Zobrazeno 1 - 10
of 49
pro vyhledávání: '"ice crystal studies"'
Publikováno v:
Annals of Glaciology, Vol 64, Pp 63-66 (2023)
Deciphering the localisation of solid and dissolved impurities on the micron-scale in glacial ice remains a challenge, but is critical to understand the integrity of ice core records and internal deformation. Here we report on the state-of-the-art in
Externí odkaz:
https://doaj.org/article/b12660223c89451a992b36aa658c9ecd
Autor:
Marc Oggier, Hajo Eicken
Publikováno v:
Journal of Glaciology, Vol 68, Pp 833-848 (2022)
Sea-ice pore microstructure constrains ice transport properties, affecting fluid flow relevant to oil-in-ice transport and biogeochemical processes. Motivated by a lack of pore microstructural data, in particular for granular ice and across the seaso
Externí odkaz:
https://doaj.org/article/074bf2d4ab9d4bdbacb0b3e7d4b2d0cf
Publikováno v:
Journal of Glaciology, Vol 67, Pp 1205-1212 (2021)
The current paper studies the dynamics and age of the Triangle du Tacul (TDT) ice apron, a massive ice volume lying on a steep high-mountain rock wall in the French side of the Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long
Externí odkaz:
https://doaj.org/article/84dd7118721c49bd88a060480cf17209
Autor:
Maurine Montagnat, Mathieu Bourcier, Armelle Philip, Paul D. Bons, Catherine C. Bauer, Paul Deconinck, Pierre Hereil
Publikováno v:
Journal of Glaciology, Vol 67, Pp 1190-1204 (2021)
Hailstone structures have been studied for over a century, but so far mainly by manual optical means. This paper presents new texture and microstructure data (i.e. crystal lattice orientations, grain sizes and shapes) measured with an Automatic Ice T
Externí odkaz:
https://doaj.org/article/ca1ad65b91b64c14b6ca85f67130be2e
Autor:
Sönke Maus
Publikováno v:
Annals of Glaciology, Vol 61, Pp 408-425 (2020)
Columnar sea ice grows with an interface of tiny parallel ice plates, the distance of which is known as plate spacing. While it has been proposed as a fundamental microstructure scale of sea ice, the physics behind its formation has not been fully un
Externí odkaz:
https://doaj.org/article/dd5131b889aa4f19a25864d9fad05f04
Publikováno v:
Annals of Glaciology, Vol 61, Pp 74-83 (2020)
Here we use polarimetric measurements from an Autonomous phase-sensitive Radio-Echo Sounder (ApRES) to investigate ice fabric within Whillans Ice Stream, West Antarctica. The survey traverse is bounded at one end by the suture zone with the Mercer Ic
Externí odkaz:
https://doaj.org/article/a099c7635758466585bce37be0f0d791
Autor:
TOMOTAKA SARUYA, KOKI NAKAJIMA, MORIMASA TAKATA, TOMOYUKI HOMMA, NOBUHIKO AZUMA, KUMIKO GOTO-AZUMA
Publikováno v:
Journal of Glaciology, Vol 65, Pp 531-541 (2019)
We investigated the effects of microparticles and grain size on the microstructural evolutions and mechanical properties of polycrystalline ice. Uniaxial compression tests were conducted using fine-grained pure ice and silica-dispersed ice under vari
Externí odkaz:
https://doaj.org/article/f6d7f071bc9e420992bb3bd83f591d04
Autor:
John M. Fegyveresi, Richard B. Alley, Donald E. Voigt, Joan J. Fitzpatrick, Lawrence A. Wilen
Publikováno v:
Annals of Glaciology, Vol 60, Pp 8-19 (2019)
Measurements of a sample from ~580 m depth in the WAIS Divide (WDC06A) ice core reveal that bubbles are preferentially elongated in the basal plane of their parent grain, as expected if bubble shape preserves the record of dominant basal glide. This
Externí odkaz:
https://doaj.org/article/d186581ba64c4a58a38c9654a8380165
Autor:
CHRISTOPHER J.L. WILSON, NICHOLAS J. R. HUNTER, VLADIMIR LUZIN, MARK PETERNELL, SANDRA PIAZOLO
Publikováno v:
Journal of Glaciology, Vol 65, Pp 101-122 (2019)
This contribution discusses results obtained from 3-D neutron diffraction and 2-D fabric analyser in situ deformation experiments on laboratory-prepared polycrystalline deuterated ice and ice containing a second phase. The two-phase samples used in t
Externí odkaz:
https://doaj.org/article/19a34a989e0048958602d063aacc2c8c
Publikováno v:
Journal of Glaciology, Vol 64, Pp 771-780 (2018)
We have mapped the full crystallographic orientation of sea ice using electron backscatter diffraction (EBSD). This is the first time EBSD has been used to study sea ice. Platelet ice is a feature of sea ice near ice shelves. Ice crystals accumulate
Externí odkaz:
https://doaj.org/article/f21b92d62fdc42118a6a8c9190f3f6e7