Browsing Doctoral Theses / Doktorsavhandlingar Institutionen för geovetenskaper by Issue Date
Now showing items 21-40 of 57
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Cold-climate landforms on Mars and Earth-analogues in Svalbard
(2012-09-14)Periglacial landforms on Earth reflect cold-climate conditions and are intimately related to processes due to the presence of ground ice and perennially frozen ground, permafrost. The overall objective of this thesis is ... -
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 ... -
Phosphorus recycling in brackish and marine environments - Sediment investigations in situ in the Baltic Sea and the By Fjord
(2012-11-29)The phosphorus load to the oceans from land started to increase since around 1950 when man started to mine phosphorus-mineral from phosphorus-rich soils and bedrock. The increased use of phosphorus fertilizers in agriculture ... -
Observed and simulated changes in extreme precipitation and cold surges in China: 1961–2005
(2013-02-01)In the present work, precipitation and temperature related climate extremes are examined, with a focus on Mainland China. The objectives of this study are a) to identify targeted climate extremes and their changes during ... -
MODEL STUDIES OF FISH EGG AND LARVAL TRANSPORT IN THE KATTEGAT AND THE NORTH ATLANTIC
(2013-03-06)For the early life stages of fish, the dispersal and retention are important factors regarding present and future survivorship, growth and reproduction. The main objective of this thesis is to analyse fish egg and larval ... -
Precambrian Crustal Evolution of the Rehoboth Province, Southern Africa
(2013-05-08)This thesis uses U-Pb, Sm-Nd Lu-Hf, Ar-Ar and Oxygen isotope data on well-documented rock samples, to investigate crustal evolution of the Precambrian Rehoboth Province of Southern Africa. This province is defined by its ... -
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 ... -
Modelling the Dissolved Inorganic Carbon System in the Baltic Sea
(2013-10-04)Oceans are capable of storing part of the emitted anthropogenic carbon dioxide (CO2) due to the formation of carbonic acid and subsequent dissociation. CO2 is also assimilated by biota and the inorganic carbon system is ... -
Late Holocene spatiotemporal hydroclimatic variability over Fennoscandia inferred from tree-rings
(2014-01-27)There is a broad scientific consensus that the global climate is changing, and that human activity is a significant factor contributing to the change. The response of the hydrological cycle to the warming is far reaching, ... -
Predicting Spatial and Stratigraphic Quick-clay Distribution in SW Sweden
(2014-05-12)Clay sediments are associated with a wide variety of engineering problems, of which landslides, together with settlement, are the most investigated due to the large associated costs. Quick-clay deposits, which if disturbed ... -
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 ... -
Energy Efficiency in Winter Road Maintenance - A Road Climatological Perspective
(2015-05-07)Practices in winter road maintenance are dependent on the climate and weather impacting roads and the road users’ requirements. As in many other fields of transportation, it is of interest to investigate fuel efficiency ... -
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 ... -
Climate regulation provided by urban greening - examples from a high latitude city
(2015-11-06)Cities exert a strong influence on urban climate, and consequently on human health and wellbeing. This increases the importance of considering climate issues in urban planning, particularly in the context of global climate ... -
Land use GHG emissions and mitigation options, simulated by CoupModel
(2015-12-09)Climate change and greenhouse gas (GHG) emissions are one of the major challenges to the humankind of 21st Century. This thesis focuses on understanding, estimating and suggesting mitigation of the GHG emissions (mainly ... -
Modelling of the daytime and night-time urban thermal environment
(2016-03-11)The world’s urban population is expected to increase over the coming decades. To maintain and improve the health and well-being of urban citizens, it is important to increase our knowledge and develop methods for evaluating ... -
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 ... -
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 ... -
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 ... -
Nitrous Oxide Production in Agricultural Soil – Linking Biogeochemical Pathways and Drivers
(2018-05-09)Nitrous oxide (N2O) is a long-lasting and potent greenhouse gas responsible for depletion of stratospheric ozone. As the atmospheric N2O concentration reaches all-time highs, emission variability in space and time still ...