Results 301 to 310 of about 106,138 (355)

Hydration and dehydration of CM chondrites revealed by X‐ray diffraction combined with textural observations and compositional data

Meteoritics &Planetary Science, Volume 60, Issue 5, Page 1194-1215, May 2025.
Abstract The in‐plane rotation method is used to obtain X‐ray random diffraction (XRD) patterns of polished thin sections of 10 CM chondrites. The samples include five intermediately altered CM chondrites with subtypes 2.6–2.3, two heavily altered CM chondrites with subtype 2.0 and three with secondary heating after hydration (Y 980036, Y 980051, and ...
Naoya Imae, Makoto Kimura, Akira Yamaguchi   +2 more
wiley   +1 more source

Obliquity disruption and Antarctic ice sheet dynamics over a 2.4-Myr astronomical grand cycle. [PDF]

Sci Adv
Sullivan NB, Meyers SR, Levy RH, McKay RM, van de Flierdt T, Marschalek J, Perotti M, Zurli L, Talarico F, Harwood D, De Santis L, Florindo F, Naish TR, Grant GR, Patterson MO, Expedition 374 scientists.   +15 more
europepmc   +1 more source

Conspiracy Theories, Quantum Social Science, and the Political Power of Irrelevant Beliefs

Social Science Quarterly, Volume 106, Issue 3, May 2025.
ABSTRACT Objectives Recent psychological research into conspiracy theories (CTs) has explored the possible relationships between antecedents or predisposed mindsets as explanations of increased rates of CT belief and tested the increased susceptibility to cognitive fallacies among CT believers.
Michael P. A. Murphy
wiley   +1 more source

Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract The Bølling‐Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. This opal could either constitute a strengthened biological pump and thus carbon sequestration, or a weakened biological pump and release of marine‐sequestered CO2 to the atmosphere. We quantify silicic acid supply at
K. A. DeLong, T. Blackburn, B. Caissie, J. Addison, Z. Stroynowski, M. R. Sipala, F. Marcantonio, A. C. Ravelo   +7 more
wiley   +1 more source

Subglacial Precipitates Record Antarctic Ice Sheet Response to Southern Ocean Warming

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Subglacial calcite precipitation is thought to occur in East Antarctica during periods when warm Southern Ocean waters access the ice sheet margin. Here we present an expanded precipitate archive that includes a continent‐wide compilation of 38 new and previously reported calcite 234U‐230Th ages with isotopic compositional data. These data are
Jessica Gagliardi, Terrence Blackburn, Gavin Piccione, Slawek Tulaczyk, C. Brenhin Keller   +4 more
wiley   +1 more source

Grounding Line Remote Operated Vehicle (GROV) Survey of the Ice Shelf Cavity of Petermann Glacier, Greenland

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract The melting of glaciers by ocean waters along the ice sheet periphery is a major physical process driving glacier evolution in a changing climate. Using a fiber‐optic‐tethered Grounding line Remote Operated Vehicle, we explore the ice shelf cavity of Petermann Glacier, in Northwestern Greenland, with an interferometric multibeam sonar ...
E. Rignot, N. Chauche, R. Gadi, Shivani Ehrenfeucht, Enrico Ciraci   +4 more
wiley   +1 more source

Cyclic Effective Pressure Loading Impacts Glacial Slip Over Deformable Beds

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Tidal fluctuations at the grounding zones of marine‐terminating glaciers induce oscillations in effective pressure at the glacier bed, altering ice‐till coupling and glacial slip. Glaciers slipping atop deformable beds with oscillatory pressure fluctuations can generate a transient porewater pressure feedback within the underlying till ...
N. Morgan‐Witts, D. D. Hansen, L. K. Zoet, M. Haseloff   +3 more
wiley   +1 more source

From fossils to future - Jane Francis on polar exploration and changing climates. [PDF]

Biol Open
Pickup K.
europepmc   +1 more source

Beaufort Gyre Liquid Freshwater Content Change Under Greenhouse Warming From an Eddy‐Resolving Climate Simulation

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Future changes in the Beaufort Gyre liquid freshwater content (LFWC) are important for the local and global climate. However, traditional climate models cannot resolve oceanic and atmospheric eddies that are critical to the LFWC variations.
Xuan Shan, Michael Spall, Shantong Sun, Lixin Wu   +3 more
wiley   +1 more source

Segmented linear integral correlation Kernel ensemble reconstruction: A new method for climate reconstructions with applications to Holocene era proxies from an East Antarctic ice core. [PDF]

PLoS One
Roberts JL, Jong LM, McCormack FS, Kiem AS, Curran MAJ, Moy AD, Macha JMA, Plummer CT, French WJR, Ommen TDV.   +9 more
europepmc   +1 more source