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Römer, Miriam; Wenau, Stefan; Mau, Susan; Veloso, Valéria G; Greinert, Jens; Schlüter, Michael; Bohrmann, Gerhard (2017): (Table S2) List of all flow rates measured with the FlareFlowModule during HE-413 and HE-459. PANGAEA, https://doi.org/10.1594/PANGAEA.880359, Supplement to: Römer, M et al. (2017): Assessing marine gas emission activity and contribution to the atmospheric methane inventory: A multidisciplinary approach from the Dutch Dogger Bank seep area (North Sea). Geochemistry, Geophysics, Geosystems, 18(7), 2617-2633, https://doi.org/10.1002/2017GC006995

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Abstract:
We present a comprehensive study showing new results from a shallow gas seep area in ~40 m water depth located in the North Sea, Netherlands sector B13 that we call "Dutch Dogger Bank seep area." It has been postulated that methane presumably originating from a gas reservoir in ~600 m depth below the seafloor is naturally leaking to the seafloor. Our ship-based subbottom echosounder data indicate that the migrating gas is trapped in numerous gas pockets in the shallow sediments. The gas pockets are located at the boundary between the top of the Late Pliocene section and overlying fine-grained sediments, which were deposited during the early Holocene marine transgression after the last glaciation. We mapped gas emissions during three R/V Heincke cruises in 2014, 2015, and 2016 and repeatedly observed up to 850 flares in the study area. Most of them (~80%) were concentrated at five flare clusters. Our repeated analysis revealed spatial similarities of seep clusters, but also heterogeneities in emission intensities. A first calculation of the methane released from these clusters into the water column revealed a flow rate of 277 L/min (SD = 140), with two clusters emitting 132 and 142 L/min representing the most significant seepage sites. Above these two flare clusters, elevated methane concentrations were recorded in atmospheric measurements. Our results illustrate the effective transport of methane via gas bubbles through a ~40 m water column, and furthermore provide an estimate of the emission rate needed to allow for a contribution to the atmospheric methane concentration.
Further details:
Bohrmann, Gerhard (2015): Station list and links to master tracks in different resolutions of HEINCKE cruise HE444, Bremerhaven - Bremerhaven, 2015-05-11 - 2015-05-15. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.848834
Römer, Miriam (2017): Profile of sediment echo sounding with SES-2000 during HEINCKE cruise HE413 with links to raw data files. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.871594
Römer, Miriam (2017): Profile of sediment echo sounding with SES-2000 during HEINCKE cruise HE444 with links to raw data files. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.871894
Römer, Miriam (2017): Profile of sediment echo sounding with SES-2000 during HEINCKE cruise HE459 with links to raw data files. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.871712
Römer, Miriam (2017): Profile of vertical fish echo sounding with Simrad EK60 during HEINCKE cruise HE413 with links to raw data files. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.872158
Römer, Miriam (2017): Profile of vertical fish echo sounding with Simrad EK60 during HEINCKE cruise HE459 with links to raw data files. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.872159
Römer, Miriam (2017): Station list and links to master tracks in different resolutions of HEINCKE cruise HE413, Bremerhaven - Bremerhaven, 2014-01-13 - 2014-01-22. PANGAEA, https://doi.org/10.1594/PANGAEA.880578
Römer, Miriam (2016): Station list and links to master tracks in different resolutions of HEINCKE cruise HE459, Bremerhaven - Bremerhaven, 2016-03-28 - 2016-04-04. MARUM - Center for Marine Environmental Sciences, University Bremen, PANGAEA, https://doi.org/10.1594/PANGAEA.860875
Römer, Miriam (2017): Swath sonar multibeam bathymetry during HEINCKE cruise HE413 with links to raw data files of bathymetry and water column information. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.871072
Römer, Miriam (2017): Swath sonar multibeam bathymetry during HEINCKE cruise HE444 with links to raw data files of bathymetry and water column information. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.871093
Römer, Miriam (2017): Swath sonar multibeam bathymetry during HEINCKE cruise HE459 with links to raw data files of bathymetry and water column information. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.871229
Coverage:
Median Latitude: 53.599710 * Median Longitude: 8.502318 * South-bound Latitude: 53.567500 * West-bound Longitude: 8.444620 * North-bound Latitude: 53.635870 * East-bound Longitude: 8.554800
Date/Time Start: 2014-01-13T11:25:00 * Date/Time End: 2016-03-28T00:00:00
Event(s):
HE413-track * Latitude Start: 53.635870 * Longitude Start: 8.444620 * Latitude End: 53.627970 * Longitude End: 8.455050 * Date/Time Start: 2014-01-13T11:25:00 * Date/Time End: 2014-01-19T13:25:00 * Campaign: HE413 * Basis: Heincke * Device: Underway cruise track measurements (CT)
HE459-track * Latitude Start: 53.567500 * Longitude Start: 8.554800 * Latitude End: 53.567500 * Longitude End: 8.554800 * Date/Time Start: 2016-03-28T00:00:00 * Date/Time End: 2014-04-04T00:00:00 * Campaign: HE459 * Basis: Heincke * Device: Underway cruise track measurements (CT)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventRömer, Miriam
2Campaign of eventCampaignRömer, Miriam
3Area/localityAreaRömer, Miriam
4Target strengthTSRömer, Miriam
5Methane flow rateCH4 flow rateml/minRömer, MiriamFlareFlowModule
Size:
495 data points

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