Дисертації з теми "Deep coal seam"
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Williams, Lindsey C. "The U.S. Atlantic commercial fishing industry and cold water coral conservation history, current trends and next steps /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 115 p, 2009. http://proquest.umi.com/pqdweb?did=1824796041&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаGalkiewicz, Julia Parker. "Microbial Ecology and Functional Genomics of Deep-Water Coral-Associated Microbes." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3111.
Повний текст джерелаLe, Goff-Vitry Marie-CeÌcile. "Molecular ecology of the deep-sea coral Lophelia pertusa in the North East Atlantic." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398819.
Повний текст джерелаGomez, Carlos E. "Ecological and physiological constraints of deep-sea corals in a changing environment." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/535228.
Повний текст джерелаPh.D.
Deep-water or cold-water corals are abundant and highly diverse, greatly increase habitat heterogeneity and species richness, thereby forming one of the most significant ecosystems in the deep sea. Despite this remote location, they are not removed from the different anthropogenic disturbances that commonly impact their shallow-water counterparts. The global decrease in seawater pH due to increases in atmospheric CO2 are changing the chemical properties of the seawater, decreasing the concentration of carbonate ions that are important elements for different physiological and ecological processes. Predictive models forecast a shoaling of the carbonate saturation in the water column due to OA, and suggest that cold-water corals are at high risk, since large areas of suitable habitat will experience suboptimal conditions by the end of the century. The main objective of this study was to explore the fate of the deep-water coral community in time of environmental change. To better understand the impact of climate change this study focused in two of the most important elements of deep-sea coral habitat, the reef forming coral Lophelia pertusa and the octocoral community, particularly the gorgonian Callogorgia delta. By means of controlled experiments, I examined the effects of long- and short-term exposures to seawater simulating future scenarios of ocean acidification on calcification and feeding efficiency. Finally In order to understand how the environment influences the community assembly, and ultimately how species cope with particular ecological filters, I integrated different aspects of biology such functional diversity and ecology into a more evolutionary context in the face of changing environment. My results suggest that I) deep-water corals responds negatively to future OA by lowering the calcification rates, II) not all individuals respond in the same way to OA with high intra-specific variability providing a potential for adaptation in the long-term III) there is a disruption in the balance between accretion and dissolution that in the long term can shift from net accretion to net dissolution, and IV) there is an evolutionary implication for certain morphological features in the coral community that can give an advantage under stresfull conditions. Nevertheless, the suboptimal conditions that deep-water corals will experience by the end of the century could potentially threaten their persistence, with potentially negative consequences for the future stability of this already fragile ecosystem.
Temple University--Theses
Burke, Andrea Ph D. Massachusetts Institute of Technology. "Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary ²³¹Pa/²³⁰Th." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70777.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references.
Radioactive isotopes can be used in paleoceanography both for dating samples and as tracers of ocean processes. Here I use radiocarbon and uranium series isotopes to investigate the ocean's role in climate change over the last deglaciation. I present a new method for rapid radiocarbon analyses as a means of age-screening deep-sea corals for further study. Based on age survey results, I selected forty corals from the Drake Passage and thirteen from the Reykjanes Ridge off Iceland and dated them with uranium series isotopes. The uranium series dates give independent ages that allow radiocarbon to be used as a tracer of circulation and carbon cycle changes. The radiocarbon records generated from the Drake Passage corals show increased stratification in the Southern Ocean during the last glacial maximum (LGM) that disappeared during the start of the deglaciation as atmospheric CO2 began to rise during Heinrich Stadial 1 (HI). Considering these data and using a simple mass budget calculation, I show that the drop in atmospheric radiocarbon activity during H1 can be explained given direct carbon exchange between the radiocarbon-depleted deep ocean and atmosphere, e.g. through the Southern Ocean. The Drake Passage radiocarbon records also show evidence for decreased air-sea gas exchange in the Southern Ocean during the Antarctic Cold Reversal/Belling-Allered coincident with the hiatus in the deglacial CO2 rise. During this time period in the North Atlantic, radiocarbon reconstructions from deep-sea corals collected from off Iceland show a similar ventilation rate to that observed today and during the Holocene. To further investigate changes in North Atlantic ventilation over the last deglaciation, I used an inverse model to assess the consistency of sedimentary 2m1 Pa/ 230Th ratios from the Holocene, Hl, and the LGM with the modern circulation. Although sedimentary 231Pa/230Th has been used to infer changes in the strength of the meridional overturning circulation in the past, I find that published data are consistent with the modern circulation during the LGM and Hi. These findings highlight the importance of giving due regard to the uncertainties in the behavior and spatial distribution of paleoceanographic tracers.
