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 51 for “"Carbon Budget"”.
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Carbon budget of a drained peatland in Western Iceland and initial effects of rewetting
Northern peatlands store vast amounts of organic carbon in their soils. They play an important role in the context of climate change, as they act as a valuable key source and sink for all the main greenhouse gases. In their natural stage, peatlands act as sinks of atmospheric CO2 and sources of …
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The Carbon Budget of the Mekong River Basin: A Spatial and Temporal Study of Chemical Weathering
The chemical weathering of silicate rocks with carbonic acid is thought to play an important role in the consumption of atmospheric carbon dioxide (CO$_{2}$), which regulates global climate over million--year timescales. However, the climatic implications of chemical weathering of carbonate rocks …
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Belowground Carbon Budget and Nutrient Uptake of Temperate Forest Species in Response to Elevated Carbon Dioxide and Temperature
A large proportion of carbon in forest ecosystems is lost from belowground through root respiration. Maintenance respiration of attached fine roots was measured on mature loblolly pine and sweetgum (Liquidambar styraciflua ) growing in atmospheric CO2 elevated by 200 mu1 1 -1 above ambient. Fine …
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Development of a framework for carbon budgets in South Africa
… the implementation of the Climate Change Act, carbon budget reporting will become mandatory in South Africa, and a proposed higher tax liability of R640 per tCO2e will be imposed on emissions exceeding allocated carbon budgets. In addition to the financial impact of exceeding allocated carbon …
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Carbon Pools, Dynamics and Budget of the Bruce Peninsula
… However, there is little research done on the carbon pools, their dynamics and the soil carbon budget. A more comprehensive understanding of the processes regulating the uptake and release of carbon dioxide with the atmosphere is needed. This thesis aims to 1) quantify how much carbon is stored …
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Carbon fluxes at an upland blanket bog in the north Pennines
… found in blanket bogs are significant stores of carbon. The degree to which these ecosystems are currently functioning as sinks or sources of carbon is not clear. There is a paucity of measurements from suitable sites but the available evidence suggests that certain sites might be close to being …
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Evaluation and Application of the Community Land Model for Simulating Energy and Carbon Exchange in Agricultural Ecosystems
… and assessed CLM’s performance in simulating carbon and energy exchange for the conterminous United States. The results indicated that CLM4-Crop has a biased phenology during the early growing season and underestimated carbon emissions from corn and soybean sites. The carbon budget for the …
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Investigating evidence of high frequency glacial eustacy in the Lower Mississippian (Tournasian) Lodgepole Formation of southwest Montana : insights from conodont oxygen isotopes
This study focuses on high-frequency, subtidal-carbonate cycles (1-8 m thick) within the Woodhurst Member of the Lower Mississippian Lodgepole Formation of southwest Montana. We combined conodont-oxygen isotopes (δ18Oapatite¬) and carbonate-carbon isotopes (δ13Ccarb) with cyclostratigraphy of …
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Homing in on Sufficiency: Testing and Developing Criteria for Measuring Housing Sufficiency
… was developed based on a sustainable housing carbon budget. When tested against 36 residential case studies, the average sustainable floor area was 9.4 m2 per person, indicating that current building practices and energy generation methods remain too carbon-intensive to allow for homes that …
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RECENT RIVERINE CARBON OF THE YELLOW RIVER: FLUXES, OUTGASSING AND BURIAL
Riverine carbon transport is an important component of global carbon cycle. Based on historical records and recent sampling during the period 2011-2012, the riverine carbon transport characteristics in the Yellow River were qualitatively and quantitatively investigated. Due to chemical weathering …
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Analysis of future carbon tax scenarios for South African gold mines
The South African Carbon Tax Act came into effect in 2019, and it places a price on the emissions of greenhouse gases (GHG). The second phase of the carbon tax will be implemented in 2023. Presently, there is uncertainty regarding the changes that will be made to tax policy during this review. This …
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Legal consideratios in developing and implementing the 2018 draft intergrated resources plan (IRP): a case study of the nuclear sector
… scenarios instead of the ‘base case’. The carbon budget (IRP6) and carbon budget plus market-linked gas price (IRP7) scenarios commission nuclear capacity of 4200 megawatts (MW) and 5600 MW respectively for the period 2031-2040. IRP 6 and 7 have 6 per cent (6.3GW) and 7 per cent (7.35 GW) …
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Aqueous carbon losses from the Glenfeshie Mòine Mhór
Healthy, functioning peatlands are a net carbon sink and are a globally important terrestrial carbon store alongside numerous other wider ecosystem benefits. Degradation of peatlands by unsustainable management and erosion can increase emissions of carbon dioxide (CO<sub>2</sub>) and methane …
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Tracing the global carbon cycle with bomb radiocarbon
Bomb radiocarbon (14C) emitted to the atmosphere by nuclear explosion tests has not yet reached equilibrium within the Earth carbon system. In the present thesis this fate of radiocarbon is investigated using coarse-grid models to trace high-precision 14CO2 observations available in the atmosphere …
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Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles
… settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based …
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Observing Seasonal Cycles in Greenhouse Gas Fluxes with Automatic Flushing Chambers in a Low-Arctic Lake
… recognised as important actors in the global carbon budget, acting as both sources and sinks of carbon dioxide (CO₂) and methane (CH₄). Despite their abundance, these lakes remain understudied due to harsh environmental conditions and logistical constraints. This study explores the use of …
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RESPONSE OF A SPARTINA PATENS-DOMINATED OLIGOHALINE MARSH TO NITROGEN ENRICHMENT IN COASTAL NORTH CAROLINA, USA.
… that play a significant role in the global carbon budget. Anthropogenic alterations to coastal landscapes can significantly impact these marsh ecosystems, though the actual loss of ecosystem functioning may depend on the type of marsh being impacted. Nitrogen loading into coastal …
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Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude
… climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all …
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Spatial and temporal dynamics of the terrestrial carbon cycle : assimilation of two decades of optical satellite data into a process-based global vegetation model
… the spatio-temporal distribution of terrestrial carbon fluxes for the time period of 1982 to 2002 simulated by a combination of the process-based dynamic global vegetation model LPJ and a 21-year time series of global AVHRR-fPAR data (fPAR – fraction of photosynthetically active radiation). …
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Estimates of global sources and sinks of carbon from land cover and land use changes
The distribution of sources and sinks of carbon over the land surface is dominated by changes in land use such as deforestation, reforestation, and agricultural management. Despite, the importance of land-use change in dominating long-term net terrestrial fluxes of carbon, estimates of the annual …
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