Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Umhverfisbreytingar"”.
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Umhverfisbreytingar á Nútíma í ljósi rannsókna á líf- og jarðefnafræði vatnasviða, litarefni þörunga og stöðugum samsætum í vatnaseti á Baffinlandi og Íslandi
… litarefni þörunga til að rannsaka og endurbyggja umhverfisbreytingar og sýnir einkennandi breytingar í þörungasamfélögum með tíma. Á Baffinlandi eru grænþörungar og háplöntur algengastar á fyrsta hluta Nútímans, en kísilgúrmagn eykst á seinni hluta Nútíma og á Litlu ísöldinni (1300 til 1900 CE). …
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Influence of river proximity on water quality and its impact on Caribbean Mangrove Oyster populations : a case study in Bowden Bay, St. Thomas, Jamaica
… Áframhaldandi rannsóknir ættu að skoða langtíma umhverfisbreytingar, erfðafjölbreytilika og hvernig þeir þættir hafa áhrif á ostrustofna.
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Upplifun hagsmunaaðila af samráðsferlinu við gerð stjórnunar- og verndaráætlunar Þjórsárdals
Umhverfisbreytingar valda því að mannkynið þurfi að takast á við auknar áskoranir. Meðal þeirra lausna sem við vinnum að er náttúruvernd. Þegar unnið er að náttúruvernd og friðlýsingu svæða á Íslandi þarf að gera svokallaða stjórnunar- og verndaráætlun sem notuð er til að leiðbeina stjórnendum og …
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Vestra-Gíslholtsvatn í Holtum. Túlkun kolefnisinnihalds í seti VGHV í ljósi umhverfisbreytinga
… að nota breytingar á kolefni til að segja til um umhverfisbreytingar á Nútíma eða síðustu 10.200 ár. Niðurstöður kolefnismælinganna gefa til kynna að vel sé hægt að sjá þær helstu breytingar í loftslagi sem vitað er um á Nútíma. Hlýindatímabil í upphafi Nútíma (Holocene Thermal Optimum) kemur fram …
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Nitrification inhibitors have minimal impact on microbial and Collembola communities in Danish arable soil
This study aimed to investigate the targeted and non-target impacts of nitrification inhibitors (NIs) on the soil microbial and collembola communities in arable soils under a spring barley cultivation system. By assessing soils where inhibitors were repeatedly applied alongside fertilizers, we …
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Soil-atmosphere fluxes of CO2 and CH4 in annual and perennial cropping systems in southern Sweden
Annual cropping systems dominate agricultural grain production, but have been linked to several key environmental issues, such as loss of biodiversity and pollution of groundwater. Newly developed perennial grains may offer solutions to some of those problems. Their longer roots and growing seasons …
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Effects of soil temperature on Sphagnum moss litter quality and decomposition in a subarctic environment
High latitude peatlands play a significant role in global soil carbon budgets, attributed to the slow decomposition rate of Sphagnum mosses that facilitates carbon sequestration through the build-up of peat. As climate change is predicted to increase soil temperatures and decomposition rates of …
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Vegetation on Icelandic Turf Houses and in Surrounding Habitats
Torfbæir eru tákn íslenskrar arfleifðar, byggðir að hluta úr torfi sem var meðal annars fengið úr efri lögum íslenskra mýra þar sem grös og starir voru ríkjandi. Torfbæir voru áður taldir merki fátæktar og í byrjun 20. aldar voru margir þeirra eyðilagðir. Þetta verkefni er hluti af verkefninu The …
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The future of Narsap Sermia: Documenting the retreat of a tidewater glacier in Southwest Greenland
The behaviour of Greenland’s tidewater glaciers is crucial for the understanding of the Greenland Ice Sheet. The retreat of those marine-terminating glaciers has far-reaching implications, impacting not only the regional hydrography but also the diverse fjord ecosystems. Here, this study …
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Biological diversity of epibenthic invertebrates in relation to environmental factors in lava caves around Lake Mývatn (N-E Iceland)
Biodiversity, and its understanding and maintenance, are nowadays concerns in many fields of sciences. In freshwater, epibenthic invertebrates are important for their environment as consumers at intermediate trophic level and as food resources for other organisms. Their sensitivity to environmental …
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Underlining the potential drivers of carbon allocation in Kernza® crops
The present study investigates the primary factors influencing carbon allocation in Thinopyrum intermedium (Kernza) during its first growth year at the PERENNIAL experimental site in Alnarp, Sweden. Focusing on the distribution of aboveground and belowground biomass and the role of soil properties, …
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Observing Seasonal Cycles in Greenhouse Gas Fluxes with Automatic Flushing Chambers in a Low-Arctic Lake
The Arctic is warming nearly four times faster than the global average. Greenhouse gases (GHG) are causing a changing climate which is affecting permafrost thaw, sea ice melt, and changing hydrological dynamics. Lakes in the Arctic and sub-Arctic regions are increasingly recognised as important …
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Married to the Lab. Tying the Knot of Art and Science
The aim of this thesis is to tie the knot of art and science, searching for ways to explain and explore complex atmospheric phenomena through art. Primary methods of research are poetry, video and performance art practice. The results of this thesis are five video performance art works as well as …
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“Influence of climate change on behavioural traits of Palaemon elegans, an invasive species in the Baltic Sea
The Baltic Sea is undergoing changes due to climate change, including an increase in its temperature. This may in turn lead to changes in the traits of the species that inhabit it, including non-endemic, invasive species. Palaemon elegans is a species native to the Atlantic Ocean that has been …
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Modeling the effect of the energy crisis on air quality in the Po Valley, Italy.
This thesis investigates the impact of the energy crisis on air quality in the Po Valley, Italy, with a focus on the effect of changes in methane consumption over the potential changes in wood burn ing consumption. The study employs the WRF-CHIMERE model to simulate the consequences of varying wood …
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Evaluating dNBR and CBI for Fire Severity Estimation in Fennoscandian Boreal Surface Fires
Fire severity—the magnitude of ecological change induced by fire—plays a critical role in shaping post-fire recovery dynamics, carbon cycling, and forest management decisions. In Fennoscandian boreal forests, however, accurate severity estimation using remote sensing remains challenging due to …
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SVALPEN Svalbard Radar Snow Penetration Experiment
Studying the extent and thickness of sea and glacial ice in a warming climate is important since they have both local and global significance in the form of feedback loops, climate effects, and ship transport, among others. While the extent of ice is well studied using satellite-based radar remote …
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Environmental Changes in Eastern Lapland during the last 50 years
The study is sought to study how and if the environment has changed in eastern Finnish Lapland in a long-term perspective. Variables related to the current state of the environment, are atmospheric composition and aerosols, meteorology, and biology. The study is based on measurements from Värriö …
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Phenology Effects on Carbon and Water Dynamics in a Pristine Boreal Fen A multi-decadal analysis from 2005-2007 & 2014-2022
Boreal peatlands are major constituents of the global carbon (C) and water cycles and therefore important climate regulators. These cycle dynamics are strongly determined by plant phenology (e.g.,vascular plant photosynthesis and seasonality) and evapotranspiration (ET), next to other abiotic …
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Non-growing season CO2 fluxes of a boreal fen – key drivers and responses to anomalous winter conditions
Non-growing season carbon fluxes can contribute to a significant amount of the full-year ecosystem carbon balance. Year-round net ecosystem exchange (NEE) data from 17 years was used to analyse the non-growing season carbon dioxide (CO2) fluxes together with environmental and meteorological …
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