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CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Atmosphere >
Radiation budget >
Diffuse attenuation coefficient (DAC)

Measurement Definition*: Former name: “Water clarity”. Parameter extracted from ocean colour observation. Indicative of water turbidity and vertical processes in the ocean. Requested in both open ocean and coastal zone - Physical unit: [ m-1 ] - Accuracy unit: [m-1 ].
InstrumentStatus/
Accuracy		Instrument DescriptionMeasurement TechnologyTimeline
MODIS
MODerate-Resolution Imaging Spectroradiometer		Operational
Data on biological and physical processes on the surface of the Earth and in the lower atmosphere, and on global dynamics. Surface temperatures of land and ocean, chlorophyll fluorescence, land cover measurements, cloud cover (day and night).n/a
OLCI
Ocean and Land Colour Imager		Operational
Marine and land services.n/a
VIS-NIR
Multi-spectral Optical Camera - Visible & Near Infrared		Approved
Ocean Colour - Open ocean, coastal & in-land waters.n/a
* Description adapted from WMO.
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