To see the other types of publications on this topic, follow the link: STABLE CARBON ISOTOPE.

Dissertations / Theses on the topic 'STABLE CARBON ISOTOPE'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'STABLE CARBON ISOTOPE.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Broadmeadow, Mark. "Stable carbon isotope discrimination in forest canopies." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386693.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kim, Moon Koo. "Stable carbon isotope ratio of polycyclic aromatic hydrocarbons (PAHs) in the environment: validation of isolation and stable carbon isotope analysis methods." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1099.

Full text
Abstract:
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous, toxic contaminants that are released to the environment from various petrogenic and pyrogenic sources. In an effort to more clearly identify and trace sources of PAHs in the environment, purification and compound specific isotope analysis methods were developed to accurately measure the stable carbon isotope ratio of individual PAHs. Development of the method included improving accuracy and precision of the isotopic measurement by producing highly pure extracts using various chromatographic techniques. The method was refined by improving
APA, Harvard, Vancouver, ISO, and other styles
3

Eek, Magnus. "Environmental control of stable carbon isotope systematics in Emiliania huxleyi." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0017/NQ52759.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Lamb, Clare. "Stable carbon isotope variation during natural chloromethane and bromomethane production." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343035.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Boller, Amanda J. "Stable carbon isotope discrimination by rubisco enzymes relevant to the global carbon cycle." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4291.

Full text
Abstract:
Five different forms of ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO; IA, IB, IC, ID, II), the carboxylase of the Calvin-Benson-Bassham cycle (CBB), are utilized by plants, algae and autotrophic bacteria for carbon fixation. Discrimination against 13C by RubisCO is a major factor dictating the stable carbon isotopic composition (δ13C = {[13C/12C sample/13C/12C standard] - 1} X 1000) of biomass. To date, isotope discrimination, expressed as ε values (={[12k/13k] - 1} X 1000; 12k and 13k = rates of 12C and 13C fixation) has been measured for form IA, IB, and II RubisCOs from only a f
APA, Harvard, Vancouver, ISO, and other styles
6

Carr, R. H. "High sensitivity stable carbon isotope ratio mass spectrometry : instrument development application." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303835.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Webb, Megan. "Environmental controls of stable carbon isotope values in freshwater diatom silica." Thesis, Lancaster University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.747983.

Full text
Abstract:
Improved understanding of the impact of catchment processes on freshwater carbon cycling would aid prediction of carbon flux attributed to changes in climate or land use. Carbon transfer through terrestrial and aquatic environments can be traced using stable carbon isotopic analysis (δ13C). A refined method of δ13C, free from host effects, is the utilisation of diatom-bound carbon (δ13Cdiatom)-
APA, Harvard, Vancouver, ISO, and other styles
8

Burnett, Richard Lee. "Stable Carbon Isotope Evidence of Ancient Maya Agriculture at Tikal, Guatemala." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3135.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Vaiglova, Petra. "Neolithic agricultural management in the Eastern Mediterranean : new insight from a multi-isotope approach." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:c8824136-da35-43b2-a700-f458d0cc2fdf.

Full text
Abstract:
The work presented in this dissertation explores the nature of agro-pastoral strategies developed by Neolithic farmers as a way to understand how early food production was inter-twined with environmental and socio-economic opportunities and constraints. Towards this end, a multi-isotope approach is used to address questions of scale and intensity of crop cultivation and animal management at the archaeological sites of Kouphovouno, southern Greece, Makriyalos, northern Greece, and Çatalhöyük, south-central Turkey. Measurements of stable carbon, nitrogen, oxygen and strontium isotope values o
APA, Harvard, Vancouver, ISO, and other styles
10

Heerden, Leon Andre van. "A nitrogen and carbon stable isotope study of some Western Australian diamonds." Thesis, Open University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262015.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Mikhail, S. "Stable isotope fractionation during diamond growth and the Earth's deep carbon cycle." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1333245/.

