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      "schema:description": "Te global Secchi Disk study engages seafarers to use a Secchi Disk to collect in situ data on ocean transparency that can be used to estimate phytoplankton biomass. Te Secchi Disk study uses a simple, 30 cm diameter white Secchi Disk that is weighted and attached to a tape-measure, and lowered vertically into the water from a boat’s side. Te depth (m) below the surface when the Secchi Disk disappears from sight is the Secchi depth (ZSD), which measures ocean transparency. When the bathymetry is >25 m depth and the distance >1 km from shore, the primary infuence upon ocean transparency is phytoplankton pigments and their breakdown products and therefore, ZSD estimates phytoplankton biomass in the water column; re-suspended sediments and dissolved organic matter from rivers further reduce transparency and introduce optical errors in shallower water and closer inshore. Marine scientists have used Secchi Disks to measure ocean transparency since 1865 and archives of ZSD represent one of the longest-running, spatially extensive global marine datasets. ",
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