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Isotopic Constraints On The Sources And Associations Of Organic Compounds In Marine Sediments
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Book Synopsis Isotopic Constraints on the Sources and Associations of Organic Compounds in Marine Sediments by :
Download or read book Isotopic Constraints on the Sources and Associations of Organic Compounds in Marine Sediments written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2006.
Book Synopsis Isotopic Constraints on the Sources and Associations of Organic Compounds in Marine Sediments by : Helen K. White
Download or read book Isotopic Constraints on the Sources and Associations of Organic Compounds in Marine Sediments written by Helen K. White and published by . This book was released on 2006 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) Finally, the persistence of n-alkanes from biogenic sources compared to those derived from petroleum indicates that protective matrix association can play a crucial role in determining the long-term fate of a compound. Overall, it is clear that both natural organic compounds and HOCs can undergo very different fates depending on their mode of introduction to, and physical disposition in environmental matrices.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Report by : Woods Hole Oceanographic Institution
Download or read book Annual Report written by Woods Hole Oceanographic Institution and published by . This book was released on 2006 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotopic and Molecular Indicators of Origins of Organic Compounds in Sediments by : Ray Takigiku
Download or read book Isotopic and Molecular Indicators of Origins of Organic Compounds in Sediments written by Ray Takigiku and published by . This book was released on 1987 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Treatise on Estuarine and Coastal Science by :
Download or read book Treatise on Estuarine and Coastal Science written by and published by Academic Press. This book was released on 2012-03-06 with total page 4604 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of estuaries and coasts has seen enormous growth in recent years, since changes in these areas have a large effect on the food chain, as well as on the physics and chemistry of the ocean. As the coasts and river banks around the world become more densely populated, the pressure on these ecosystems intensifies, putting a new focus on environmental, socio-economic and policy issues. Written by a team of international expert scientists, under the guidance of Chief Editors Eric Wolanski and Donald McClusky, the Treatise on Estuarine and Coastal Science, Ten Volume Set examines topics in depth, and aims to provide a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Most up-to-date reference for system-based coastal and estuarine science and management, from the inland watershed to the ocean shelf Chief editors have assembled a world-class team of volume editors and contributing authors Approach focuses on the physical, biological, chemistry, ecosystem, human, ecological and economics processes, to show how to best use multidisciplinary science to ensure earth's sustainability Provides a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Features up-to-date chapters covering a full range of topics
Book Synopsis Biogeochemistry of Marine Dissolved Organic Matter by : Dennis A. Hansell
Download or read book Biogeochemistry of Marine Dissolved Organic Matter written by Dennis A. Hansell and published by Academic Press. This book was released on 2014-10-02 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine dissolved organic matter (DOM) is a complex mixture of molecules found throughout the world's oceans. It plays a key role in the export, distribution, and sequestration of carbon in the oceanic water column, posited to be a source of atmospheric climate regulation. Biogeochemistry of Marine Dissolved Organic Matter, Second Edition, focuses on the chemical constituents of DOM and its biogeochemical, biological, and ecological significance in the global ocean, and provides a single, unique source for the references, information, and informed judgments of the community of marine biogeochemists. Presented by some of the world's leading scientists, this revised edition reports on the major advances in this area and includes new chapters covering the role of DOM in ancient ocean carbon cycles, the long term stability of marine DOM, the biophysical dynamics of DOM, fluvial DOM qualities and fate, and the Mediterranean Sea. Biogeochemistry of Marine Dissolved Organic Matter, Second Edition, is an extremely useful resource that helps people interested in the largest pool of active carbon on the planet (DOC) get a firm grounding on the general paradigms and many of the relevant references on this topic. Features up-to-date knowledge of DOM, including five new chapters The only published work to synthesize recent research on dissolved organic carbon in the Mediterranean Sea Includes chapters that address inputs from freshwater terrestrial DOM
Book Synopsis Natural Sulfurization of Carbohydrates in Marine Sediments by : Bart Egidius van Dongen
Download or read book Natural Sulfurization of Carbohydrates in Marine Sediments written by Bart Egidius van Dongen and published by . This book was released on 2003 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotopic Studies in Cretaceous Research by : A.-V. Bojar
Download or read book Isotopic Studies in Cretaceous Research written by A.-V. Bojar and published by Geological Society of London. This book was released on 2014-01-24 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Isotopic studies combined with geochemical, lithological, mineralogical and palaeontological investigations have been widely used in reconstructing Cretaceous marine and continental environments. Furthermore stable and radiogenic isotope trends play an important role in the interpretation of the causes and consequences of biotic turnovers at stratigraphic boundaries as well as in global correlations.
Book Synopsis New Publications of the Geological Survey by : Geological Survey (U.S.)
Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1988 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compilation of Minimum and Maximum Isotope Ratios of Selected Elements in Naturally Occurring Terrestrial Materials and Reagents by : Tyler B. Coplen
Download or read book Compilation of Minimum and Maximum Isotope Ratios of Selected Elements in Naturally Occurring Terrestrial Materials and Reagents written by Tyler B. Coplen and published by . This book was released on 2002 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Documented variations in the isotopic compositions of some chemical elements are responsible for expanded uncertainties in the standard atomic weights published by the Commission on Atomic Weights and Isotopic Abundances of the International Union of Pure and Applied Chemistry. This report summarizes reported variations in the isotopic compositions of 20 elements that are due to physical and chemical fractionation processes (not due to radioactive decay) and their effects on the standard atomic weight uncertainties. For 11 of those elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, silicon, sulfur, chlorine, copper, and selenium), standard atomic weight uncertainties have been assigned values that are substantially larger than analytical uncertainties because of common isotope abundance variations in materials of natural terrestrial origin. For 2 elements (chromium and thallium), recently reported isotope abundance variations potentially are large enough to result in future expansion of their atomic weight uncertainties. For 7 elements (magnesium, calcium, iron, zinc, molybdenum, palladium, and tellurium), documented isotope-abundance variations in materials of natural terrestrial origin are too small to have a significant effect on their standard atomic weight uncertainties.
