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Singular value decomposition of Arctic Sea ice cover and overlying atmospheric circulation fluctuationsYi, Dingrong, 1969- January 1998 (has links)
No description available.
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The Geography of EgyptRistow, Walter W. January 1933 (has links)
No description available.
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Anumerical model for the estimation of solar radiation on rugged terrain /Anderson, Evelyn Carole January 1985 (has links)
No description available.
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Geomorphology and glacial geology in Nordaustlandet, Spitsbergen /Blake, Weston January 1962 (has links)
No description available.
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Interdiurnal characteristics of the winter season in southeastern United States /Senathirajah, Nallamma Subramaniam January 1958 (has links)
No description available.
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An empirical study of relative orientation errors in aerial triangulation /Forrest, Robert Brewster January 1964 (has links)
No description available.
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A numerical simulation of the annual cycle of sea ice in the Arctic and Antarctic /Parkinson, Claire Lucille January 1977 (has links)
No description available.
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Modelling the interannual variability of the Arctic sea ice coverArfeuille, Gilles January 1998 (has links)
No description available.
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A comparison of slope estimation methodsMathur, Priti 17 March 2010 (has links)
The study evaluates widely used slope estimation algorithms with the aim of determining similarities or differences between results obtained by each, the accuracy of methods in modelling actual slope, and the suitability of these methods for site-specific and non-site specific applications.
The data used in the study comprise of 24 artificial surfaces generated from mathematical equations and a natural surface represented by a USGS Digital Elevation Model of the Salem Quadrangle, Virginia. The concept of using artificial surfaces was to enable determination of accuracy without the requirement for field observations. The gradient calculated from partial derivatives of the equations was used to compare results from different methods. The natural surface was used to validate the findings of the study on artificial surfaces.
The results were then statistically evaluated using ANOVA and regression analysis. It was found that the methods could be used interchangeably for non-site-specific applications while for site-specific applications the differences could be very significant. / Master of Science
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The Bed Topography ofthe Reidda Glaciers / Reidda-glaciärernas bottentopografiAngergård, Tilda January 2024 (has links)
There are around 250 glaciers in Sweden, all of which are constantly changing. Knowledge about the bottom topography of glaciers can be used in many different fields and is therefore important to develop.Through ground-penetrating radar data it is possible to calculate ice thicknesses on glaciers, a method that has been used for a long time but is inefficient. At Uppsala University, the glaciology researchgroup is working on developing a new inverse method to find ice thicknesses and bottom topographyon glaciers more easily and less costly. They are testing their method on the Unna and Stour Reiddaglaciers, located in the Kebnekaise masiff just outside Kiruna. The Kebnekaise masiff are part of the Seves Nappes, which was created during the collision of the Laurentia and Baltica continents. The bedrock consists mostly of mafic rocks, but there are parts with varying resistance. This may influence the varying ice thickness. Evidence for overdeepenings in the area is believed to exist, where the glaciers themselves have created bowl-shaped depressions in the bedrock that affect how thick the ice canbecome. Lateral moraines also affect how quickly some parts of the glacier melt. To validate an inverse model method, a map based on radar measurements is needed to compare results. During the survey done in March 2024, radar measurements from the glacier was also taken.These measurements were processed by dewow filtering, normal moveout correction, depth calculations and glacier bottom marking. Based on an interpolation of the processed radar data, a map of the ice thickness of the two glaciers was made. The thickness of Unna Reidda varies from 0 to 123 meters depth and for Stour Reidda from 0 to 147 meters depth. The thickness of the glacier ice was then subtracted from the topography of the mountain to produce the bottom topographic map of the Reidda glaciers. / Det finns som kring 250 stycken glaciärer i Sverige som alla är i ständig förändring. Kunskap om glaciärers bottentopografi kan användas inom många olika fält och är därför viktig att ta fram. Genom markpenetrerande radar data är det möjligt att räkna ut is tjocklekar på glaciärer, en metod som har använts länge men som också är ineffektiv. På Uppsala universitet jobbar Forskargruppen inom glaciologi med att utveckla en ny inversmetod för att enklare och billigare ta reda på is tjocklekar samt bottentopografi på glaciärer. De prövar sin metod på Unna och Stour Reidda glaciärerna som ligger uppe i Kebnekaise-massivet strax utanför Kiruna. Kebnekaise-massivet hör till Seveskållan, som skapades under kollisionen mellan Laurentia och Baltica kontinenterna. Skållan utgörs mestadels av mafiskberggrund men det förkommer delar med varierande hårdhet. Något som eventuellt kan ha en effekt påden varierande is tjockleken. Bevis tros finnas för överfördjupning, där glaciärerna själv skapat skålformade nedbuktningar i berggrunden som påverkar hur tjock isen kan bli. Även laterala morrän påverkar hur snabbt vissa delar av glaciären smälter. För att validera inversmodells metoden behövs en karta baserad på radarmätningar för att jämföra resultat. Under insamling av data i mars 2024 togs även radarmätningar från glaciären. Dessa mätningar processades genom dewow filtrering, Normal Moveout korrektion, uträkningar av djup samt markeringav glaciärernas botten. Utifrån en interpolering av den processade radardata gjordes en karta över istjockleken av de båda glaciärerna. Unna Reidda tjocklek varierar mellan 0 till 123 meters djup och för Stour Reidda från 0 till 147 meters djup. Tjockleken på glaciärisarna drog sedan bort från fjällets topografi för att producera bottentopografisk karta över Reidda glaciärerna
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