Replication Data for: Contrasting methane seepage dynamics in Hola trough offshore Norway: Insights from two different summers

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Ferré, Benedicte; Barreyre, Thibaut; Bünz, Stefan; Argentino, Claudio; Corrales-Guerrero, Jorge; Dølven, Knut Ola; Stetzler, Marie; Fallati, Luca; Sert, Muhamed Fatih; Panieri, Giuliana; Rastrick, Samuel; Kutti, Tina; Moser, Manuel, 2024, "Replication Data for: Contrasting methane seepage dynamics in Hola trough offshore Norway: Insights from two different summers", https://doi.org/10.18710/FCINC0, DataverseNO, V1

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Description	This dataset contains all the necessary data (including cluster flares locations and flow rate, CTD temperature, salinity and methane concentration, cold coral reefs locations, nodes locations as well as seep locations) for reproducing the results in the associated article: "Contrasting methane seepage dynamics in Hola trough offshore Norway: Insights from two different summers" (19/01/2024) Abstract: This study investigates the temporal variations in methane concentration and flare activity in the Hola trough (offshore Norway) during May 2018 and June 2022. Between these time periods, methane seep activity exhibits 3.5 times increase, as evidenced by hydroacoustic measurements. As the seep area in the Hola trough is constantly within the hydrate stability zone, the observed increase cannot be attributed to migration of its shallow boundary due to temperature increase. However, a decrease in the sediment pore pressure resulting in a combination of an increase in bottom water temperature and low tide conditions is likely to explain the increase in seep observations in June 2022. The hypothesis of tide influence is supported by data collected from a piezometer deployed and recovered during the cruise showing that the tidal effect was observed 3 meters below the seafloor. Despite the numerous methane seeps detected, methane concentration and gas flow rates near the seafloor were low (<19 nM and <70 mL min-1, respectively) compared to other areas with methane seep activity. This is likely due to strong currents rapidly dispersing methane in the water column. Sub-seafloor investigations identified pathways for gas migration in methane seep areas, influenced by topography. This study provides valuable insights into the temporal dynamics of methane concentrations, flare activity, and gas distribution in the Hola trough, contributing to our understanding of offshore methane dynamics in the region. (2024-01-19)
Subject	Earth and Environmental Sciences
Keyword	Methane, seep, cold water coral reefs, microbial mats, Hydroacoustic
Related Publication	Ferré, B., Barreyre, T., Bünz, S., Argentino, C., Corrales-Guerrero, J., Dølven, K. O., et al. (2024). Contrasting methane seepage dynamics in the Hola trough offshore Norway: Insights from two different summers. Journal of Geophysical Research: Oceans, 129, e2024JC020949. https://doi.org/10.1029/2024JC020949 doi: 10.1029/2024JC020949
License/Data Use Agreement	CC0 1.0

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Citation Metadata

Persistent Identifier	doi:10.18710/FCINC0
Publication Date	2024-01-23
Title	Replication Data for: Contrasting methane seepage dynamics in Hola trough offshore Norway: Insights from two different summers
Author	Ferré, Benedicte (UiT The Arctic University of Norway) - ORCID: 0000-0003-1646-9287 Barreyre, Thibaut (CNRS, Univ Brest, France) - ORCID: 0000-0002-5109-2633 Bünz, Stefan (UiT The Arctic University of Norway) - ORCID: 0000-0002-9215-7325 Argentino, Claudio (UiT The Arctic University of Norway) - ORCID: 0000-0003-2680-4528 Corrales-Guerrero, Jorge (Institute of Marine Research, Bergen, Norway) - ORCID: 0009-0000-5226-2916 Dølven, Knut Ola (UiT The Arctic University of Norway) - ORCID: 0000-0002-5315-4834 Stetzler, Marie (UiT The Arctic University of Norway) - ORCID: 0000-0002-2829-4456 Fallati, Luca (University of Milano-Bicocca, Milano, Italy) - ORCID: 0000-0002-5816-6316 Sert, Muhamed Fatih (UiT The Arctic University of Norway) 0000-0002-2442-0929 Panieri, Giuliana (UiT The Arctic University of Norway) - ORCID: 0000-0001-9411-1729 Rastrick, Samuel (Institute of Marine Research, Bergen, Norway) - ORCID: 0000-0002-8123-222X Kutti, Tina (Institute of Marine Research, Bergen, Norway) - ORCID: 0009-0007-1242-474X Moser, Manuel (UiT The Arctic University of Norway) - ORCID: 0000-0002-3135-336
Point of Contact	Use email button above to contact. Ferré, Benedicte (UiT The Arctic University of Norway)
Description	This dataset contains all the necessary data (including cluster flares locations and flow rate, CTD temperature, salinity and methane concentration, cold coral reefs locations, nodes locations as well as seep locations) for reproducing the results in the associated article: "Contrasting methane seepage dynamics in Hola trough offshore Norway: Insights from two different summers" (19/01/2024) Abstract: This study investigates the temporal variations in methane concentration and flare activity in the Hola trough (offshore Norway) during May 2018 and June 2022. Between these time periods, methane seep activity exhibits 3.5 times increase, as evidenced by hydroacoustic measurements. As the seep area in the Hola trough is constantly within the hydrate stability zone, the observed increase cannot be attributed to migration of its shallow boundary due to temperature increase. However, a decrease in the sediment pore pressure resulting in a combination of an increase in bottom water temperature and low tide conditions is likely to explain the increase in seep observations in June 2022. The hypothesis of tide influence is supported by data collected from a piezometer deployed and recovered during the cruise showing that the tidal effect was observed 3 meters below the seafloor. Despite the numerous methane seeps detected, methane concentration and gas flow rates near the seafloor were low (<19 nM and <70 mL min-1, respectively) compared to other areas with methane seep activity. This is likely due to strong currents rapidly dispersing methane in the water column. Sub-seafloor investigations identified pathways for gas migration in methane seep areas, influenced by topography. This study provides valuable insights into the temporal dynamics of methane concentrations, flare activity, and gas distribution in the Hola trough, contributing to our understanding of offshore methane dynamics in the region. (2024-01-19)
Subject	Earth and Environmental Sciences
Keyword	Methane (CH4) https://en.wikipedia.org/wiki/Methane seep cold water coral reefs microbial mats Hydroacoustic
Related Publication	Ferré, B., Barreyre, T., Bünz, S., Argentino, C., Corrales-Guerrero, J., Dølven, K. O., et al. (2024). Contrasting methane seepage dynamics in the Hola trough offshore Norway: Insights from two different summers. Journal of Geophysical Research: Oceans, 129, e2024JC020949. https://doi.org/10.1029/2024JC020949 doi: 10.1029/2024JC020949 https://doi.org/10.1029/2024JC020949
Language	English
Producer	UiT The Arctic University of Norway (UiT) https://en.uit.no/
Contributor	Data Collector : LoVe observatory
Funding Information	The Research Council of Norway: 320100 The Research Council of Norway: 223259
Distributor	UiT The Arctic University of Norway (UiT) https://dataverse.no/dataverse/uit
Depositor	Ferré, Benedicte
Deposit Date	2024-01-19
Time Period	Start Date: 2018-05-10 ; End Date: 2022-06-15
Date of Collection	Start Date: 2018-05-10 ; End Date: 2022-06-15
Data Type	survey data, observation data, ROV data
Software	ESP3, Version: 1.52 flare_clustering, Version: 1 QPS Fledermaus, Version: 7.8.1 ArcGIS, Version: 10.8.2 FMMidwater, Version: 7.8.1

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Geographic Bounding Box	14.19 14.381 68.964 68.859

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