OS24C:
Seafloor Hydrocarbon Seepage and Venting: The Contributions and Impacts to the Hydrosphere, Atmosphere, and Seep Habitat Biosphere I


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Session ID#: 57589

Session Description:
Hydrocarbons escaping from the seafloor can have profound impacts on the marine environment. This session aims to collect examples of hydrocarbon seepage in any form including methane from gas hydrate fields or oil from thermogenic hydrocarbon resource fields, for areas from coastal, nearshore to deep continental slopes, from fast changing geographic regions like the Arctic to continental margins. Recent and ongoing programs in seafloor mapping reveal the vast diversity of (in)active seeps either as bubble streams in the water column or high backscatter intensity from carbonates. Repeat measurements or continuous in-situ observations from ocean observatory networks exhibit the variation and overall dynamics of these systems. We further aim to include the fate of the hydrocarbons as they are consumed by biological processes or get absorbed in the ocean and/or escape into the atmosphere from shallow-water seeps. Potential energy resources and anthropogenic sources like blowouts are included in this multi-disciplinary session.
Primary Convener:  Martin Scherwath, University of Victoria, Ocean Networks Canada, Victoria, BC, Canada
Conveners:  Tamara Baumberger, University of Bergen, Bergen, Norway; NOAA Pacific Marine Environmental Laboratory, Newport, Oregon, United States, Ira Leifer, Bubbleology Research International, Goleta, United States and Hiroaki Watanabe, Kyushu University, Faculty of Engineering Sciences, Fukuoka, Japan
Primary Liaison:  Martin Scherwath, University of Victoria, Ocean Networks Canada, Victoria, BC, Canada
Chairs:  Martin Scherwath, University of Victoria, Ocean Networks Canada, Victoria, BC, Canada, Tamara Baumberger, University of Bergen, Bergen, Norway, Ira Leifer, Bubbleology Research International, Goleta, United States and Hiroaki Watanabe, Kyushu University, Faculty of Engineering Sciences, Fukuoka, Japan
OSPA Liaison:  Martin Scherwath, University of Victoria, Ocean Networks Canada, Victoria, BC, Canada
Index Terms:

3002 Continental shelf and slope processes [MARINE GEOLOGY AND GEOPHYSICS]
3004 Gas and hydrate systems [MARINE GEOLOGY AND GEOPHYSICS]
3045 Seafloor morphology, geology, and geophysics [MARINE GEOLOGY AND GEOPHYSICS]
3050 Ocean observatories and experiments [MARINE GEOLOGY AND GEOPHYSICS]

Abstracts Submitted to this Session:

Observations of gas plumes in the sea areas surrounding Japan using quantitative echo sounders and multibeam sonars from 2004 (Invited) (420137)
Chiharu Aoyama, Tokyo University of Marine Science and Technology, Tokyo, Japan
Effect of Surface layer methane hydrate production on the Ecosystem (361689)
Koichi Nagao, Tokyo University of Marine Science and Technology, Tokyo, Japan
Necessity for Japan to Have New Pipeline for Methane Hydrates Development Project and How Japan Should Rail Pipelines (363134)
Airi Hikita, Tokyo University of Marine Science and Technology, Tokyo, Japan
A New Method for Sampling Solid Methane Hydrate on the Seafloor (374660)
John E Lupton, NOAA/PMEL, Newport, OR, United States, Tamara Baumberger, Oregon State University, Corvallis, United States, Conrad Young, Engineer, Ramona, CA, United States, Robert W Embley, Oregon State University, CIMRS, Corvallis, OR, United States, Susan G. Merle, Oregon State University, Corvalis, United States and Camilla Maya Wilkinson, Oregon State University, CIMRS, Newport, OR, United States
Categorizing Submarine Cold Seeps by Geomorphology and Acoustic Response Utilizing Publicly Available Multibeam Echo Sounder and Remotely Operated Vehicle Datasets (444452)
Kelley Brumley1, Christina J Maschmeyer1 and Garrett Alan Mitchell2, (1)Fugro USA Marine, Inc., Houston, TX, United States, (2)Fugro USA Marine, Inc, Houston, TX, United States
Methane-driven microbial community succession in Arctic seafloor gas hydrate mounds (364034)
Scott Klasek, Oregon State University, Corvallis, OR, United States, WeiLi Hong, Geological Survey of Norway, Trondheim 7491, Norway, Alexey Portnov, University of Texas at Austin, Jackson School of Geosciences Institute for Geophysics, Austin, TX, United States, Marta E Torres, Oregon State Univ, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States and Frederick S Colwell, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States
Gas venting along the seismically active North-Anatolian Fault Network (Sea of Marmara, Turkey): Impacts on the biological and geochemical characteristics of the seafloor (373229)
Livio Ruffine, IFREMER, Geosciences Marines, EDROME, Plouzané, France and Hélène Ondreasa, M. Namık Çağatayb, Carla Scalabrina, Barbara M. A. Teichertc, Marie-Madeleine Blanc-Vallerond, Dominique Birota, Catherine Pierree, Jean-Pierre Donvala, Yoan Germaina, Hailong Luf, Emmanuel Ponzeverag, Claire Croguenneca, Emmanuel Rinnert
Forecasting seafloor fluid expulsion using sparse observations of seafloor fluid expulsion anomalies (SEAFLEAs) and machine learning (370489)
Benjamin J Phrampus1,2, Warren T Wood1, Taylor Runyan Lee1 and John Yu2, (1)US Naval Research Laboratory, Ocean Sciences Division, Washington, DC, United States, (2)ASEE Student Apprenticeship, US Naval Research Laboratory, Stennis Space Center, United States

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