Bodenbinder, Andrea; Schmidt, Mark; Haeckel, Matthias (2025): Dissolved methane concentrations of water samples from the North Sea during ALKOR cruise AL575 (27 June 2022 - 13 July 2022) [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.979903 (DOI registration in progress)
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Published: 2025-03-28
Abstract:
Water sampling was conducted during AL575 cruise in the North Sea by using Niskin Bottles attached to CTD/Water sampler rosette and ROV (Haeckel and Schmidt, 2024).
To detect methane anomalies in the water column derived from seafloor gas emissions the recovered water samples were processed by using headspace gas sampling and subsequent gas chromatographic analysis. Based on measured methane concentrations of headspace gas in (micro-atm) the dissolved methane concentrations in water were calculated (nmol l-1).
Related to:
Haeckel, Matthias; Schmidt, Mark (2024): Assessing the risk of greenhouse gas emissions from abandoned wells, Cruise No. AL575, 27 JUNE 2022 - 13 JULY 2022, Kiel - Kiel, GEOSTOR leak. Alkor-Berichte, GEOMAR Helmholtz Centre for Ocean Research Kiel, AL575, 33 pp, https://doi.org/10.3289/CR_AL575
Project(s):
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0893A: DAM CDRmare - GEOSTOR, GEOMAR
Coverage:
Median Latitude: 56.825405 * Median Longitude: 2.496554 * South-bound Latitude: 54.165860 * West-bound Longitude: 0.245891 * North-bound Latitude: 58.135838 * East-bound Longitude: 6.971960
Date/Time Start: 2022-06-30T22:19:03 * Date/Time End: 2022-07-11T16:29:31
Minimum DEPTH, water: 7 m * Maximum DEPTH, water: 152 m
Event(s):
AL575_1-1 * Latitude: 56.967290 * Longitude: 2.221260 * Date/Time: 2022-06-30T22:06:25 * Elevation: -76.0 m * Location: North Sea * Campaign: AL575 (GEOSTOR leak) * Basis: Alkor (1990) * Method/Device: CTD/Rosette (CTD-RO)
AL575_3-1 * Latitude Start: 57.004890 * Longitude Start: 2.165620 * Latitude End: 56.999430 * Longitude End: 2.158080 * Date/Time Start: 2022-07-01T07:24:00 * Date/Time End: 2022-07-01T16:28:17 * Elevation Start: -82.0 m * Elevation End: -84.0 m * Location: North Sea * Campaign: AL575 (GEOSTOR leak) * Basis: Alkor (1990) * Method/Device: Remote operated vehicle (ROV) * Comment: BoSi
AL575_10-1 * Latitude Start: 57.930290 * Longitude Start: 0.245700 * Latitude End: 57.928730 * Longitude End: 0.246190 * Date/Time Start: 2022-07-07T16:20:24 * Date/Time End: 2022-07-07T18:41:06 * Elevation Start: -131.0 m * Elevation End: -131.0 m * Location: North Sea * Campaign: AL575 (GEOSTOR leak) * Basis: Alkor (1990) * Method/Device: Remote operated vehicle (ROV) * Comment: BoSi
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Schmidt, Mark | |||
| 2 | Sample code/label | Sample label | Schmidt, Mark | |||
| 3 | DATE/TIME | Date/Time | Schmidt, Mark | Geocode | ||
| 4 | LONGITUDE | Longitude | Schmidt, Mark | Geocode | ||
| 5 | LATITUDE | Latitude | Schmidt, Mark | Geocode | ||
| 6 | DEPTH, water | Depth water | m | Schmidt, Mark | Geocode | |
| 7 | Methane, partial pressure | pCH4 | µatm | Schmidt, Mark | Headspace gas chromatography | |
| 8 | Methane | CH4 | nmol/l | Schmidt, Mark | Headspace gas chromatography |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
42 data points