منابع مشابه
Ground Layer Adaptive Optics Performance in Antarctica
Ground layer Adaptive Optics (GLAO) is a new variant of adaptive optics that aims at correcting the seeing over a wide field of view by conjugating the deformable mirror to the boundary layer altitude.The South Pole is expected to be particularly to GLAO due to the absence of high altitude jets and the confinement of 96% of the seeing within a 220 m boundary layer. We present here the compariso...
متن کاملFormation of patterned ground and sublimation till over Miocene glacier ice in Beacon Valley, southern Victoria Land, Antarctica
A thin glacial diamicton, informally termed Granite drift, occupies the floor of central Beacon Valley in southern Victoria Land, Antarctica. This drift is ,1.0 m thick and rests with sharp planar contacts on stagnant glacier ice reportedly of Miocene age, older than 8.1 Ma. The age of the ice is based on 40Ar/39Ar analyses of presumed in situ ash-fall deposits that occur within Granite drift. ...
متن کاملDistribution and origin of patterned ground on Mullins Valley debris-covered glacier, Antarctica: the roles of ice flow and sublimation
We map polygonally patterned ground formed in sublimation tills that overlie debris-covered glaciers in Mullins Valley and central Beacon Valley, in southern Victoria Land, Antarctica, and distinguish five morphological zones. Where the Mullins Valley debris-covered glacier debouches into Beacon Valley, polygonal patterning transitions from radial (orthogonal) intersections to non-oriented (hex...
متن کاملFormation and Organization of Patterned Ground in the Kharkhiraa Uul
INTRODUCTION Both sorted stone-bordered polygons and nonsorted stone circles were found on a gently sloping, 3000-m-high tableland adjacent to a glaciated valley in the Kharkhiraa Mountains. Neither the formation process nor the physical relationship between the two observed types of patterned ground is clearly understood (Kessler and Werner, 2003). Here I attempt to relate field observations t...
متن کاملSpatial relationships between patterned ground and ground ice detected by the Neutron Spectrometer on Mars
[1] Patterned grounds, like polygonal features, are the signature of climatic effects in periglacial regions on Earth. Identifying similar features on Mars is important for an understanding of the past Martian climate. In this study we mapped fresh patterned landforms from the systematic analysis of Mars Orbiter Camera high-resolution images. We show that most of them are distributed at latitud...
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ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 1961
ISSN: 0022-1430,1727-5652
DOI: 10.1017/s0022143000017615