Zobrazeno 1 - 10
of 37
pro vyhledávání: '"IAN C. WILLIS"'
Supervised classification of slush and ponded water on Antarctic ice shelves using Landsat 8 imagery
Autor:
Rebecca L. Dell, Alison F. Banwell, Ian C. Willis, Neil S. Arnold, Anna Ruth W. Halberstadt, Thomas R. Chudley, Hamish D. Pritchard
Publikováno v:
Journal of Glaciology, Vol 68, Pp 401-414 (2022)
Surface meltwater is becoming increasingly widespread on Antarctic ice shelves. It is stored within surface ponds and streams, or within firn pore spaces, which may saturate to form slush. Slush can reduce firn air content, increasing an ice-shelf's
Externí odkaz:
https://doaj.org/article/ca21aee3c148465f9e5c0e8f79fa1d35
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
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
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
Autor:
THOMAS R. CHUDLEY, IAN C. WILLIS
Publikováno v:
Journal of Glaciology, Vol 65, Pp 1-12 (2019)
The West Kunlun Shan lie close to, or are perhaps part of, two significant glaciological phenomena – the High Mountain Asia surge ‘supercluster’ and the Karakoram Anomaly. However, glaciological studies, and particularly surge studies, in the r
Externí odkaz:
https://doaj.org/article/8cc57aa7faaf401abe31add8346e3d57
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:
Atmospheric Science Letters, Vol 22, Iss 3, Pp n/a-n/a (2021)
Abstract Many of the glaciers in the Nepalese Himalaya are partially covered in a layer of loose rock known as debris cover. In the Dudh Koshi River Basin, Nepal, approximately 25% of glaciers are debris‐covered. Debris‐covered glaciers have been
Externí odkaz:
https://doaj.org/article/6d3ae4b85fe940a589abc6a756ff3ebc
Publikováno v:
Journal of Glaciology, Vol 64, Pp 208-226 (2018)
The controls on rapid surface lake drainage on the Greenland ice sheet (GrIS) remain uncertain, making it challenging to incorporate lake drainage into models of GrIS hydrology, and so to determine the ice-dynamic impact of meltwater reaching the ice
Externí odkaz:
https://doaj.org/article/5c706cf9672a47b3919a23be528d5d9e
Autor:
Alison F. Banwell, Ian C. Willis, Grant J. Macdonald, Becky Goodsell, David P. Mayer, Anthony Powell, Douglas R. Macayeal
Publikováno v:
Annals of Glaciology, Vol 58, Pp 78-87 (2017)
On 2 March 2016, several small en échelon tabular icebergs calved from the seaward front of the McMurdo Ice Shelf, and a previously inactive rift widened and propagated by ~3 km, ~25% of its previous length, setting the stage for the future calving
Externí odkaz:
https://doaj.org/article/504432a5c88943a8ac32d826d6bbcf9a