Results 21 to 30 of about 347,440 (309)

Upstream flow effects revealed in the EastGRIP ice core using Monte Carlo inversion of a two-dimensional ice-flow model [PDF]

The Cryosphere, 2021
The Northeast Greenland Ice Stream (NEGIS) is the largest active ice stream on the Greenland Ice Sheet (GrIS) and a crucial contributor to the ice-sheet mass balance.
T. A. Gerber, C. S. Hvidberg, S. O. Rasmussen, S. Franke, G. Sinnl, A. Grinsted, D. Jansen, D. Dahl-Jensen, D. Dahl-Jensen   +8 more
doaj   +1 more source

Incorporation of particulates into accreted ice above subglacial Vostok lake, Antarctica [PDF]

, 2005
The nature of microscopic particulates in meteoric and accreted ice from the Vostok (Antarctica) ice core is assessed in conjunction with existing ice-core data to investigate the mechanism by which particulates are incorporated into refrozen lake water.
Priscu, JC, Royston-Bishop, G, Siegert, MJ, Tranter, M, Christner, BC, Lee, V, Christner, B., Priscu, J. C., Siegert, M. J., Royston-Bishop, G., Tranter, M., Lee, V.   +11 more
core   +1 more source

A glaciochemical study of the 120 m ice core from Mill Island, East Antarctica [PDF]

Climate of the Past, 2017
A 120 m ice core was drilled on Mill Island, East Antarctica (65°30′ S, 100°40′ E) during the 2009/2010 Australian Antarctic field season. Contiguous discrete 5 cm samples were measured for hydrogen peroxide, water stable isotopes, and trace ion ...
M. Inoue, M. A. J. Curran, A. D. Moy, T. D. van Ommen, A. D. Fraser, H. E. Phillips, I. D. Goodwin   +6 more
doaj   +1 more source

Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations

Journal of Glaciology, 2023
We present new data from the debris-rich basal ice layers of the NEEM ice core (NW Greenland). Using mineralogical observations, SEM imagery, geochemical data from silicates (meteoric 10Be, εNd, 87Sr/86Sr) and organic material (C/N, δ13C), we ...
Pierre-Henri Blard, Marie Protin, Jean-Louis Tison, François Fripiat, Dorthe Dahl-Jensen, Jørgen P. Steffensen, William C. Mahaney, Paul R. Bierman, Andrew J. Christ, Lee B. Corbett, Vinciane Debaille, Thomas Rigaudier, Philippe Claeys, ASTER Team   +13 more
doaj   +1 more source

Ices in Starless and Starforming Cores [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractIcy grain mantles are commonly observed through infrared spectroscopy toward dense clouds, cloud cores, protostellar envelopes and protoplanetary disks. Up to 80% of the available oxygen, carbon and nitrogen are found in such ices; the most common ice constituents – H2O, CO2 and CO – are second in abundance only to H2 in many star forming ...
Oberg, Karin I., Boogert, A. C. Adwin, Pontoppidan, Klaus M., Broek, Saskia van den, van Dishoeck, Ewine F., Bottinelli, Sandrine, Blake, Geoffrey A., Evans II, Neal J.   +7 more
openaire   +2 more sources

Burning-derived vanillic acid in an Arctic ice core from Tunu, northeastern Greenland [PDF]

Climate of the Past, 2018
In this study, vanillic acid was measured in the Tunu ice core from northeastern Greenland in samples covering the past 1700 years. Vanillic acid is an aerosol-borne aromatic methoxy acid, produced by the combustion of lignin during biomass burning ...
M. M. Grieman, M. Aydin, J. R. McConnell, E. S. Saltzman   +3 more
doaj   +1 more source

Diffusive equilibration of N₂, O₂ and CO₂ mixing ratios in a 1.5-million-years-old ice core [PDF]

The Cryosphere, 2014
In the framework of the International Partnerships in Ice Core Sciences, one of the most important targets is to retrieve an Antarctic ice core that extends over the last 1.5 million years (i.e.
B. Bereiter, H. Fischer, J. Schwander, T. F. Stocker   +3 more
doaj   +1 more source

A multi-millennial record of rock glacier ice chemistry (Lazaun, Italy)

Frontiers in Earth Science, 2023
Active rock glaciers—known as mixtures of unconsolidated debris with interstitial ice, ice lenses or a core of massive ice—are widespread indicators of mountain permafrost. The age of a frozen rock glacier core in the Central European Alps (Lazaun, Italy)
Ulrike Nickus, Hansjörg Thies, Karl Krainer, Kathrin Lang, Volkmar Mair, David Tonidandel   +5 more
doaj   +1 more source

Reconstructing ice-sheet accumulation rates at ridge B, East Antarctica [PDF]

, 2004
Understanding how ice sheets responded to past climate change is fundamental to forecasting how they will respond in the future. Numerical models calculating the evolution of ice sheets depend upon accumulation data, which are principally available from ...
Payne, Antony J, Leysinger Vieli, G.J.-M.C., Payne, A. J., Siegert, MJ, Payne, AJ, Leysinger Vieli, GJMC, Leysinger Vieli, Gwendolyn, Siegert, Martin J, Siegert, M. J.   +8 more
core   +1 more source

A novel laser melting sampler for discrete, sub-centimeter depth-resolved analyses of stable water isotopes in ice cores

Journal of Glaciology, 2023
We developed a novel laser melting sampler (LMS) for ice cores to measure the stable water isotope ratios (δ18O and δD) as temperature proxies at sub-centimeter depth resolutions.
Yuko Motizuki, Yoichi Nakai, Kazuya Takahashi, Junya Hirose, Yu Vin Sahoo, Masaki Yumoto, Masayuki Maruyama, Michio Sakashita, Kiwamu Kase, Satoshi Wada, Hideaki Motoyama, Yasushige Yano   +11 more
doaj   +1 more source