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Diffuse Attenuation Coefficient (Dac)
Measurement Instruments
Measurements
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Atmosphere
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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 ].
Instrument
Status/
Accuracy
Instrument Description
Measurement Technology
Timeline
MODIS
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
OCI
Operational
Ocean color slit-grating imaging spectrometer/radiometer for measuring top of atmosphere reflectance which is used to estimate ocean leaving light that contains information on biological components plus aerosol and cloud propertiesl
n/a
OLCI
Operational
Marine and land services.
n/a
VIS-NIR
Approved
Ocean Colour - Open ocean, coastal & in-land waters.
n/a
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