Zobrazeno 1 - 10
of 137
pro vyhledávání: '"Douglas R. Macayeal"'
Autor:
Niall B. Coffey, Douglas R. MacAyeal, Luke Copland, Derek R. Mueller, Olga V. Sergienko, Alison F. Banwell, Ching-Yao Lai
Publikováno v:
Journal of Glaciology, Vol 68, Pp 867-878 (2022)
The once-contiguous Ellesmere Ice Shelf, first reported in writing by European explorers in 1876, and now almost completely disintegrated, has rolling, wave-like surface topography, the origin of which we investigate using a viscous buckling instabil
Externí odkaz:
https://doaj.org/article/c77e5abc48944c5fb2a12d0fb376c2d0
Autor:
Douglas R. MacAyeal, Olga V. Sergienko, Alison F. Banwell, Grant J. Macdonald, Ian C. Willis, Laura A. Stevens
Publikováno v:
Journal of Glaciology, Vol 67, Pp 885-902 (2021)
We develop a two-dimensional, plan-view formulation of ice-shelf flow and viscoelastic ice-shelf flexure. This formulation combines, for the first time, the shallow-shelf approximation for horizontal ice-shelf flow (and shallow-stream approximation f
Externí odkaz:
https://doaj.org/article/f560b7c12bff44e4985f1dc2f7373dd1
Publikováno v:
Journal of Glaciology, Vol 66, Pp 231-247 (2020)
Diurnal depth cycles of decimeter scale are observed in a supraglacial lake on the McMurdo Ice Shelf, Antarctica. We evaluate two possible causes: (1) tidal tilt of the ice shelf in response to the underlying ocean tide, and (2) meltwater input varia
Externí odkaz:
https://doaj.org/article/3d30ba53d4174d379a77bc66888edb25
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 5, p 79 (2023)
In this paper, we present an open-source software (Simulator of Asteroid Malformation Under Stress, SAMUS ) that simulates constant-density, constant-viscosity liquid bodies subject to tidal forces for a range of assumed viscosities and sizes. This s
Externí odkaz:
https://doaj.org/article/cede029b037446f0a31bfebcb38d86b4
Autor:
Douglas R. MacAyeal
Publikováno v:
Annals of Glaciology, Vol 60, Pp 21-29 (2019)
Johannes Weertman published his first glaciological paper in 1957 only 5 years after getting his DSc in metallurgy from the Carnegie Institute of Technology. The paper presented the very first sliding law developed quantitatively from first principle
Externí odkaz:
https://doaj.org/article/21ed20a948a7406a8f09f8166f7d98db
Autor:
Douglas R. MacAyeal, Alison F. Banwell, Emile A. Okal, Jinqiao Lin, Ian C. Willis, Becky Goodsell, Grant J. MacDonald
Publikováno v:
Annals of Glaciology, Vol 60, Pp 137-157 (2019)
Seismograms acquired on the McMurdo Ice Shelf, Antarctica, during an Austral summer melt season (November 2016–January 2017) reveal a diurnal cycle of seismicity, consisting of hundreds of thousands of small ice quakes limited to a 6–12 hour peri
Externí odkaz:
https://doaj.org/article/031b29c1de6a467382f06c3f1c24c4f9
Publikováno v:
Journal of Glaciology, Vol 65, Pp 508-517 (2019)
Changes in glacier length and extent are indicators of contemporary and archives of past climate changes, but this common climate proxy presents a challenge for inferring a climate signal. Modeling studies suggest that length fluctuations can occur d
Externí odkaz:
https://doaj.org/article/f72022641dcc42739fed4a2ccadcbe48
Autor:
GRANT J. MACDONALD, ALISON F. BANWELL, IAN C. WILLIS, DAVID P. MAYER, BECKY GOODSELL, DOUGLAS R. MacAYEAL
Publikováno v:
Journal of Glaciology, Vol 65, Pp 337-343 (2019)
Surface debris covers much of the western portion of the McMurdo Ice Shelf and has a strong influence on the local surface albedo and energy balance. Differential ablation between debris-covered and debris-free areas creates an unusual heterogeneous
Externí odkaz:
https://doaj.org/article/422ac0aaf57d4eb5ad4be4c49eddac59
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-10 (2019)
Meltwater ponding on top of ice shelves is thought to play a role in ice-shelf flexure and fracture, however in-situ evidence of these mechanisms is lacking. Here, the authors provide field-based evidence showing the impact of the filling and drainin
Externí odkaz:
https://doaj.org/article/573f9ae3e0f74643a958fbd9834c75d4
Publikováno v:
Annals of Glaciology, Vol 59, Pp 56-65 (2018)
Supraglacial lakes are known to trigger Antarctic ice-shelf instability and break-up. However, to date, no study has focused on lakes on Greenland's floating termini. Here, we apply lake boundary/area and depth algorithms to Landsat 8 imagery to anal
Externí odkaz:
https://doaj.org/article/e94adc89fe1d4faaad7226e2cb6f3a75