by Andrea Burke.
Ph.D.
Akhondzadeh, Hamed. "Pore scale study on permeability stimulation and hydrogen geostorage in coal seams." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2551.
Повний текст джерелаHenry, Lara. "Metabolism in corals from Antarctica, the deep-sea, and the shallow subtropics: contrasts in temperature, depth, and light." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4903.
Повний текст джерелаGeorgian, Sam Ellis. "ENVIRONMENTAL AND ENERGETIC CONSTRAINTS ON COLD-WATER CORALS." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/382890.
Повний текст джерелаPh.D.
Cold-water corals act as critical foundation species in the deep sea by creating extensive three-dimensional habitat structures that support biodiversity hotspots. There is currently a paucity of data concerning the environmental requirements and physiology of cold-water corals, severely limiting our ability to predict how resilient they will be to future environmental change. Cold-water corals are expected to be particularly vulnerable to the effects of ocean acidification, the reduction in seawater pH and associated changes to the carbonate system caused by anthropogenic CO2 emissions. Here, the ecological niche and physiology of the cold-water coral Lophelia pertusa is explored to predict its sensitivity to ocean acidification. Species distribution models were generated in order to quantify L. pertusa’s niche in the Gulf of Mexico with regard to parameters including seafloor topography, the carbonate system, and the availability of hard substrate. A robust oceanographic assessment of the Gulf of Mexico was conducted in order to characterize the current environmental conditions at benthic sites, with a focus on establishing the baseline carbonate system in L. pertusa habitats. Finally, an experimental approach was used to test the physiological response of biogeographically separated L. pertusa populations from the Gulf of Mexico and the Norwegian coast to ocean acidification. Based on my findings, it appears that L. pertusa already persists near the edge of its viable niche space in some locations, and therefore may be highly vulnerable to environmental change. However, experimental results suggest that some populations may be surprisingly resilient to ocean acidification, yielding broad implications for the continued persistence of cold-water corals in future oceans.
Temple University--Theses
Dunlop, Erik Christopher. "Controls on Gas Production from Permian Ultra-deep Coal Seams of the Cooper Basin: Expanding Reservoir Boundary Theory." Thesis, 2019. http://hdl.handle.net/2440/123421.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2020
Mughal, Mehreen. "Eguchipsammia fistula Microsatellite Development and Population Analysis." Thesis, 2012. http://hdl.handle.net/10754/262733.
Повний текст джерелаEltgroth, Selene Farrell. "Unraveling deep-ocean connections to climate with deep-sea coral records of radiocarbon and Cd/Ca." Thesis, 2006. https://thesis.library.caltech.edu/2104/2/01Chapter1.pdf.
Повний текст джерелаYum, Lauren. "Revealing Holobiont Structure and Function of Three Red Sea Deep-Sea Corals." Diss., 2014. http://hdl.handle.net/10754/336497.
Повний текст джерелаHines, Sophia Katharine Vizza. "Glacial Ocean Dynamics: Insight from Deep-Sea Coral Reconstructions and A Time-Dependent Dynamical Box Model." Thesis, 2018. https://thesis.library.caltech.edu/10539/7/glacial-ocean-dynamics_Revised10252017.pdf.
