Download or read book Organic Carbon and Nitrogen Concentrations and Stable Isotopic Ratios of Organic Carbon in the Miocene Pungo River Formation North Carolina Continental Shelf written by Mary Emily Maxwell and published by . This book was released on 1990 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Upper Cenozoic Geology of the Onslow Bay and Aurora Embayments North Carolina written by Stanley R. Riggs and published by . This book was released on 1992 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Authigenesis written by Craig R. Glenn and published by . This book was released on 2000 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon and Nitrogen Concentrations and Annual Organic Carbon Load of Six Selected Rivers of the United States written by R. L. Malcolm and published by . This book was released on 1976 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphic and Structural Setting of the Middle Miocene Pungo River Formation of North Carolina written by James Anderson Miller and published by . This book was released on 1971 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon and Nitrogen Concentrations and Annual Organic Carbon Load of Six Selected Rivers of the United States written by Geological Survey (U.S.) and published by . This book was released on 1965 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Miocene Geology of the Continental Shelf Onslow Bay North Carolina written by North Carolina. Geological Survey Section and published by . This book was released on 1993 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon and Nitrogen Concentrations and Annual Organic Carbon Load of Six Selected Rivers of the United States written by Ronald L. Malcolm and published by . This book was released on 1976 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon and Nitrogen Concentrations and Annual Organic Carbon Load of Six Selected Rivers of the United States written by Ronald L. Malcolm and published by . This book was released on 1976 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon in Amazon Continental Shelf Sediments written by David Gerald Angle and published by . This book was released on 1985 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon Stable Isotope Ratios of Continental Margin Sediments written by Patrick James Gearing and published by . This book was released on 1975 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Carbon and Nitrogen Concentrations and Annual Organic Carbon Load of the United States written by Ronald L. Malcolm and published by . This book was released on 1976 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deposition and Fate of Modern Organic Carbon in Shelf upper Slope Sediments Near Cape Hatteras North Carolina Final Report written by and published by . This book was released on 1998 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissolved Organic Carbon Concentrations and Isotope Ratios in the Northeast Pacific Ocean written by Steven Robert Beaupré and published by . This book was released on 2007 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolved organic carbon (DOC) is an important component of the oceanic carbon cycle. However, the molecular and isotopic compositions, and biogeochemical processes that act upon it are largely unresolved due to methodological difficulties and limited observations. This study developed an improved low-blank UV-oxidation system for concentration and Delta 14C characterization of marine DOC.
Download or read book Organic Matter Sources Transformations and Fates in Northern High Latitude Regions on the Forefront of Climate Change written by Megan Irene Behnke and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change is dramatically altering the global carbon cycle. The warming caused by climate change is approximately twice the global average in Arctic and contiguous northern high-latitude regions, which are thus especially susceptible to ecosystem shifts (e.g. permafrost thaw, wetland drying/wetting cycle exacerbation). Rivers process and transport organic matter (OM) from land where warming is destabilizing previously stabilized carbon stocks to the ocean. This dissertation examines how fluvial OM in northern high latitudes responds to climate change, and how the fate of such OM may influence the global carbon cycle. Specifically, it focuses on how the source and processing of dissolved and particulate organic matter (DOM and POM) interact to dictate OM fate. To do so, Fourier-transform ion cyclotron resonance mass spectrometry, carbon isotopes ([capital delta]14C, [small delta]13C), and data on OM concentrations and carbon to nitrogen (C:N) ratios are used. Across the pan-Arctic (Chapters 2 and 3) and northeast Pacific coastal temperate rainforest (NPCTR; Chapters 4 and 5), sources appear to influence the fate of DOM (Chapters 2, 4, and 5) and POM (Chapter 3). Both landscape-scale factors like permafrost or agricultural extent (Chapters 2 and 3) and watershed slope and wetland extent (Chapters 3, 4, and 5), as well as specific source types like tree canopy or bark and soil layer (Chapters 4 and 5) impact OM molecular, isotopic, and elemental compositions and thus processing. Further, seasonality varies between the pan-Arctic watershed (Chapters 2 and 3) and the NPCTR (Chapters 4 and 5), leading to differential timing of the strongest terrestrial carbon source impacts on the system.In large pan-Arctic rivers, spring freshet contains DOM primarily sourced from terrestrial material but also includes a latent high-energy subsidy that explains the historical paradox of freshet DOM's bulk terrestrial composition but apparent high biolability. Winter riverine DOM is mostly sourced from old, microbially degraded groundwater DOM. This work uncovered a stable core Arctic riverine fingerprint (CARF) present in all samples from six years. The CARF may contribute to a carbon sink of aged DOM that appears to persist in the global ocean. Further, this dissertation uses a decade of compositional data on POM to untangle multiple allochthonous and autochthonous pan-Arctic and watershed-specific POM endmembers sourced from literature (for the full list of literature values used in endmembers, see supplementary file "Table B5.csv"). The three tracers used (C:N ratio, [small delta]13C, and [capital delta]14C) appear to reveal a substantial, previously overlooked aquatic biomass signal in POM (~53% of the annual pan-Arctic POM flux which averages 4391 Gg/y of exported particulate organic carbon). Splitting soil endmember values into shallow and deep soil pools (mean [plus or minus] standard deviation: -228 [plus or minus] 211 volume -492 [plus or minus] 173%) rather than the less representative traditional active layer and permafrost categories (-300 ± 236 volume -441 ± 215‰) also improved endmember resolution. In the NPCTR, dissolved organic carbon concentrations as high as 167 mgCL-1 were found in tree DOM (which proved highly biolabile in this study; >50%). Since the NPCTR is hypermaritime, tree DOM fluxes may be substantial. Condensed aromatic formulae comprised as much as 38% relative abundance of spruce and hemlock bark leachate DOM. Coniferous trees could thus be major condensed aromatic sources. Soil wetness determined DOM composition and response to microbial processing. Source-specific marker formulae were discovered in multiple soil and tree sources, and though the majority were consumed during bioincubations certain marker formulae persisted. All of these source-specific marker formulae (of which >90% were from spruce stemflow) were then located downstream in the watershed demonstrating that tree DOM may escape biodegradation. Summertime in the NPCTR yields the most terrestrial DOM, which then appears to degrade during the colder, wetter, fall-spring period. Despite these seasonal trends two metrics of fresh terrestrial DOM contribution (marker formulae and modified aromaticity index) did not show any significant relationships with hydrologic or temperature variables. Antecedent conditions (rather than precipitation alone) thus seems to control molecular terrestrial connectivity. Climate change is modifying both the sources and seasons that this dissertation shows to influence DOM composition and fate in northern regions. Increasing precipitation intensity in the NPCTR may tighten land-ocean linkages, while warming, permafrost thaw, and increasing CO2 concentrations could enhance allochthonous and autochthonous POM fluxes and the contribution of old, microbially processed, stable DOM to the Arctic Ocean. This work shows that an improved understanding of current controls on OM composition and fate will be necessary to predict future changes in northern high-latitude ecosystem carbon cycling and its role in furthering global climate change.
Download or read book Temporal Variability in the Concentration and Stable Carbon Isotope Composition of Dissolved Inorganic and Organic Carbon in Two Montana USA Rivers written by Stephen R. Parker and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Petrology of the Pungo River Formation Central Coastal Plain of North Carolina written by A. Kelly Scarborough and published by . This book was released on 1981 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
