Assessing the response of methane hydrates to environmental change at the Svalbard continental margin
This project reflects the results of cooperative research efforts between the US Department of Energy and scientists from Norway and Germany, who collaboratively designed the study, collected and analyzed samples from the water column and sediment and arrive at conclusions presented in joint publica...
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| Language: | unknown |
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2019
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| Online Access: | http://www.osti.gov/servlets/purl/1479469 https://www.osti.gov/biblio/1479469 https://doi.org/10.2172/1479469 |
| Summary: | This project reflects the results of cooperative research efforts between the US Department of Energy and scientists from Norway and Germany, who collaboratively designed the study, collected and analyzed samples from the water column and sediment and arrive at conclusions presented in joint publications. The main goal of the project was to assess the role of gas hydrate deposits in modulating methane discharge revealed through water column data, and assess the changes in environmental parameters, geochemical and microbiological conditions that drive the methane release in this high latitude region. Samples and data were collected from seven expeditions that encompassed extensive water column surveys, gravity coring, remotely-operated towed instrumentation and seafloor drilling campaigns. Geochemical and microbiological results were interpreted in the context of correlative geophysical data and numerical models, to generate a comprehensive and interdisciplinary view of the processes operating along the Svalbard margin. Incubation experiments complement the filed observations and provide additional data on the microbiological response to methane change. Collectively our results show that methane seepage in this margin is a component of a large methane plume, the Svalbard plume, which is not associated with gas hydrate processes. Consistently, numerical models of data from shallow (gravity cores offshore Storfjordrenna, bearing gas hydrate) and deep (MeBo drilling offshore Prins Karls Foreland) sediment samples show that methane and gas hydrate dynamics at sites that lie within the upper edge of gas hydrate stability are not responding to modern changes in bottom water temperature. Rather the data point to a long history of methane release, dominantly controlled by large scale Earth system changes (e.g., geology, oceanography, and glaciology) with gas hydrate as a temporary methane reservoir. Further results document the episodicity of the methane release, the role of microbes in sequestering methane carbon into ... |
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