N: 90 S: -90 E: 180 W: -180
Description
The spectral diffuse attenuation coefficient of downwelling irradiance (Kd). Kd is an apparent optical property (AOP) that is derived from IOPs using the Lee bio-optical model. Kd describes how visible light diminishes with depth in the ocean. Lower values indicate clearer water (deeper light penetration); users commonly apply Kd to estimate euphotic depth, track coastal water quality and turbidity, interpret bloom/light environments, and supply inputs to biogeochemical and ecosystem models. As with all ocean-color products, uncertainties can be larger in optically complex coastal or inland waters; refer to the file metadata and algorithm documentation for quality flags and usage notes.
Geophysical variables in this suite include:
?~@? Kd — Diffuse attenuation coefficient of downwelling irradiance, Lee algorithm (m⁻¹)
Product Summary
Documents
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
GENERAL DOCUMENTATION
Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor | Offset |
|---|---|---|---|---|---|---|---|
| Kd | Diffuse attenuation coefficient | m^-1 | int16 | -32767 | 50 to 30000 | 0.00019999999494758 | 0 |
| lat | Latitude | degrees_north | float32 | -999 | -90 to 90 | N/A | N/A |
| lon | Longitude | degrees_east | float32 | -999 | -180 to 180 | N/A | N/A |
| palette | palette | N/A | uint8 | N/A | N/A | N/A | N/A |
| wavelength | wavelengths | nm | int32 | -32767 | 0 to 20000 | N/A | N/A |