Full text
Abstract:
The flux of carbon between the mantle and crustal reservoirs can have a large impact on the melting of mantle rocks, the long and short term stability of the climate, and the growth of a very precious mineral; diamond. Diamond can be as young as 200 Ma and as old as > 4000 Ma, which is most of Earth’s entire 4500 Ma history and can also contain samples of the Earth’s mantle over a depth range of > 600 km, from the base of the crust and into the lower mantle. This spatial and temporal sampling of the Earth is unrivalled; therefore the study of mantle diamond is the best way to place constraints
APA, Harvard, Vancouver, ISO, and other styles
12

Huff, Amy K. "Multiple stable oxygen isotope analysis of atmospheric carbon monoxide and its sources /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9835376.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Leavitt, Steven W., Austin Long, and Jeffrey S. Dean. "Tree-Ring Dating Through Pattern-Matching of Stable-Carbon Isotope Time Series." Tree-Ring Society, 1985. http://hdl.handle.net/10150/261321.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Pironti, Concetta. "Innovative applications of stable carbon isotope ratio in environmental and food chemistry." Doctoral thesis, Universita degli studi di Salerno, 2018. http://hdl.handle.net/10556/3022.

Full text
Abstract:
2016 - 2017<br>In the last year, the stable isotope ratio analysis has become a useful tool with many applications in different scientific area. In particular the characteristic isotope signature of materials has permitted to identify authenticity and traceability of food sample and isotope composition has become a valuable marker in environmental studies. This work shows the applicability of analytical methods for isotopic carbon determination in food and environmental samples and the innovative use of δ13C in cultural heritage as valuable tool to trace pollutant fate. The first part is dedic
APA, Harvard, Vancouver, ISO, and other styles
15

Lee, Kern Y. "Carbon Cycling in Tropical Rivers: A Carbon Isotope Reconnaissance Study of the Langat and Kelantan Basins." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30429.

Full text
Abstract:
Despite the importance of tropical rivers to the global carbon cycle, the nature of carbon cycling within these watersheds has been dealt with by only a handful of studies. The current work attempts to address this lack of information, using stable isotope and concentration measurements to constrain sources and sinks of carbon in two Peninsular Malaysian watersheds. The basins are located on the central-western and northeastern coasts of the Malaysian Peninsula, and are drained by the Langat and Kelantan Rivers, respectively. Water samples were collected from three points along the two rivers
APA, Harvard, Vancouver, ISO, and other styles
16

Cassar, Nicolas. "Carbon-concentrating mechanisms and [beta]-carboxylation their potential contribution to marine photosynthetic carbon isotope fractionation /." Thesis, University of Hawaii at Manoa, 2003. http://proquest.umi.com/pqdweb?index=0&did=765084611&SrchMode=2&sid=6&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1233178277&clientId=23440.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Trandel, Marlee Anne. "Nitrogen and Carbon Stable Isotopes in Organically and Conventionally Grown Tomatoes." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2013.

Full text
Abstract:
Tomatoes (Lycopersicon esculentum L.) require high amounts of nitrogen to maximize fruit production. The type of nitrogen and timing of fertilizer applications are important in tomato production systems to reduce nitrogen losses while optimizing yields. A two-year greenhouse study was conducted to determine the effects of organic and inorganic fertilization treatments on nitrogen and carbon isotopic compositions of tomato plant leaves and fruit at immature and mature stages of plant growth. The carbon and nitrogen isotopic ratios together will also help to better depict trends that develop fro
APA, Harvard, Vancouver, ISO, and other styles
18

Bostic, Joshua Neilson. "Stable Isotope Variability in the American Food Supply: Implications for Dietary Reconstruction Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73870.

