Antarctic Topographic Realizations and Geostatistical Modeling Used to Map Subglacial Lakes
نویسندگان
چکیده
منابع مشابه
Recent advances in understanding Antarctic subglacial lakes and hydrology
It is now well documented that over 400 subglacial lakes exist across the bed of the Antarctic Ice Sheet. They comprise a variety of sizes and volumes (from the approx. 250 km long Lake Vostok to bodies of water less than 1 km in length), relate to a number of discrete topographic settings (from those contained within valleys to lakes that reside in broad flat terrain) and exhibit a range of dy...
متن کاملThe hydrochemistry of Lake Vostok and the potential for life in Antarctic subglacial lakes
Our understanding of Lake Vostok, the huge subglacial lake beneath the East Antarctic Ice Sheet, has improved recently through the identification of key physical and chemical interactions between the ice sheet and the lake. The north of the lake, where the overlying ice sheet is thickest, is characterized by subglacial melting, whereas freezing of lake water occurs in the south, resulting in 3⁄...
متن کاملBedgap: where next for Antarctic subglacial mapping?
The recently published Bedmap2 datasets mark the culmination of several decades of subice and subocean Antarctic topographic surveying by many nations, but maps of the topographic data distribution show that in the global context, the Antarctic bed remains very poorly sampled. Most of the remaining large unmapped areas on Earth lie under Antarctic ice and polar surveying continues to be difficu...
متن کاملGlaciological twins: basally controlled subglacial and supraglacial lakes
Subglacial lakes beneath ice streams of Antarctica and supraglacial lakes observed on the flanks of the Greenland ice sheet may seem to be unrelated. The former derive their water from energy dissipation associated with basal friction, the latter from atmospherically driven surface melting. However, using numerical models of ice and water flow, it is shown here that they share a common relation...
متن کاملEnglacial phase changes and intergranular flow above subglacial lakes
Glaciers are permeated by liquid veins that line the triple junctions between ice grains and act as conduits for material transport. The density difference between water and ice produces a hydraulic gradient that drives liquid flow down towards the glacier bed. We investigate how variations in this transport rate are manifest in the lower regions of a glacier that floats on a subglacial reservo...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Earth Surface
سال: 2020
ISSN: 2169-9003,2169-9011
DOI: 10.1029/2019jf005420