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Description

The Chlorophyll-a data suite provides global, gridded composites of surface chlorophyll-a concentration (a proxy for phytoplankton biomass). Products are delivered as daily, 8-day/weekly, monthly, seasonal, and annual maps on standard equal-angle grids (commonly 4 km and 9 km) in CF-compliant NetCDF. L3M CHL supports time-series and climatologies, anomaly detection, ecosystem and fisheries applications, and teaching/training, and pairs well with PAR, Kd(490), SST, and winds for environmental context. Note: retrievals in optically complex coastal/inland waters may carry higher uncertainty—refer to the mission/algorithm documentation (e.g., OCx/OCI) for details.

Geophysical variables in this suite include:
• chlor_a — Chlorophyll-a concentration (mg m⁻³)

Version Description

Reprocessing of Ocean Color (OC) Datasets

Product Summary

Platforms
NOAA-21
Instruments
VIIRS
Spatial Extent

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

Geographic Region
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2022-11-10 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
C3779578237-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
106
Processing Level
3
Published
Updated
Science Keywords
Chlorophyll

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
level-3_binned_data/BinIndex level-3_binned_data/BinIndex N/A OTHER N/A N/A N/A
level-3_binned_data/BinList level-3_binned_data/BinList N/A OTHER N/A N/A N/A
level-3_binned_data/chlor_a level-3_binned_data/chlor_a N/A OTHER N/A 0.0010000000474975 to 100 N/A
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