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Fletta eftir deild "Jarðvísindadeild (HÍ)"
Atriði 21-38 af 38
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021-01)The extent of compositional and lithological heterogeneity in Earth’s convecting mantle, caused by the recycling of oceanic and continental lithosphere, has long been a subject of interest to geochemists and geophysicists. A fundamental outstanding ... -
(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2018-11-29)The mass balance of a glacier is strongly connected to climate. At high latitudes, mass balance is typically controlled by snow accumulation during the winter and the glacier ablation during the summer. In Iceland, direct mass balance observations ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2017-04-19)In-situ carbonation of basaltic rocks could provide a carbon storage solution for the long term. Permanence is essential for the success and public acceptance of carbon storage. The aim of this study was twofold, to evaluate and make a first estimate ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-10-23)The reduction of carbon dioxide (CO2) emissions in the atmosphere is currently one of the main challenges facing humanity. One solution is carbon capture from concentrated sources and directly from the atmosphere, and long term storage in rocks. Basaltic ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2017)Molybdenum isotopes are used to quantify changes in Earth’s paleoredox conditions but their application relies upon a simplified model in which rivers dominate the ocean input with minor contributions from hydrothermal fluids. The effect of groundwater ...
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(University of Turku; University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2020-11-13)Tephrochronology is a high-precision dating method that uses volcanic ash horizons as isochrons in correlating and dating geological records and archaeological sites. First developed in the volcanic regions of the world, tephrochronology has expanded ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-11)Large and complete sections through glacial landforms formed in subaqueous environments are rare, impeding our knowledge of their internal composition and the processes responsible for their formation. Following the last deglaciation of the Icelandic ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-04)Iceland’s position at the confluence of major oceanic and atmospheric fronts results in a highly sensitive climate evident in both instrumental and paleo records. However, open questions still remain regarding the pre-instrumental evolution of climate, ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-12-13)An extensive geophysical survey comprising over 400 MT and 515 gravity stations on the Korosi, Paka and Silali volcanoes in the northern Kenya rift was conducted in order to assess the occurrence of geothermal resources in the context of the geophysics ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019)This dissertation describes the research results from applying regional climate models (RCMs) to simulate the near-past and future evolution of Vatnajökull, the largest ice cap in Iceland, and investigate the sensitivity of ablation to albedo and spring ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2022-02-25)Volatile species (e.g., H2O, He, B, CO2, S, Cl) and their isotopes in volcanic materials provide a unique, but underexplored archive of information about magmatic processes and planetary evolution. This study aims to improve our understanding regarding ...
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(Bergur Einarsson, 2018-05-23)Continuous GPS measurements on three broad and gently sloping temperate ice-cap outlets in southern and western Vatnajökull, southeast Iceland, and in northern Hofsjökull, central Iceland, are the subject of this thesis. The measurements show events ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2017-12-18)Thermal anomalies are observed at many volcanoes, resulting from geothermal and magmatic activity, and are usually difficult to quantify since the measurement of heat fluxes from the ground to the atmosphere is subject to large uncertainties. However, ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2023-03)The chemical interaction between seawater and basalt at low temperatures (≤150°C) ranks among the more significant factors controlling the composition of seawater and the oceanic crust. However, the time-integrated geochemical and petrographic outcomes ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2019-08-27)Dust is an important component of the earth-atmosphere system, affecting amongst other things air quality, vegetation, infrastructure, animal and human health. Iceland produces a large amount of dust, with dust storms reported frequently especially ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021-02)The physico-chemical properties of magma storage reservoirs in multi-level magmatic systems may change with time, along with the timescales at which crystals and melts are processed throughout the crust. In this thesis, I use an integrated approach ...
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(University of Iceland, School of Engineering and Natural Sciences, Faculty of Earth Sciences, 2021)Flood lavas (FL), or high magnitude (1–100 km3) basaltic fissure eruptions have a recurrence interval of 250–500 years in Iceland. These events can produce atmospheric volcanic pollution at tropospheric–stratospheric levels via their sulfur (S) emissions. ...
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(PhD-defence at University of Copenhagen, 2017-08-25)Iceland is one of the most active terrestrial volcanic regions on Earth with an average of more than 20 eruptions per century. Around 80% of all events are tephra generating explosive eruptions, but less than 10 % of all known tephra layers have been ...
Atriði 21-38 af 38