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Description

MAPOL_OCEAN provides simultaneous aerosol and ocean color products using the Fast Multi-Angle Polarimetric Ocean and Land algorithm (FastMAPOL). The retrievals jointly solve for aerosol and ocean parameters with a coupled atmosphere and ocean vector radiative-transfer model, accelerated by deep neural networks to improve speed and accuracy. The retrieved aerosol properties are then used to derive angular water leaving signals through multi-angle atmospheric corrections. Use these products for advanced aerosol and ocean color studies, cross-sensor and cross-algorithm data product analysis.

Core geophysical variables in this suite include:
• Rrs1/Rrs2 — Angular remote sensing reflectance before and after BRDF correction (sr⁻¹)
• chla_mapol — Chlorophyll-a concentration (mg m⁻³)
• aot / aot_fine / aot_coarse — Aerosol optical thickness for total/fine/coarse mode (unitless)
• ssa / ssa_fine / ssa_coarse — Aerosol single scattering albedo for total/fine/coarse mode (unitless)
• fmf / fvf — Aerosol fine mode fraction and fine mode volume fraction (unitless)
• angstrom — Aerosol Ångström exponent (unitless; reported for 440–670 nm and 440–870 nm)
• alh — Aerosol layer height (km)
• reff_fine / reff_coarse — Aerosol effective radius for fine/coarse mode (µm)
• veff_fine / veff_coarse — Aerosol effective variance for fine/coarse mode (unitless)
• sph / sph_fine / sph_coarse — Aerosol spherical fraction for total/fine/coarse mode (unitless)
• mr / mi — Real and imaginary parts of aerosol refractive index (unitless; total/fine/coarse modes available)
• vd — Aerosol volume density (µm³ µm⁻²; fine/coarse modes and submodes also available)
• wind_speed — Ocean surface wind speed (m s⁻¹)

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
GEODETIC
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
C3652817426-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
72181
Processing Level
2
Published
Updated
Science Keywords
Aerosol Particle Properties

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-2 Regional Aerosol Over Ocean Optical Properties, FastMAPOL Algorithm, version 3.0 [Data set]. NASA Ocean Biology Distributed Active Archive Center. https://doi.org/10.5067/PACE/SPEXONE/L2/MAPOL_OCEAN/3.0 Date Accessed: 2026-02-15

Documents

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
diagnostic_data/chi2 Cost function value N/A float32 -32767 N/A N/A
diagnostic_data/chi2_first_guess Cost function value of the first guess N/A float32 -32767 N/A N/A
diagnostic_data/mask_dolp Adaptive data mask for DoLP (0:clear, 1: masked) N/A int8 -1 N/A N/A
diagnostic_data/mask_ref Adaptive data mask for reflectance (0:clear, 1: masked) N/A int8 -1 N/A N/A
diagnostic_data/nfev Number of forward calculations N/A int32 -32767 N/A N/A
diagnostic_data/njev Number of Jacobian calculations N/A int32 -32767 N/A N/A
diagnostic_data/nv_dolp Number of angles for DoLP N/A int32 -32767 N/A N/A
diagnostic_data/nv_ref Number of angles for reflectance N/A int32 -32767 N/A N/A
diagnostic_data/ozone Ancillary ozone column density Dobson float32 -32767 N/A N/A
diagnostic_data/quality_flag Quality flag, 0: best, others with lower quality N/A int32 -32767 N/A N/A
diagnostic_data/surface_pressure Ancillary surface pressure mb float32 -32767 N/A N/A
diagnostic_data/timing Retrieval time per pixel N/A float32 -32767 N/A N/A
geolocation_data/latitude Latitude degrees_north float32 -32767 N/A N/A
geolocation_data/longitude Longitude degrees_east float32 -32767 N/A N/A
geophysical_data/alh Aerosol layer height km float32 -32767 N/A N/A
geophysical_data/angstrom_440_670 Aerosol Angstrom exponent, 440 to 670 nm N/A float32 -32767 N/A N/A
geophysical_data/angstrom_440_870 Aerosol Angstrom exponent, 440 to 870 nm N/A float32 -32767 N/A N/A
geophysical_data/aot Aerosol optical thickness N/A float32 -32767 N/A N/A
geophysical_data/aot_coarse Aerosol optical thickness (coarse mode) N/A float32 -32767 N/A N/A
geophysical_data/aot_fine Aerosol optical thickness (fine mode) N/A float32 -32767 N/A N/A
geophysical_data/chla Chlorophyll-a concentration mg m^-3 float32 -32767 N/A N/A
geophysical_data/fmf Aerosol fine mode fraction ( aot_fine/aot) N/A float32 -32767 N/A N/A
geophysical_data/fvf Aerosol fine mode volume fraction (vd_fine/vd) N/A float32 -32767 N/A N/A
geophysical_data/mi Spectral aerosol refractive index (mode average, imaginary part) N/A float32 -32767 N/A N/A
geophysical_data/mi_coarse Spectral aerosol refractive index (coarse mode, imaginary part) N/A float32 -32767 N/A N/A
geophysical_data/mi_fine Spectral aerosol refractive index (fine mode, imaginary part) N/A float32 -32767 N/A N/A
geophysical_data/mr Spectral aerosol refractive index (mode average, real part) N/A float32 -32767 N/A N/A
geophysical_data/mr_coarse Spectral aerosol refractive index (coarse mode, real part) N/A float32 -32767 N/A N/A
geophysical_data/mr_fine Spectral aerosol refractive index (fine mode, real part) N/A float32 -32767 N/A N/A
geophysical_data/reff_coarse Aerosol effective radius (coarse mode) um float32 -32767 N/A N/A
geophysical_data/reff_fine Aerosol effective radius (fine mode) um float32 -32767 N/A N/A
geophysical_data/Rrs1 Angular remote sensing reflectance (after atmospheric correction and transmittance correction) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs1_mean Remote sensing reflectance (angular mean on Rrs1) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs1_std Remote sensing reflectance (angular standard deviation on Rrs1) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs2 Angular remote sensing reflectance (after BRDF correction on Rrs1) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs2_mean Remote sensing reflectance (angular mean on Rrs2) sr^-1 float32 -32767 N/A N/A
geophysical_data/Rrs2_std Remote sensing reflectance (angular standard deviation on Rrs2) sr^-1 float32 -32767 N/A N/A
geophysical_data/sph Aerosol spherical fraction (volume density weighted) N/A float32 -32767 N/A N/A
geophysical_data/sph_coarse Aerosol spherical fraction (coarse mode) N/A float32 -32767 N/A N/A
geophysical_data/sph_fine Aerosol spherical fraction (fine mode) N/A float32 -32767 N/A N/A
geophysical_data/ssa Aerosol single scattering albedo (total) N/A float32 -32767 N/A N/A
geophysical_data/ssa_coarse Aerosol single scattering albedo (coarse mode) N/A float32 -32767 N/A N/A
geophysical_data/ssa_fine Aerosol single scattering albedo (fine mode) N/A float32 -32767 N/A N/A
geophysical_data/vd Aerosol volume density (total) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_coarse Aerosol volume density (coarse mode) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_fine Aerosol volume density (fine mode) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode1 Aerosol volume density (submode 1) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode2 Aerosol volume density (submode 2) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode3 Aerosol volume density (submode 3) um^3 um^-2 float32 -32767 N/A N/A
geophysical_data/vd_mode4 Aerosol volume density (submode 4) um^3 um^-2 float32 -32767 N/A N/A
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