Browsing Doctoral Theses / Doktorsavhandlingar Institutionen för geovetenskaper by Title
Now showing items 34-53 of 55
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Rainfall variability, soils and land use changes in the Ethiopian highlands
(2013-09-16)Most farmers in the Ethiopian highlands are dependent on rain-fed agriculture. The indigenous cereal tef is the most important crop for the farmers in the highlands. The central highland is an environmentally fragile area ... -
Regional and local surface ozone variations in relation to meteorological conditions in Sweden
(2009-05-07)Air quality is strongly dependent on meteorological conditions. Atmospheric circulation encapsulates general information about local meteorological variables to some extent, and can serve as an explanatory variable for ... -
Rheological response to tectonic and volcanic deformation in Iceland
(2016-05-06)Iceland is one of the few places in the world where a Mid-Oceanic Ridge (MOR) is exposed on land, and this gives good opportunity to study geodynamic processes. Spreading of Mid-Atlantic Ocean Ridge (MAR) segments in Iceland ... -
Road climate studies with emphasis on road surface temperature variations and hoar frost risk
(2018-05-24)An effective road transportation system is a key enabler for national and global economic growth. In the wintertime, the presence of snow and ice on road surfaces reduces road surface friction and can result in serious ... -
Sedimentology and Geomorphology of Glacial Landforms in Southern Sweden
(2021-02-26)Ice sheets are disintegrating due to global warming. One factor controlling ice-sheet behavior is the processes active beneath the ice sheet. In particular, processes connected to glacial meltwater drainage are essential ... -
Simulated and observed change of precipitation and temperature in Europe with focus on the Greater Baltic Area
(2012-05-24)The regional climate of the Greater Baltic Area is complex and varies at a multitude of scales in space and time. This thesis contributes to increased understanding of climate change and climate variability in this area ... -
Spatiotemporal climate and atmospheric circulation variability in Asia inferred from tree rings
(2016-04-21)Observed 20th century warming trends accompanied by more frequent weather extremes such as droughts or intense rainfall events have consequences for societies and environments alike. In Asia, where the majority of the ... -
Studies of the Arctic Ocean sea ice cover and hydrothermal heat fluxes
(2012-10-26)Since reliable ice extent estimates from satellite data became available in 1979 the Arctic sea ice cover has followed a declining long term trend. Over the last decade the decline has accelerated with record low sea ice ... -
Summer Climate Variability during the Past 1200 Years in Central Scandinavia – A Tree-Ring Perspective
(2015-05-22)To set the current 20th century warming in a long-term context, significant efforts have been made to reconstruct hemispheric-to-global temperatures beyond the instrumental period. Tree-rings, which have annual resolution ... -
The Baltic Sea marine system - human impact and natural variations
(2010-09-07)The environmental state of the Baltic Sea system is influenced by both natural and anthropogenic factors. Water exchange with the adjacent ocean and within the system depend on large-scale atmospheric circulation and ... -
The Carbon Dioxide System in the Baltic Sea Surface Waters
(2011-05-26)The concentration of carbon dioxide (CO2) in the atmosphere is steadily increasing because of human activities such as fossil fuel burning. To understand how this is affecting the planet, several pieces of knowledge of the ... -
The Mesoproterozoic Hallandian event - a region-scale orogenic event in the Fennoscandian Shield
(2011-05-19)The Sveconorwegian Province occupies the southwestern part of the Fennoscandian Shield. The easternmost tectonic unit of the Province is the 1710-1660 Ma parautochthonous Eastern Segment, which bears the imprint of at least ... -
The Nitrogen Cycle in Soil – Climate Impact and Methodological Challenges in Natural Ecosystems
(2018-08-31)Nitrogen (N) is a fundamental element for life, and limiting in many terrestrial ecosystems. In non-N-fertilized ecosystems, the N inputs can be low, and the nutrient availability for plants is determined by the internal ... -
Towards an improved understanding of precipitation variations over the Tibetan Plateau
(2023-05-09)The Tibetan Plateau (TP) and surrounding regions are known as the ``Third Pole'' because of their polar-like environment and large reservoirs of fresh water. Due to the latter aspect, the TP is also considered the ``Water ... -
Towards prediction in ungauged aquifers – methods for comparative regional analysis
(2020-05-12)Hydrogeological investigations and in particular groundwater resource assessments are strongly reliant on understanding the factors controlling groundwater level dynamics. However, historical records of measured groundwater ... -
Tree rings and climate in Scandinavia and Southern Patagonia
(2017-11-30)The present knowledge of temperature variability during the past millennium has been greatly improved due to an increasing availability of reconstructions made based on paleoclimate proxies, such as tree-rings. These ... -
Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history
(2014-05-15)Instrumental meteorological observation are too short for trying to estimate climate change and variability on multi-decadal and centennial time-scales, and when trying to evaluate the response of the climate system to ... -
Trophic interactions in the tundra: Impacts of large mammal herbivory on carbon processes and fungal communities
(2023-12-11)Plant productivity is generally increasing in the Arctic as a consequence of accelerated climate change. The change in plant communities may coincide with a loss of carbon from Arctic soils due to increased decomposition ... -
Tropical cyclone induced extreme wind, rainfall, and floods in the Mekong River Basin
(2020-04-27)Increasing magnitude and frequency of climate extremes under global warming are threatening the socioeconomic development in many parts of the world. The Mekong River Basin (MRB) is a good example for how climate extremes ... -
The Tropospheric Aerosol - Measurements and Modelling. Case studies in Tanzania and Southeast Asia and development of models for size resolved aerosol simulations on the regional scale.
(2009-10-01)The tropospheric aerosol is a complex constituent of the atmosphere that has impacts on health and the climate. This thesis presents five different studies from Tanzania, Southeast Asia and Europe dealing with urban ...