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van Haren, Hans; Hanz, Ulrike; de Stigter, Henko; Mienis, Furu; Duineveld, Gerard C A (2018): Water column characteristics obtained by yoyo-CTD and mooring sensors and benthic organism abundance of a biologically rich seamount of the Mid-Atlantic Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.884597, Supplement to: van Haren, H et al. (2017): Internal wave turbulence at a biologically rich Mid-Atlantic seamount. PLoS ONE, 12(12), e0189720, https://doi.org/10.1371/journal.pone.0189720

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Abstract:
The turbulence regime near the crest of a biologically rich seamount of the Mid-Atlantic Ridge southwest of the Azores was registered in high spatial and temporal resolution. Internal tides and their higher harmonics dominate the internal wave motions, producing considerable shear-induced turbulent mixing in layers of 10±50 m thickness. This interior mixing of about 100 times open-ocean interior values is observed both at a high-resolution temperature sensor mooring-site at the crest, 770 m water depth being nearly 400 m below the top of the seamount, and a CTD-yoyo site at the slope off the crest 400 m horizontally away, 880 m water depth. Only at the mooring site, additionally two times higher turbulence is observed near the bottom, associated with highly non-linear wave breaking. The highest abundance of epifauna, notably sponges, are observed just below the crest and 100 m down the eastern slope (700±800 m) in a cross-ridge video-camera transect. This sponge belt is located in a water layer of depressed oxygen levels (saturation 63±2%) with a local minimum centered around 700 m. Turbulent mixing supplies oxygen to this region from above and below and is expected to mix nutrients away from this biodegraded layer towards the depth of highest abundance of macrofauna.
Project(s):
Deep-sea Sponge Grounds Ecosystems of the North Atlantic (SponGES)
Funding:
Horizon 2020 (H2020), grant/award no. 679849: Deep-sea Sponge Grounds Ecosystems of the North Atlantic
Coverage:
Median Latitude: 36.393349 * Median Longitude: -33.890629 * South-bound Latitude: 36.390000 * West-bound Longitude: -33.899900 * North-bound Latitude: 36.416600 * East-bound Longitude: -33.873800
Date/Time Start: 2016-06-29T19:28:00 * Date/Time End: 2016-07-10T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. van Haren, H; Hanz, U; de Stigter, H et al. (2018): (Figure 3) Density anomaly referenced to 650 dbar and corresponding absolute salinity and oxygen levels of CTD-profile number 12. https://doi.org/10.1594/PANGAEA.884591
  2. van Haren, H; Hanz, U; de Stigter, H et al. (2018): (Figure 3) Ten day mean buoyancy frequency and turbulence dissipation rate of the mooring. https://doi.org/10.1594/PANGAEA.884592
  3. van Haren, H; Hanz, U; de Stigter, H et al. (2018): (Figure 4) 13 hour oxygen concentrations obtained by CTD-yoyo measurements. https://doi.org/10.1594/PANGAEA.884593
  4. van Haren, H; Hanz, U; de Stigter, H et al. (2018): (Figure 4) 13 hour conservative temperature records obtained by CTD-yoyo measurements. https://doi.org/10.1594/PANGAEA.884594
  5. van Haren, H; Hanz, U; de Stigter, H et al. (2018): (Figure 6) Abundance of all organisms found along four video transects. https://doi.org/10.1594/PANGAEA.884595
  6. van Haren, H; Hanz, U; de Stigter, H et al. (2018): Conservative temperature records and current meter measurements from moored sensors, link to files. https://doi.org/10.1594/PANGAEA.884596