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On October 22, 2024, 8:43:53 PM UTC, Gravatar ckan_admin:

  • Updated description of ADCP data Whittard Canyon 64PE453-53 from

    Sediment, nutrients, organic carbon and pollutants are funnelled down submarine canyons from continental shelves by sediment-laden flows called turbidity currents, which dominate particulate transfer to the deep-sea. Post-glacial sea-level rise disconnected more than three quarters of the >9000 submarine canyons worldwide from their former river or long-shore drift sediment inputs. Existing models therefore assume that land-detached submarine canyons are dormant in the present-day; however, monitoring has focused on land-attached canyons and this paradigm remains untested. Here we present the most detailed field measurements yet of turbidity currents within a land-detached submarine canyon, documenting a remarkably similar frequency (6/year) and speed (up to 5-8 m/s) to those in large land-attached submarine canyons. Major triggers such as storms or earthquakes are not required; instead, seasonal variations in cross-shelf transport explain temporal-clustering of flows, and why the storm season is surprisingly absent of turbidity currents. As >1000 other canyons have a similar configuration, we propose that contemporary deep-sea particulate transport via such land-detached canyons may have been dramatically under-estimated.
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    This dataset covers ADCP data collected in Whittard Canyon at 2200 m water depth. THe 75 kHz ADCP was upward looking and deployed in Whittard to monitor daily to seasonal changes in current speed and acoustic backscatter.


  • Changed the version of ADCP data Whittard Canyon 64PE453-53 to 2 (previously 1)