained with Herglotz-Wiechert inversion (HWI), an ...
Emma Pearce, Adam D. Booth, Sebastian Rost, Paul Sava, Tuğrul Konuk, Alex Brisbourne, Bryn Hubbard, Ian Jones   +7 more
doaj   +1 more source

Aspect Asymmetry in Martian Gullies: A Topographic Signature of Their Formation Process?

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract On Mars, erosional‐depositional landforms named gullies provide natural experiments for studying the topographic signature of the processes that act on hillslope evolution. High‐resolution topographic data were used to quantitatively compare the steepness of opposing walls in gully alcoves incised into ice‐rich slopeside mantling deposits.
A. Noblet, G. R. Osinski, S. J. Conway
wiley   +1 more source

Climatic and insolation control on the high-resolution total air content in the NGRIP ice core [PDF]

Climate of the Past, 2016
Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC
O. Eicher, M. Baumgartner, A. Schilt, J. Schmitt, J. Schwander, T. F. Stocker, H. Fischer   +6 more
doaj   +1 more source

Hot water drilling in the firn layer of Greenland's percolation zone

Annals of Glaciology, 2021
The intermixed thermal and structural framework of cold firn, water-saturated firn and ice layers in Greenland's percolation zone can be challenging to penetrate with core drills.
Neil Humphrey, Joel Harper, Toby Meierbachtol   +2 more
doaj   +1 more source

Fabric, Texture, and Bubble Characteristics of the Million‐Year Old Allan Hills Blue Ice Core ALHIC1901

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract Ice cores from the Allan Hills blue ice area in Antarctica have been dated to several million years of age. However, the stratigraphy of these cores is often disturbed, and age reversals are common, hampering the interpretation of the derived climate records.
Nicolas Stoll, Marguerite Shaya, Liam Kirkpatrick, Johannes Freitag, Valens Hishamunda, John‐Morgan Manos, Daniela Jansen, Ilka Weikusat, John Fegyveresi, Bradley Paul Lipovsky, Ed Brook, Sarah Shackleton, John Higgins, T. J. Fudge   +13 more
wiley   +1 more source

Airborne Radar Reveals Area‐Wide Decadal Increase of Surface Mass Balance on the Plateau in Dronning Maud Land, East Antarctica

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Projections of Antarctica's sea‐level contribution depend on future changes in surface mass balance (SMB), yet it remains uncertain whether climate change has already impacted SMB on the East Antarctic Plateau, given diverging trends in prior studies.
Alexandra M. Zuhr, Steven Franke, Olaf Eisen, Daniel Steinhage, Veit Helm, Maria Hörhold, Johannes Freitag, Reinhard Drews   +7 more
wiley   +1 more source

Air reverse circulation at the hole bottom in ice-core drilling

Journal of Glaciology, 2019
Ice-core drilling to depths of 200–300 m is an important part of research studies concerned with paleoclimate reconstruction and anthropogenic climate change. However, conventional drilling methods face difficulties due to firn permeability.
ZHENGYI HU, PAVEL TALALAY, ZHICHUAN ZHENG, PINLU CAO, GUITAO SHI, YUANSHENG LI, XIAOPENG FAN, HONGMEI MA   +7 more
doaj   +1 more source

Bromine Enrichment Signal in Svalbard Shallow Cores Reflects Changes of Seasonal Sea Ice Variability

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Bromine enrichment Brenr $\left(\mathrm{B}{\mathrm{r}}_{\mathrm{e}\mathrm{n}\mathrm{r}}\right)$ has been widely used as a proxy for past sea ice reconstructions. In this study, three firn cores drilled on Holtedahlfonna (Svalbard) were analyzed for trace elements. Excluding a single year data, a positive correlation was observed between Brenr $
Enrico Biscaro, Federico Scoto, Catherine Larose, Elena Barbaro, Francois Burgay, David Cappelletti, Giuliano Dreossi, Jacopo Gabrieli, Elisabeth Isaksson, Jack Kohler, Barbara Stenni, Clara Turetta, Jean‐Charles Gallet, Andrea Spolaor   +13 more
wiley   +1 more source

On the Influence of Mineral Dust on Glacial Albedo at Nevado Huascarán (Cordillera Blanca, Peru)

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 7, 16 April 2026.
Abstract In addition to warming and hydrological changes, glacier retreat is influenced by mineral dust and other light absorbing impurities. However, very little is known about the presence of mineral dust in the tropical Andes, making it difficult to model the radiative impact of dust on glacial surfaces.
Austin M. Weber, Emilie Beaudon, M. Roxana Sierra‐Hernández, Mary Davis, Don Kenny, Tal Y. Shutkin, Lonnie G. Thompson   +6 more
wiley   +1 more source

Lattice-Boltzmann modeling of the air permeability of polar firn [PDF]

Journal of Geophysical Research: Earth Surface, 2010
Recent advances in three‐dimensional (3D) imaging of snow and firn combined with numerical modeling of flow through complex geometries have greatly improved the ability to predict permeability values based on microstructure. In this work, we combined 3D reconstructions of polar firn microstructure obtained from microcomputed tomography (μCT) and a 3D ...
Zoe Courville, Maria Hörhold, Mark Hopkins, Mary Albert   +3 more
openaire   +3 more sources