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Description

The RemoTAP Level-3 Chlorophyll-a (Chla) product provides estimates of surface chlorophyll-a concentration, a commonly used proxy for phytoplankton biomass. Values are derived using the RemoTAP algorithm.

In the current version, the variable is named chlor_a, with the long name “Chlorophyll-a concentration, OCI algorithm.” The variable and its long name will be updated in a future release to correctly reference the RemoTAP algorithm.

Geophysical variable included:
• chlor_a – Chlorophyll concentration (mg m⁻³)

Version Description

Reprocessing of Ocean Color (OC) Datasets

Product Summary

Platforms
PACE
Instruments
SPEXone
Spatial Extent

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

Location
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2024-02-05 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
C3555840343-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
592
Processing Level
3
Published
Updated
Science Keywords
Ocean Color

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

NASA Ocean Biology Processing Group. (2025). PACE SPEXone Level-3 Global Mapped Ocean Properties, RemoTAP Algorithm, version 3.0 [Data set]. NASA Ocean Biology Distributed Active Archive Center. https://doi.org/10.5067/PACE/SPEXONE/L3M/AER_RTAPOCEAN/3.0 Date Accessed: 2026-01-22

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
chlor_a Chlorophyll Concentration, OCI Algorithm mg m^-3 float32 -32767 0.0010000000474975 to 100 N/A
lat Latitude degrees_north float32 -999 -90 to 90 N/A
lon Longitude degrees_east float32 -999 -180 to 180 N/A
palette palette N/A uint8 N/A N/A N/A
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