Ice-sheet surface elevation change from crossover of ENVISAT data
نویسندگان
چکیده
منابع مشابه
Improving maps of ice-sheet surface elevation change using combined laser altimeter and stereoscopic elevation model data
We combine the complementary characteristics of laser altimeter data and stereoscopic digital elevation models (DEMs) to construct high-resolution ( 100m) maps of surface elevations and elevation changes over rapidly changing outlet glaciers in Greenland. Measurements from spaceborne and airborne laser altimeters have relatively low errors but are spatially limited to the ground tracks, while D...
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The dual-frequency altimeter of Topex allows since few years the observations of earth from 62°N to 62°S both in Ku and in C band. Previous works has been already performed above continental areas by [1, 2, 3, 4] and above the southern part of the Greenland ice sheet [5, 6]. These works show the great interest of a dual-frequency above both for the retrieval of some geophysical parameters and f...
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Observed changes in the surface elevation of the Greenland Ice Sheet are caused by ice dynamics, basal elevation change, basal melt, surface mass balance (SMB) variability, and by compaction of the overlying firn. The last two contributions are quantified here using a firn model that includes compaction, meltwater percolation, and refreezing. The model is forced with surface mass fluxes and tem...
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Surface strain rate is best observed by fitting a strain-rate ellipsoid to the measured movement of a stake network,or other collection of surface features, using a least-squares procedure. Error of the resulting fit varies as (LAt/7T)~ , where L is the stake separation, At is the time period between initial and final stake survey, and n is the number of stakes in the network. This relation sug...
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Measuring microbial abundance in glacier ice and identifying its controls is essential for a better understanding and quantification of biogeochemical processes in glacial ecosystems. However, cell enumeration of glacier ice samples is challenging due to typically low cell numbers and the presence of interfering mineral particles. We quantified for the first time the abundance of microbial cell...
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ژورنال
عنوان ژورنال: Geo-spatial Information Science
سال: 2012
ISSN: 1009-5020,1993-5153
DOI: 10.1080/10095020.2012.708160