Full text
Abstract:
Stable isotope ratios of carbon (δ¹³C) and nitrogen (δ¹⁵N) in human tissues, which reflect the stable isotope composition of the diet, offer numerous applications in the field of nutrition. One of the biggest contributors to uncertainty in stable isotope dietary reconstruction applications is potential variability in the isotopic composition of foods. No prior studies have evaluated the existing food carbon and nitrogen stable isotope data in an effort to determine broad-scale patterns and characterize the degree of variability of stable isotopes within the American diet. The purpose of thi
APA, Harvard, Vancouver, ISO, and other styles
19

Yoshii, Koichi. "Carbon and nitrogen stable isotope study of ecosystem and paleoenvironment in Lake Baikal." 京都大学 (Kyoto University), 1999. http://hdl.handle.net/2433/181447.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Gromov, Sergey S. [Verfasser]. "Stable isotope composition of atmospheric carbon monoxide : a modelling study / Sergey S. Gromov." Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1051305497/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Fichtler, Esther, Gerhard Helle, and Martin Worbes. "Stable-Carbon Isotope Time Series From Tropical Tree Rings Indicate A Precipitation Signal." Tree-Ring Society, 2010. http://hdl.handle.net/10150/622616.

Full text
Abstract:
Although studies on stable-carbon isotopes in trees from temperate zones provide abundant paleoclimatic data, tropical trees are still understudied in this context. Therefore this study examined the variability of intra- and inter-annual stable-carbon isotopic pattern in several tree species from various tropical climates. The 𝛿¹³C values of samples of 12 broadleaved trees (seven species) from various paleotropical and neotropical sites along a climatic moisture gradient were investigated. The inter-annual variability between species and sites was studied. Further the relationship between 𝛿¹³
APA, Harvard, Vancouver, ISO, and other styles
22

Thomas, Phaedra. "Stable Carbon Isotope Discrimination by Form IC RubisCO from Rhodobacter sphaeroides." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002611.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Bedaso, Zelalem K. "Stable Isotope Studies of Paleoenvironment and Paleoclimate from Afar, Ethiopia." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3004.

Full text
Abstract:
ABSTRACT The sedimentary deposits of the Hadar Formation at Dikika and the Mount Galili Formation at Galili preserve a wealth of paleoenvironmental and paleoclimatic records spanning the last 5.29 Ma. Stable carbon and oxygen isotopic compositions of herbivore tooth enamel were analyzed for more than 600 specimens of 15 different taxa from 10 stratigraphic intervals. The application of carbon and oxygen isotopes here aims principally at reconstructing shifts in the relative abundance of C4 grasses, and its implications for climate indicators including temperature, aridity, and seasonality. The
APA, Harvard, Vancouver, ISO, and other styles
24

Evans, Claire Jane. "Exploring the carbon dynamics of the plant-soil food web using biomolecular and stable carbon isotope approaches." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419146.

Full text
APA, Harvard, Vancouver, ISO, and other styles
25

Lockheart, Matthew James. "Isotope compositions and distributions of individual compounds as indicators for environmental conditions : comparisons between contemporary and Clarkia fossil leaves." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389098.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Wallace, Michael Paul. "Crop watering practices in the Neolithic and Bronze Age : the stable carbon isotope approach." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578700.

Full text
Abstract:
In the ancient past, agriculture was central to the daily routines of life and economic organisation. The major limiting factor on crop production in dry regions, such as Western Asia, is the availability of water. In these regions. rainfed crops are susceptible to drought-induced failure and, while farmers can water their crops artificially, this places demands on labour and water supplies. The effort and resources afforded to crops by farmers can indicate the scale of production. whereas the preferential treatment of certain crops over others offers insights into the cultural and economic ro
APA, Harvard, Vancouver, ISO, and other styles
27

Anderson, Kelly C. "Stable carbon and nitrogen isotope analyses of subfossil rats from Liang Bua (Flores, Indonesia)." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4837.

Full text
Abstract:
This research study investigated the level of bone collagen preservation of rat femora from Liang Bua cave on the island of Flores, Indonesia, as well as conducted carbon and nitrogen stable isotopic analyses on well preserved samples. Although Flores is located in a hot intermediate tropical zone and the burial environment of the bone samples within the cave is considered less than optimal for collagen preservation, significant preservation of the bone collagen was found. Collagen yields, C:N ratio and carbon and nitrogen concentrations were investigated. However, this research study argues t
APA, Harvard, Vancouver, ISO, and other styles
28

Beramendi, Orosco Laura E. "Catalytic hydropyrolysis of wood to prepare lignin-enriched residues for stable carbon isotope analysis." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404040.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Alling, Vanja. "Terrestrial organic carbon dynamics in Arctic coastal areas : budgets and multiple stable isotope approaches." Doctoral thesis, Stockholms universitet, Institutionen för tillämpad miljövetenskap (ITM), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-43455.