Повний текст джерелаGlacial-interglacial cycles, occurring at a period of approximately 100,000 years, have dominated Earth's climate over the past 800,000 years. These cycles involve major changes in land ice, global sea level, ocean circulation, and the carbon cycle. While it is generally agreed that the ultimate driver of global climate is changes in insolation, glacial cycles do not look like insolation forcing. Notably, there is a highly non-linear warming response at 100,000 years to a relatively small forcing, implicating a more complicated system of biogeochemical and physical drivers. The ocean plays a pivotal role in glacial-interglacial climate through direct equator-to-pole transport of heat and its role in the carbon cycle. The deep ocean contains 60 times more carbon than the atmosphere, and therefore even small changes in ocean circulation can have a large impact on atmospheric CO2, a crucial amplifier in the climate system. In order to better understand the role that ocean circulation plays in glacial-interglacial climate we focus on the last glacial-interglacial transition. In this thesis, we present reconstructions of changes in intermediate water circulation and explore a new time-dependent dynamical box model. We reconstruct circulation using radiocarbon and clumped isotope measurements on U/Th dated deep-sea corals from the New England and Corner Rise Seamounts in the western basin of the North Atlantic and from south of Tasmania in the Indo-Pacific sector of the Southern Ocean. Our new time-dependent model contains key aspects of ocean physics, including Southern Ocean Residual Mean theory, and allows us to explore dynamical mechanisms which drive abrupt climate transitions during the last glacial period.
In Chapter 2 we present a compilation of reconnaissance dated deep-sea corals from the Caltech collection. Reconnaissance dating facilitates sample selection for our high-precision radiocarbon and temperature time series and patterns in the depth distribution of deep-sea corals over time contain additional relevant climate information. In Chapter 3, we present a high-resolution radiocarbon record from south of Tasmania which highlights variability in Southern Ocean Intermediate Water radiocarbon during the deglaciation, particularly during the Antarctic Cold Reversal. We use our radiocarbon data, in combination with other deglacial climate records, to infer changes in overturning circulation configuration across this time interval. In Chapter 4 we present our time-dependent dynamical box model. Our model displays hysteresis in basin stratification and Southern Ocean isopycnal outcrop position as a function of North Atlantic Deep Water formation rate. In a dynamical system, hysteresis implies that there are multiple stable states, and switches between these states can lead to abrupt transitions, such as those observed during the middle of the last glacial period. In Chapter 5 we present paired radiocarbon and temperature time series from the North Atlantic and Southern Ocean spanning the late part of the last glacial. We explore the mechanisms driving trends in radiocarbon and temperature by looking at cross-plots of the data, and we make inferences about changes in circulation configuration using insight gained from our dynamical box model.
Strzepek, Kelly Michelle. "Deep-sea coral amino acid archives of marine ecosystem function in east and southeast Australian waters." Phd thesis, 2015. http://hdl.handle.net/1885/150690.
Повний текст джерелаDu, Preez Cherisse. "Resolving relationships between deep-sea benthic diversity and multi-scale topographic heterogeneity." Thesis, 2014. http://hdl.handle.net/1828/5828.
Повний текст джерелаGraduate
0329
0416
0799
cdupreez@uvic.ca
Muller, Anne. "Deep-sea sediment core and coral reconstructions of the Late Quaternary paleoceanography of the eastern Indian Ocean." Phd thesis, 2002. http://hdl.handle.net/1885/151776.
Повний текст джерелаHornung, Jonathan P. "Exploring the potential for using deep-sea bamboo corals (Isidella sp.) for paleoceanographic reconstructions." Thesis, 2011. http://hdl.handle.net/1957/27661.
Повний текст джерелаGraduation date: 2012
Gonçalves, Guilherme Sampaio Rodrigues. "Fishing Impact on Deep-Sea Cold-Water Coral Communities of the Azores: Contribution to Descriptor 6 of the Marine Strategy Framework Directive." Master's thesis, 2021. https://hdl.handle.net/10216/137457.
Повний текст джерела