oceans satellite imagery
The Aqua satellite platform carries a MODIS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These multi-spectral measurements are used to infer the diffuse attenuation coefficient (Kd) at 490nm wavelength which provides information on how light is attenuated in the water column. It is defined as the scaling length of the exponential decrease of the downwelling irradiance and has units (m^-1). The MODIS K490 product estimates Kd at 490nm wavelength, using a semi-empirical model based on the ratio of water leaving radiances at 490nm and 555nm. The algorithm is described at https://oceancolor.gsfc.nasa.gov/atbd/kd/.
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Satellite - Ocean Colour - MODIS - 1 day - Diffuse attenuation coefficient (k490) was accessed on DATE from https://registry.opendata.aws/aodn_satellite_diffuse_attenuation_coefficent_1day_aqua. The citation in a list of references is: "IMOS [year-of-data-download], [Title], [data-access-URL], accessed [date-of-access]."
arn:aws:s3:::aodn-cloud-optimised/satellite_diffuse_attenuation_coefficent_1day_aqua.zarrap-southeast-2aws s3 ls --no-sign-request s3://aodn-cloud-optimised/satellite_diffuse_attenuation_coefficent_1day_aqua.zarr/