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Description

The Ocean Biology DAAC produces near real-time (NRT) products using the best-available combination of ancillary data from meteorological and ozone data. As such, the inputs and the calibration used are less than optimal. Near real-time products provide a snapshot of the data during a short time period within a single orbit.

The Ocean Color (OC) data suite provides calibrated, atmospherically corrected ocean-optics measurements and derived biogeophysical products. This data suite includes the Apparent Optical Properties (AOP) and provides satellite-derived measures of the interaction between solar radiation and the upper ocean. AOPs are "apparent" because they depend not only on the inherent optical properties (IOPs) of seawater and its constituents but also on the ambient light field. These variables are critical for studying light penetration, primary productivity, and biogeochemical cycling.

This activity was informed by the Satellite Needs Working Group (SNWG), an interagency effort of the U.S. Government dedicated to identifying and addressing Earth observation needs across U.S. civilian federal agencies.

Geophysical variables in this suite include:

  • Kd_490 - Diffuse attenuation coefficient at 490 nm, KD2 algorithm (m⁻¹)
  • Rrs - Remote sensing reflectance (sr⁻¹)
  • angstrom - Aerosol Angstrom exponent, 443 to 865 nm
  • chlor_a - Chlorophyll Concentration, OCI Algorithm (mg m⁻³)
    • l2_flags - Level-2 Processing Flags
    • aot_865 - Aerosol optical thickness at 865 nm

Product Summary

Platforms
Sentinel-3B
Instruments
OLCI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Location
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2018-04-25 to Present
Data Partner
Ocean Biology Processing Group (OBPG) ,
Ocean Biology Distributed Active Archive Center (OB.DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/GCDC/OB.DAAC)
Concept ID
C3407754966-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
60713
Processing Level
2
Published
Updated
Science Keywords
Ocean Color ,
Reflectance ,
Aerosol Optical Depth/Thickness ,
Angstrom Exponent ,
Chlorophyll Concentration ,
Attenuation/Transmission ,
Organic Carbon ,
Inorganic Carbon ,
Fluorescence ,
Photosynthetically Active Radiation

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 Description Units Data Type Fill Value Valid Range Scale Factor Offset
geophysical_data/angstrom Aerosol Angstrom exponent, 443 to 865 nm N/A int16 -32767 -30000 to 5000 9.9999997473788E-5 2.5
geophysical_data/aot_865 Aerosol optical thickness at 865 nm N/A int16 -32767 0 to 30000 9.9999997473788E-5 0
geophysical_data/chlor_a Chlorophyll Concentration, OCI Algorithm mg m^-3 float32 -32767 0.0010000000474975 to 100 N/A N/A
geophysical_data/Kd_490 Diffuse attenuation coefficient at 490 nm, KD2 algorithm m^-1 int16 -32767 50 to 30000 0.00019999999494758 0
geophysical_data/Rrs_400 Remote sensing reflectance at 400 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_412 Remote sensing reflectance at 412 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_443 Remote sensing reflectance at 443 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_490 Remote sensing reflectance at 490 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_510 Remote sensing reflectance at 510 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_560 Remote sensing reflectance at 560 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_620 Remote sensing reflectance at 620 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_665 Remote sensing reflectance at 665 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_674 Remote sensing reflectance at 674 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_681 Remote sensing reflectance at 681 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
geophysical_data/Rrs_709 Remote sensing reflectance at 709 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6 0.050000000745058
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