Full text
Abstract:
Arctic rivers transport 31-42 Tg organic carbon (OC) each year to the Arctic Ocean, which is equal to 10% of the global riverine OC discharge. Since the Arctic Ocean only holds approximately 1% of the global ocean volume, the influence of terrestrially derived organic carbon (OCter) in the Arctic Ocean is relatively high. Despite the global importance of this region the behavior of the, by far largest fraction of the OCter, the dissolved organic carbon (DOC) in Arctic and sub-arctic estuaries is still a matter of debate. This thesis describes data originating from field cruises in Arctic and s
APA, Harvard, Vancouver, ISO, and other styles
30

Suh, Yeon Jee. "Leaf Wax Stable Isotopes as Paleovegetation and Paleohydrologic Proxies: From a Modern Calibration Study to a Paleoclimate Application." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1512045032087257.

Full text
APA, Harvard, Vancouver, ISO, and other styles
31

Czuba, Eva. "Development of a technique to study stable carbon isotope composition of NMHCs in ambient air." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0020/MQ56169.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Dethloff, Frederik. "In vivo 13C stable isotope tracing of single leaf development in the cold." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/7048/.

Full text
Abstract:
Measuring the metabolite profile of plants can be a strong phenotyping tool, but the changes of metabolite pool sizes are often difficult to interpret, not least because metabolite pool sizes may stay constant while carbon flows are altered and vice versa. Hence, measuring the carbon allocation of metabolites enables a better understanding of the metabolic phenotype. The main challenge of such measurements is the in vivo integration of a stable or radioactive label into a plant without perturbation of the system. To follow the carbon flow of a precursor metabolite, a method is developed in th
APA, Harvard, Vancouver, ISO, and other styles
33

Rauschenberg, Carlton David. "Microbial carbon sources on the shelf and slope of the northwestern Gulf of Mexico." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4173.

Full text
Abstract:
Over the past five years, gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS) analyses of phospholipid fatty acids (PLFAs) has been increasingly used to link organic matter (OM) sources with sedimentary bacteria. This technique has been applied across diverse estuarine and coastal sediments, including lower Laguna Madre, TX, an oligotrophic, coastal lagoon dominated by a single OM source, seagrasses; shelf stations, a eutrophic coastal region receiving multiple sources of OM, hypoxic regions that occur seasonally and deep slope and abyssal plain sediments of the Gulf of M
APA, Harvard, Vancouver, ISO, and other styles
34

Evans, Samantha Lorraine. "Carbon and Nitrogen Stable Isotopic Patterns in South Florida Coastal Ecosystems: Modern and Paleoceanographic Perspectives." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/189.

Full text
Abstract:
Long term management plans for restoration of natural flow conditions through the Everglades increase the importance of understanding potential nutrient impacts of increased freshwater delivery on coastal biogeochemistry. The present study sought to increase understanding of the coastal marine system of South Florida under modern conditions and through the anthropogenic changes in the last century, on scales ranging from individual nutrient cycle processes to seasonal patterns in organic material (OM) under varying hydrodynamic regime, to century scale analysis of sedimentary records. In all a
APA, Harvard, Vancouver, ISO, and other styles
35

Esposito, Mario. "Stable carbon isotope analysis of seawater samples : a new approach to assess CO2 effects on the marine carbon cycle." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/412277/.

