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.
Results
Showing 1 to 20 of 46 for “"CO2 flux"”.
-
Boreal tree stem CO2 flux dynamics
Hiilidioksidilla (CO2) on tärkeä rooli puun toiminnassa, sillä sitä tarvitaan fotosynteesissä, käytetään biomassan kasvatukseen ja vapautetaan soluhengityksessä. Puunrungon CO2 vuo koostuu lähinnä soluhengityksestä, minkä vuoksi ilman lämpötilaa voidaan käyttää vuon ennustamiseen. Suurin osa …
-
ASSESSING DYNAMICS AND TRENDS OF CO2 FLUX ON THE LOUISIANA SHELF
… key factors influencing air-sea CO<sub>2</sub>flux on the Shelf. We first determined if the Louisiana Shelf followed observed trends of other oceanic areas. We predicted (hypothesis I) that the Shelf would see consistent seasonal variation, with winter and spring having negative fluxes (net …
-
Measurement and parameterisation of the air-sea CO2 flux in high winds
… instruments, including the autonomous air-sea flux system “AutoFlux” (Yelland et al., 2009) and an underway ?pCO2 system. An extensive set of direct, eddy covariance measurements of momentum, latent heat, sensible heat and CO2 flux was obtained over a wide range of open ocean conditions. The …
-
Understanding modelled sea-air CO2 flux biases in the Southern Ocean through the seasonal cycle
… vital component of the earth system as a sink of CO2 and heat, taking over 40% of the annual oceanic CO2 uptake (75% of global heat uptake), slowing down the accumulation of CO2 in the atmosphere and thus the rate of climate change. However, recent studies based on the Coupled Model …
-
CO₂ and Heat Release from Magmatic Hydrothermal Systems: Insights from CO₂ Flux and Other Modern Methods
… areas of steam heated ground. Ground based heat flux and CO2 flux surveys typically result in 100’s or 1000’s of individual flux measurements. These datasets are usually integrated to provide measures of total flow for the surface area under investigation (i.e. total heat flow, total CO2 flow). …
-
An Analytical Study of Air-Sea CO2 Gas Exchange in the Northwest Mississippi Bight Region
<p>With the continued increase of carbon dioxide (CO2) emissions, researchers are concerned with accumulation of excess CO2 within the atmosphere. The ocean is an important sink for the drawdown of atmospheric CO2 concentrations. Due to high spatial and temporal variability, CO2 fluxes in the …
-
Wood and soil-atmosphere carbon dioxide fluxes from a tropical forest ecosystem
… of controlling mechanisms and magnitude of CO2 sources from tropical forests will improve our ability to predict future impacts of climate changes. The research presented in this dissertation has focused on determining the magnitude and characteristics of the CO2 flux from tropical wood and …
-
Carbon fluxes at an upland blanket bog in the north Pennines
… were made of all of the key gaseous carbon fluxes, including the net CO2 flux, the soil CO2 flux and emissions as methane. A flux partitioning model was utilised to separate the net CO2 flux into its component parts. Values for the fluvial carbon losses from the site were taken from the …
-
Spatial and Temporal Trends in Greenhouse Gas Fluxes from a Temperate Floodplain along a Stream-Riparian-Upland Gradient
… terrestrial ecosystems. Research has shown GHG fluxes from hydrologically active landscapes such as floodplains and wetlands vary spatially and temporally in response to primary controls including soil moisture, soil temperature, and available nutrients. In this study, we performed a semimonthly …
-
How does plankton distribution and activity influence the variability of carbon dioxide uptake in the North Atlantic?
… analyse the variability of the carbon dioxide (CO2) sink in the North Atlantic at a range of spatial and temporal scales. Phytoplankton indices collected from the continuous plankton recorder (CPR) and the concentration of CO2 within the surface waters show that at seasonal time-scales …
-
Disturbance, Functional Diversity and Ecosystem Processes: Does Species Identity Matter?
… class and functional composition on soil CO2 flux. The interactive effects of disturbance and functional composition on soil CO2 flux demonstrated how the loss of functional diversity could lead to instability in ecosystem processes in disturbed ecosystems. In a dynamic ecosystem, I …
-
An Assessment of Radiative, Energy and Carbon Dioxide Fluxes over Three Urban Locations in Dublin
… (QH), latent heat (QE) and carbon dioxide (FC) fluxes. Net radiation (Q*) was 7.5 and 10% greater in summer and winter at the suburban location when compared to an urban location. Q* was preferentially channelled into the QH in summer and the QE in winter at the suburban location while QH …
-
A comparison of gas exchange models in the estimation of CO2 fluxes in the South Atlantic South of Africa for the summer season of 2008/2009
… is a problem in the determination of air-sea CO2 fluxes because of the number of different relationships used in calculating gas transfer velocities. There is also a problem with the CO2 sink in the Southern Ocean being greatly underestimated. Data were collected underway using an autonomous …
-
Application Of Composite Polymeric Membranes For Efficient Regeneration Of Physical Solvents
<p>The most dominant CO2 capture technology used for pre-combustion capture involves the application of physical solvents. Despite the low energy required to regenerate physical solvents and their high capacity for capturing and separating acid gases from the syngas produced in a gasification …
-
A Comparison of Gas Exchange Models in the Estimation of CO2 Fluxes in the South Atlantic South of Africa for the Summer Season of 2008/2009
… is a problem in the determination of air-sea CO2 fluxes because of the number of different relationships used in calculating gas transfer velocities. There is also a problem with the CO2 sink in the Southern Ocean being greatly underestimated. Data were collected underway using an autonomous …
-
Dynamics and Drivers: Carbon fluxes from temperate freshwater reservoirs
… sources of methane (CH4) and carbon dioxide (CO2) in the global carbon cycle, influencing the earth’s atmospheric energy budget. When considering freshwater reservoirs, these greenhouse gas emissions are anthropogenic, yet have received little research focus or integration into carbon budgets, …
-
Quantifying Greenhouse Gas Emissions and Ammonia Volatilization from Soil Amended with Excreta from Ruminants Fed Alternative Forage-based Diets
… in order to calculate carbon dioxide (CO2) and nitrous oxide (N2O) fluxes over 42 days. In both trials, the CO2 and NH3 emissions were relatively large initially. While the magnitude of the CO2 flux was numerically greater in April (spring) than in November (fall), the greatest CO2 flux …
-
Variability of the Global Ocean Carbon Sink (1998 through 2011)
… maps of the sea surface partial pressure of CO2 (pCO2) at a resolution of 1��1� for both the Atlantic Ocean from 1998 through 2007 and the global ocean from 1998 through 2011. From those, air–sea CO2 flux maps are computed using a standard gas exchange parameterization and high–resolution …
-
Decomposition of Urban CO2 Fluxes into Fossil and Biogenic Components using a novel Relaxed Eddy Accumulation System
… accumulation (REA) system for collection of 14CO2 air samples and its first application in the city of Zurich, Switzerland. The REA system, developed within the ICOS (Integrated Carbon Observation System) Cities project, selects air based on a 20 Hz vertical wind signal into an upwind and a …
Page 1 of 3