Chemical and Biogeochemical Processes at Methane and Other Cold Seeps - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Chemical and Biogeochemical Processes at Methane and Other Cold Seeps write by Davide Oppo. This book was released on 2023-10-31. Chemical and Biogeochemical Processes at Methane and Other Cold Seeps available in PDF, EPUB and Kindle. Methane is a strong climate-active gas, the concentration of which is rapidly increasing in the atmosphere. Vast methane reservoirs are hosted in seafloor sediments, both dissolved in pore fluids and trapped in gas hydrate. Cold seeps discharge significant amounts of this methane into the ocean. The rate of seabed methane discharge could be orders of magnitude higher than current estimates, creating considerable uncertainty. The extent of methane transfer from the seafloor to the water column and ultimately to the atmosphere is also uncertain. The seepage of methane and other hydrocarbons drives complex biogeochemical processes in marine sediments and the overlying water column. Seeps support chemosynthesis-based communities and impact the chemistry of the water column. Seeps may also play a critical role in ocean acidification and deoxygenation and can be geohazards, as well as a potential energy resource. Unraveling the complex and dynamic interactions and processes at marine seeps is crucial for our understanding of element cycling in the geo- and hydrosphere.
Methane Fluxes and Associated Biogeochemical Processes in Cold Seep Ecosystems
Methane Fluxes and Associated Biogeochemical Processes in Cold Seep Ecosystems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Methane Fluxes and Associated Biogeochemical Processes in Cold Seep Ecosystems write by Janine Felden. This book was released on 2009. Methane Fluxes and Associated Biogeochemical Processes in Cold Seep Ecosystems available in PDF, EPUB and Kindle. During this PhD study, methane efflux and consumption as well as related processes such as sulfate reduction were investigated at four different deep-sea cold seeps. The main focus was on in situ quantification of methane emission and oxygen consumption. The results showed that cold seeps are spatially heterogeneous ecosystems, which are controlled by variations of fluid flow intensity influencing benthic biogeochemical processes. The highest fluid flow velocities are found at the central outflow of mud volcanoes in combination with high methane emission but low methane consumption rates. Outside of these main emission sites, chemosynthetic organisms such as matforming thiotrophic bacteria or siboglinid tubeworms are observed. Here, medium to low fluid flow velocities with high methane oxidation and high sulfate reduction rates were measured. Within one seep ecosystem there are spatial variations in methane emission and consumption, but the benthic biological methane filter of the different seep habitats removes a significant fraction of the total methane flow (up to 90 %). For the methane budgets of geostructures and ocean basins, diffusive methane effluxes were previously not considered. However, based on the obtained data during this PhD study, diffusive methane discharge contributes significantly to the total methane emission. Considering the diffusive methane release of the investigated deep-sea mud volcanoes, only mud volcanoes would release up to 15 x 1012 g methane per year to the water column, which is a significant fraction of the total annual methane flux from the ocean to the atmosphere.
Geobiology of Ancient and Modern Methane-seeps
Geobiology of Ancient and Modern Methane-seeps - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Geobiology of Ancient and Modern Methane-seeps write by Jörn Peckmann. This book was released on 2005. Geobiology of Ancient and Modern Methane-seeps available in PDF, EPUB and Kindle.
Systems Biogeochemistry of Major Marine Biomes
Systems Biogeochemistry of Major Marine Biomes - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Systems Biogeochemistry of Major Marine Biomes write by Aninda Mazumdar. This book was released on 2022-04-12. Systems Biogeochemistry of Major Marine Biomes available in PDF, EPUB and Kindle. Systems Biogeochemistry of Major Marine Biomes A comprehensive system-level discussion of the geomicrobiology of the Earth’s oceans In Systems Biogeochemistry of Major Marine Biomes, a team of distinguished researchers delivers a systemic overview of biogeochemistry across a number of major physiographies of the global ocean: the waters and sediments overlying continental margins; the deep sub-surfaces; the Arctic and Antarctic oceans; and the physicochemical extremes such as the hypersaline and sulfidic marine zones, cold methane seeps and hydrothermal ecosystems. The book explores state-of-the-art advances in marine geomicrobiology and investigates the drivers of biogeochemical processes. It highlights the imperatives of the unique, fringe, and cryptic processes while studying the geological manifestations and ecological feedbacks of in situ microbial metabolisms. Taking a holistic approach toward the understanding of marine biogeochemical provinces, this book emphasizes the centrality of culture-dependent and culture-independent (meta-omics-based) microbiological information within a systems biogeochemistry framework. Perfect for researchers and scientists in the fields of geochemistry, geophysics, geomicrobiology, oceanography, and marine science, Systems Biogeochemistry of Major Marine Biomes will also earn a place in the libraries of policymakers and advanced graduate students seeking a one-stop reference on marine biogeochemistry.
Biogeochemistry of Marine Systems
Biogeochemistry of Marine Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Biogeochemistry of Marine Systems write by Kenneth D. Black. This book was released on 2009-02-12. Biogeochemistry of Marine Systems available in PDF, EPUB and Kindle. Marine systems vary in their sensitivities to perturbation.Perturbation may be insidious – such as increasingeutrophication of coastal areas – or it may be dramatic– such as a response to an oil spillage or some otheraccident. Climate change may occur incrementally or it may beabrupt, and ecosystem resilience is likely to be a complex functionof the interactions of those assemblages or species mediating keybiogeochemical processes. Biogeochemistry of Marine Systems considers issues ofmarine system resilience, focusing on a range of marine systemsthat exemplify major global province types but are also interestingand topical in their own right, on account of their sensitivity tonatural or anthropogenic change or their importance as ecologicalservice providers. Authors concentrate on advances of the lastdecade.
