Download or read book A Biomarker and Carbon Isotopic Study of Organic rich Marine Sediments from Two Cainozoic Climate Optima written by Catherine A. Johnson and published by . This book was released on 1996 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Controls on the Distribution and Carbon Isotopic Composition of Archaeal Biomarkers in Organic rich and Methanogenic Marine Sediments written by and published by . This book was released on 2004 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accumulation of Organic Carbon in Marine Sediments written by Ruediger Stein and published by . This book was released on 2014-01-15 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Carbon Cycling in the Glacial Ocean Constraints on the Ocean s Role in Global Change written by Rainer Zahn and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive progress report on the multi-disciplinary field of ocean and climate change research is given. It compiles introductory background papers and leading scientific results on the ocean-atmosphere carbon cycle with emphasis on the ocean's carbon inventory and the various components involved. The relationship between plankton productivity, carbon fixation, oceanic PCO2 and climate change is investigated from the viewpoint of long-term climatic change during the late Quaternary cycles of ice ages and warm ages. The various approaches range from micropaleontology over organic and trace element geochemistry to molecular isotope geochemistry.
Download or read book Accumulation of Organic Carbon in Marine Sediments written by Ruediger Stein and published by Springer. This book was released on 1991 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Carbon Isotope Biogeochemistry of Epsilon Co2 Production in a Methanogenic Marine Sediment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-13 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: To investigate the relationship between sigma(CO2) delta(C-13) values and rates of the dominant remineralization processes at the organic-rich field site of Cape Lookout Bight, NC, the isotopic composition of porewater sigma(CO2) was measured on a seasonal basis. The sigma(CO2) delta(C-13) values varies seasonally in response to changes in rates of sulfate reduction and methanogenesis, the dominant remineralization processes at this site. A tube incubation experiment was also performed to determine the isotopic signature of the sigma(CO2) produced by sulfate reduction and methanogenesis. The delta(C-13) of the sigma(CO2) produced in the sulfate reduction zone determined from the tube incubation was -14.3 plus or minus 1.9, a value enriched in C-13 relative to the labile organic fraction. The C-13-enrichment may be caused by low rates of methanogenesis occurring in the sulfate reduction zone. The delta(C-13) of the sigma(CO2) produced in the methanogenic zone was estimated to be +44 per mil, whereas the co-produced methane was -65 per mil. The fractionation factor for CO2 reduction was calculated to be 1.055, a value in agreement with previous estimates at this site. The measured concentration and delta(C-13) of the sigma(CO2) at Cape Lookout was closely reproduced by a diagenetic model using the measured rates of sulfate reduction and sigma(CO2) production, and the isotopic signature of the sigma(CO2) production in the two biogeochemical zones. Boehme, Susan E. Unspecified Center ...
Download or read book An Organic and Isotopic Geochemical Study of Santa Monica Basin Sediments Offshore California written by Changrui Gong and published by . This book was released on 1998 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transfer of carbon from atmosphere to the ocean and from the ocean to the sediments constitutes a very important part of the global biogeochemical cycle of carbon that has potential influence on the Earth's climate system. Understanding the burial mechanisms of organic carbon, and the link between sedimentary organic geochemistry and water column processes become imperative if we want to better interpret past environmental changes from the sedimentary rock records and to better predict the potential changes in future climate.
Download or read book Ocean Biogeochemistry written by Michael J.R. Fasham and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oceans account for 50% of the anthropogenic CO2 released into the atmosphere. During the past 15 years an international programme, the Joint Global Ocean Flux Study (JGOFS), has been studying the ocean carbon cycle to quantify and model the biological and physical processes whereby CO2 is pumped from the ocean's surface to the depths of the ocean, where it can remain for hundreds of years. This project is one of the largest multi-disciplinary studies of the oceans ever carried out and this book synthesises the results. It covers all aspects of the topic ranging from air-sea exchange with CO2, the role of physical mixing, the uptake of CO2 by marine algae, the fluxes of carbon and nitrogen through the marine food chain to the subsequent export of carbon to the depths of the ocean. Special emphasis is laid on predicting future climatic change.
Download or read book Carbon Cycling in the Glacial Ocean written by Rainer Zahn and published by Springer. This book was released on 1994 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indicators and Tracers of Ocean Chemistry Change Over the Pleistocene written by Rachel Oxburgh and published by . This book was released on 1996 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book The Carbon and Nitrogen Isotopic Biogeochemistry of the Organic rich Lacustrine Sediments of the Green River Formation written by James William Collister and published by . This book was released on 1989 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbial and Chemical Studies in Anaerobic Marine Sediments written by Donna Rich and published by . This book was released on 1979 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biochemistry of Lipids in Recent Organic rich Marine Sediments written by Dedric Jonathan Smith and published by . This book was released on 1984 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Carbon Cycle in an Anoxic Marine Sediment written by Marc J. Alperin and published by . This book was released on 1989 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Carbon Isotope Mass Balance for an Anoxic Marine Sediment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A carbon isotope mass balance was determined for the sediments of Cape Lookout Bight, NC to constrain the carbon budgets published previously. The diffusive, ebullitive and burial fluxes of sigma CO2 and CH4, as well as the carbon isotope signatures of these fluxes, were measured. The flux-weighted isotopic signature of the remineralized carbon (-18.9 plus or minus 2.7 per mil) agreed with the isotopic composition of the remineralized organic carbon determined from the particulate organic carbon (POC) delta(C-13) profiles (-19.2 plus or minus 0.2), verifying the flux and isotopic signature estimates. The measured delta(C-13) values of the sigma CO2 and CH4 diffusive fluxes were significantly different from those calculated from porewater gradients. The differences appear to be influenced by methane oxidation at the sediment-water interface, although other potential processes cannot be excluded. The isotope mass balance provides important information concerning the locations of potential diagenetic isotope effects. Specifically, the absence of downcore change in the delta(C-13) value of the POC fraction and the identical isotopic composition of the POC and the products of remineralization indicate that no isotopic fractionation is expressed during the initial breakdown of the POC, despite its isotopically heterogeneous composition. Boehme, Susan E. Unspecified Center ...