Full text
Abstract:
Stable isotope ratio analyses offer a unique opportunity to obtain information about ecosystem dynamics, patterns and processes. The anthropogenic contribution to the global atmospheric CO2 rise through fossil fuel combustion, deforestation and other related human activities has changed the stable carbon isotope composition (δ13C) of the atmosphere over the past 200 years. Changes in the carbon isotopic patterns of terrestrial biosphere, lithosphere and oceans are also expected. The global ocean has been acting as a net sink for CO2 emissions and although it moderates the climate, it is curren
APA, Harvard, Vancouver, ISO, and other styles
36

Leggett, Michael Frederick. "Food-web dynamics of Lake Ontario as determined by carbon and nitrogen stable isotope analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ32838.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
37

Collett, Martin. "Multi-proxy stable oxygen and carbon isotope evidence for Holocene climate change in western Ireland." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250327.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

Twiddy, Edward James. "Applications of stable carbon and oxygen isotope analysis to some aspects of coastal environmental change." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/1582/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Reitsema, Laurie Jean. "Stable Carbon and Nitrogen Isotope Analysis of Human Diet Change in Prehistoric and Historic Poland." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1330969837.

Full text
APA, Harvard, Vancouver, ISO, and other styles
40

Oakes, Joanne. "Microalgae and Mangroves as Carbon Sources for Estuarine Invertebrates: Evidence from Stable Isotope Enrichment Experiments." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/365499.

Full text
Abstract:
The importance of different sources of carbon (energy) supporting secondary productivity in estuaries and coastal waters is still rather uncertain, despite decades of research on this topic. One of the major uncertainties is the relative importance of carbon from macrophyte detritus and microalgae, particularly diatoms and cyanobacteria within sediments (microphytobenthos, MPB). Existing methods have been unable to determine their relative contributions to consumer nutrition. This thesis addresses some of the limitations of existing methods, and then uses an innovative combination of technique
APA, Harvard, Vancouver, ISO, and other styles
41

Basapuram, Laxmi Gayatri Devi. "Lake Victoria - Carbon, Nitrogen, Phosphorus and Stable Isotope (δ13C) comparison between lake and catchment sediments". Thesis, Linköpings universitet, Tema Miljöförändring, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149283.

Full text
Abstract:
Lake Victoria situated in East Africa faces an acute problem with eutrophication. Many reasons like agricultural production, industrialization, anthropogenic processes, the introduction of species, and economic activities have caused a stress to the overall well-being of the lake. Excess carbon, nitrogen, and phosphorus drive an increase in productivity which affects eutrophication. Previous studies on sediments and nutrient concentrations in the lake have concluded that nutrient concentrations increase due to release from the catchment. This study focuses on catchment sediments collected from
APA, Harvard, Vancouver, ISO, and other styles
42

Perkins, Matthew James. "Quantifying the effects of biodiversity on food web structure : a stable isotope approach." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/13941.

Full text
Abstract:
Food web structure is of underlying importance to ecological functions and processes. Whilst it is understood that a range of biotic and abiotic factors affect structure, relatively little is known of the role of biodiversity per se in structuring food webs. In this thesis I utilise novel multi-dimensional estimates of food web structure based on stable isotope ratios of nitrogen (δ15N) and carbon (δ13C) to quantify structural responses to changing community diversity. I additionally investigate methodological aspects of sample preparation and stable isotope quantifications of food chains. Usi
APA, Harvard, Vancouver, ISO, and other styles
43

Brookman, Tom Hugo. "Stable isotope dendroclimatology of New Zealand kauri (Agathis australis (D. Don) Lindl.) and cedar (Libocedrus bidwillii Hook. F.)." Thesis, University of Canterbury. Department of Geological Sciences, 2014. http://hdl.handle.net/10092/9027.

Full text
Abstract:
This thesis presents research that improves our understanding of the relationship between climate and tree-ring stable isotopes in New Zealand kauri (Agathis australis (D. Don) Lindl.) and cedar (Libocedrus bidwillii Hook. F). As a whole, this research creates a framework from which future investigations of stable isotope dendroclimatology can pursued at high temporal resolution across longer term temporal intervals. Such a framework is required to realize the full potential of New Zealand tree-ring records as archives of palaeoclimatic information. In the Southern Hemisphere, mid-to-high lati
APA, Harvard, Vancouver, ISO, and other styles
44

Deng, Jia, Carmody K. McCalley, Steve Frolking, et al. "Adding stable carbon isotopes improves model representation of the role of microbial communities in peatland methane cycling." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/625198.