Book Synopsis Preliminary Investigations of the Association of Organic Material and Carbon Dioxide with Sedimentary Particles by : James B. Smith
Download or read book Preliminary Investigations of the Association of Organic Material and Carbon Dioxide with Sedimentary Particles written by James B. Smith and published by . This book was released on 1961 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: The removal of dissolved organic compounds and carbon dioxide from sea water by sedimentary minerals and the subsequent incorporation of both in sedimentary deposits are determined by various environmental factors. The laboratory experiments discussed in this report were devised so as to permit consideration of the effect of type of organic compound, solution concentration, mineralogy, pH, chlorinity, mineral settling rate and temperature on the mineral-organic association in aqueous systems. The investigation was conducted by radiometric analysis with the use of dl-alanine, glycine, aspartic acid, oxalic acid, succinic acid, fructose, glucose ad sucrose, all known to occur in natural waters and deposits. These organic compounds were spiked with their carbon-14 counterpart. The carbon dioxide phase was accomplished in a like manner with the use of spiked carbon-14 dioxide. The minerals under investigation were montmorillonite, illite, kaolinite and quartz, all commonly found in marine deposits. It has been demonstrated that the association of amino acids, dibasic acids and carbohydrates with minerals is primarily dependent upon the molecular weight, structure and functional groups of the compounds as well as upon the available surface area and surface "activity" of the mineral. Impressed on these principal variables are pH, chlorinity and temperature of the system. The total phenomena observed in these experiments can best be explained by the formation of a complex clay-organic gel. The data cannot be explained on the basis of a physical phenomenon alone, and it appears that the triggering for the mechanism forming the complex gel is in part physical and chemical as related to both the organic compound and the mineral. Once the initial system is formed, the growing particles may act as a molecular sieve capable of continuously removing organic material from solution during the settling process
Book Synopsis Isotopic Investigations of Modern Ferromanganese and Pennsylvanian Carbonate Marine Sediments by : William Frederick Sangrey
Download or read book Isotopic Investigations of Modern Ferromanganese and Pennsylvanian Carbonate Marine Sediments written by William Frederick Sangrey and published by . This book was released on 1994 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biogeochemical Applications of Compound-specific Radiocarbon Analysis by : Ann Pearson
Download or read book Biogeochemical Applications of Compound-specific Radiocarbon Analysis written by Ann Pearson and published by . This book was released on 2000 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compound-specific carbon isotopic (delta 13C and delta 14C) data are reported for lipid biomarkers isolated from Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) surface sediments. These organic compounds represent phytoplanktonic, zooplanktonic, bacterial, archaeal, terrestrial, and fossil carbon sources. The lipids include long-chain n-alkanes, fatty acids (as FAMEs), n-alcohols, C(30) mid-chain ketols and diols, sterols, hopanols, and ether-linked C(40)-biphytanes of Archaca. The data show that the carbon source for most of the biomarkers is marine euphotic zone primary production or subsequent heterotrophic consumption of this biomass. Two lipid classes represent exceptions to this finding. Delta 14C values for the n-alkanes are consistent with mixed fossil and contemporary terrestrial plant sources. The archaeal isoprenoid data reflect chemoautotrophic growth below the euphotic zone. The biomarker class most clearly representing marine phytoplanktonic production is the sterols. It is suggested, therefore, that the sterols could serve as paleoceanographic tracers for surface-water DIC. The isotopic data are used to construct two algebraic models. The first calculates the contributions of fossil and modern vascular plant carbon to SMB n-alkanes. This model indicates that the delta 14C of the modern component is +235% (post-bomb) or 0% (pre-bomb). The second model uses these values to determine the origin of sedimentary TOC. The results are comparable to estimates based on other approaches and suggest that approx. 60% of SMB TOC is of marine origin, modern terrestrial and fossil sources contribute approx. 10% each, and the remaining approx. 20% is of unknown origin.
Book Synopsis Chemical and isotopic composition of marine organic matter as indicators of its origin by : Alenka Malej
Download or read book Chemical and isotopic composition of marine organic matter as indicators of its origin written by Alenka Malej and published by . This book was released on 1988 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Identification of the origin of arganic matter (OM) in the nearshore environments poses a major problem for marine scientists. No simple means exists for separation of autochtonus marine and terrestrially derived organic material. Recently, the use of multiple source indicators, especially stable isotopes, has given a valuable information about biogeochemistry of OM in particular areas. A combination of stable C isotopic measurments and C/N ratios was used to obtain the information about the sources of the OM in the water column and surficial sediments in the Gulf of Trieste (Northern Adriatic) ...
Book Synopsis U.S. Geological Survey Bulletin by :
Download or read book U.S. Geological Survey Bulletin written by and published by . This book was released on 1983 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
