The Lifetime of Methane Bubbles Through Sediment and Water Column
Author: Regina Katsman
Publisher: Frontiers Media SA
Published: 2022-09-21
Total Pages: 239
ISBN-13: 2832500153
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Author: Regina Katsman
Publisher: Frontiers Media SA
Published: 2022-09-21
Total Pages: 239
ISBN-13: 2832500153
DOWNLOAD EBOOKAuthor: Peter U. Clark
Publisher: DIANE Publishing
Published: 2009-09
Total Pages: 258
ISBN-13: 1437915698
DOWNLOAD EBOOKThis report is part of a series of 21 Synthesis and Assessments (SAP) aimed at providing current assessments of climate change science to inform public debate, policy, and operational decisions. These reports are also intended to help develop future program research priorities. The guiding vision is to provide the Nation and the global community with the science-based knowledge needed to manage the risks and capture the opportunities associated with climate and related environmental changes. This SAP assesses abrupt climate change events where key aspects of the climate system change faster than the responsible forces would suggest and/or faster than society can respond to those changes. Illustrations.
Author: Andrew S. Johnson (Lieutenant)
Publisher:
Published: 2019
Total Pages: 131
ISBN-13:
DOWNLOAD EBOOKMethane (CH4) is a potent greenhouse gas that is often found in a solid, hydrate clathrate form in marine sediments along continental margins and will often escape from the seafloor and rise through the water column as bubbles. The estimated marine methane hydrate inventory is over 600 times greater than the current atmospheric concentration so the fate of this ebullitive methane flux is of great interest. Traditional methods of measuring this flux such as acoustic imaging, optical sensors, and modeling suffer from limited information regarding the bubbles’ composition. Studies that attempt to constrain CH4 bubble composition suffer from low spatiotemporal resolution and adaptability. The current study presents the design, development and deployment of a novel, in situ bubble sampling system, the Bubble Delivery System (BDS), to quantify gas chemical composition in the water column. The BDS was deployed at the Cascadia Margin – a region well known for its active CH4 bubble seeps – where 95 samples were collected from McArthur Ridge, Hydrate Ridge, Heceta Deep and Heceta Shallow over the course of seven remotely operated vehicle dives. By combining this approach with the use of an underwater mass spectrometer, in situ analysis of these samples indicated that the bubbles contained between 84.6 to 100% CH4 and exhibited a high level of variability both spatially and temporally. Bubbles emitted from Heceta Deep exhibited anomalously elevated levels of carbon dioxide compared to the other sites.
Author: Benjamin Paul Scandella
Publisher:
Published: 2010
Total Pages: 96
ISBN-13:
DOWNLOAD EBOOKThe dynamics of methane transport in lake sediments control the release of methane into the water column above, and the portion that reaches the atmosphere may contribute significantly to the greenhouse effect. The observed dynamics are poorly understood. In particular, variations in the hydrostatic load on the sediments, from both water level and barometric pressure, appear to trigger free gas bubbling (ebullition). We develop a model of methane bubble ow through the sediments, forced by changes in hydrostatic load. The mechanistic, numerical model is tuned to and compared against ebullition data from Upper Mystic Lake, MA, and the predictions match the daily temporal character of the observed gas releases. We conclude that the combination of plastic gas cavity deformation and ow through "breathing" gas conduits explains methane venting from lake sediments. This research lays the groundwork for integrated modeling of methane transport in the sediment and water column to constrain the atmospheric flux from methane-generating lakes.
Author: Vivien Gornitz
Publisher: Springer Science & Business Media
Published: 2008-10-31
Total Pages: 1062
ISBN-13: 1402045514
DOWNLOAD EBOOKOne of Springer’s Major Reference Works, this book gives the reader a truly global perspective. It is the first major reference work in its field. Paleoclimate topics covered in the encyclopedia give the reader the capability to place the observations of recent global warming in the context of longer-term natural climate fluctuations. Significant elements of the encyclopedia include recent developments in paleoclimate modeling, paleo-ocean circulation, as well as the influence of geological processes and biological feedbacks on global climate change. The encyclopedia gives the reader an entry point into the literature on these and many other groundbreaking topics.
Author: Tatiana Chaplina
Publisher: Springer Nature
Published: 2021-04-26
Total Pages: 305
ISBN-13: 3030690407
DOWNLOAD EBOOKThis book presents the findings of recent theoretical and experimental studies of processes in the atmosphere, oceans and lithosphere, discussing their interactions, environmental issues, geology, problems related to human impacts on the environment, and methods of geophysical research. It particularly focuses on the geomechanical aspects of the production of hydrocarbons, including the laborious extraction of oils. Furthermore, it includes contributions on ecological problems of the biosphere. This book corresponds to the English edition of the "Processes in GeoMedia," a Russian academic journal focused on new theoretical and experimental studies of the Earth's processes.
Author: Harry James Simpson
Publisher:
Published: 1979
Total Pages: 228
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1979
Total Pages: 228
ISBN-13:
DOWNLOAD EBOOKAuthor: Fabio Menna
Publisher: MDPI
Published: 2018-09-28
Total Pages: 389
ISBN-13: 3038422223
DOWNLOAD EBOOKThis book is a printed edition of the Special Issue "Sensors and Techniques for 3D Object Modeling in Underwater Environments" that was published in Sensors