Full text
Abstract:
Climate change is expected to have significant and uncertain impacts on methane (CH4) emissions from northern peatlands. Biogeochemical models can extrapolate site-specificCH(4) measurements to larger scales and predict responses of CH4 emissions to environmental changes. However, these models include considerable uncertainties and limitations in representing CH4 production, consumption, and transport processes. To improve predictions of CH4 transformations, we incorporated acetate and stable carbon (C) isotopic dynamics associated with CH4 cycling into a biogeochemistry model, DNDC. By includ
APA, Harvard, Vancouver, ISO, and other styles
45

Potter, Elyn. "Changes in stable carbon isotopes of methane along a salinity gradient in a hypersaline microbial mat system." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5089.

Full text
Abstract:
Thesis (M.S.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on November 1, 2007) Includes bibliographical references.
APA, Harvard, Vancouver, ISO, and other styles
46

Rocheford, MaryKathryn. "An early to middle Holocene carbon isotope and phytolith record from the Sac Valley Archaeological District, southwest Missouri." Thesis, University of Iowa, 2009. https://ir.uiowa.edu/etd/425.

Full text
Abstract:
New pedologic, carbon isotope and phytolith analyses along with stratigraphic correlations to nearby archaeological sites record the spatial and temporal distribution of past vegetation patterns in the Sac Valley Archaeological District of southwest Missouri. Radiocarbon ages obtained from a soil core along Bear Creek, CB5, are related to those from Hajic et al. (1998, 2000) indicating that the CB5 location contains correlative middle Rodgers Shelter submember deposits. This relationship also indicates that sedimentation was approximately two times greater at the CB5 locality than at the Big E
APA, Harvard, Vancouver, ISO, and other styles
47

Padgett, Abbey E. "Early-Middle Holocene Cultural and Climate Shifts in NW Africa: Paleoenvironmental Reconstruction Using Stable Isotopes of Land Snail Shells." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522318834405742.

Full text
APA, Harvard, Vancouver, ISO, and other styles
48

Tuerena, Robyn Elizabeth. "Nitrogen and carbon cycling in the South Atlantic Ocean : a stable isotope study along a 40°S transect (UK GEOTRACES)." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10443.

Full text
Abstract:
Fixed N (nitrate, nitrite, and ammonium) is a limiting nutrient for photosynthesis in the surface ocean. The rates and relative importance of N cycling processes, however, are temporally and spatially complex, which hamper their direct measurement and quantification. The South Atlantic subtropical front separates the Atlantic Ocean and the subantarctic, an area which can elucidate information about water masses both entering and leaving the basin. Through the GEOTRACES programme, an oceanographic section across 40°S in the South Atlantic is used to investigate biogeochemical cycling of nitroge
APA, Harvard, Vancouver, ISO, and other styles
49

Venkiteswaran, Jason James. "A process-based stable isotope approach to carbon-cycling in recently flooded upland boreal forest reservoirs." Waterloo, Ont. : University of Waterloo, [Dept. of Earth Science], 2002. http://etd.uwaterloo.ca/etd/jjvenkiteswaran2002.pdf.

Full text
Abstract:
Thesis (M.Sc.) - University of Waterloo, 2002.<br>"A thesis presented to the University of Waterloo in fulfillment of the thesis requirements for the degree of Master of Science in Earth Sciences". Includes bibliographical references.
APA, Harvard, Vancouver, ISO, and other styles
50

Venkiteswaran, Jason. "A process-based stable isotope approach to carbon cycling in recently flooded upland boreal forest reservoirs." Thesis, University of Waterloo, 2002. http://hdl.handle.net/10012/1238.

Full text
Abstract:
Reservoirs impound and store large volumes of water and flood land. The water is used for electricity generation, irrigation, industrial and municipal consumption, flood control and to improve navigation. The decomposition of flooded soil and vegetation creates greenhouse gases and thus reservoirs are a source of greenhouse gases. Reservoirs are not well studied for greenhouse gas flux from the water to the atmosphere. The FLooded Upland Dynamics EXperiment (FLUDEX) involves the creation of three experimental reservoirs in the upland boreal forest to study greenhouse gas and mercur
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!