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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
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
C3652817442-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
308
Processing Level
3
Published
Updated
Science Keywords
Aerosol Particle Properties

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
alh Aerosol layer height km float32 -32767 0 to 100 N/A
angstrom_440_670 Aerosol Angstrom exponent, 440 to 670 nm N/A float32 -32767 -0.5 to 3 N/A
angstrom_440_870 Aerosol Angstrom exponent, 440 to 870 nm N/A float32 -32767 -0.5 to 3 N/A
aot Aerosol optical thickness N/A int16 -32767 0 to 30000 9.9999997473788E-5
aot_coarse Aerosol optical thickness for coarse mode N/A int16 -32767 0 to 30000 9.9999997473788E-5
aot_fine Aerosol optical thickness for fine mode N/A int16 -32767 0 to 30000 9.9999997473788E-5
chla_mapol Chlorophyll Concentration, MAPOL Algorithm mg m^-3 float32 -32767 0.0010000000474975 to 100 N/A
fmf Aerosol fine mode fraction N/A float32 -32767 0 to 1 N/A
fvf Aerosol fine mode fraction by volume N/A float32 -32767 0 to 1 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
qual Quality Level N/A uint8 255 0 to 5 N/A
reff_coarse Aerosol effective radius of coarse mode micron float32 -32767 0 to 10 N/A
reff_fine Aerosol effective radius of fine mode micron float32 -32767 0 to 10 N/A
Rrs1_mean Mean remote sensing reflectance sr^-1 float32 -32767 -0.0099999997764826 to 0.10000000149012 N/A
Rrs1_std Standard deviation of remote sensing reflectance sr^-1 float32 -32767 -0.0099999997764826 to 0.10000000149012 N/A
Rrs2_mean Mean remote sensing reflectance sr^-1 float32 -32767 -0.0099999997764826 to 0.10000000149012 N/A
Rrs2_std Standard deviation of remote sensing reflectance sr^-1 float32 -32767 -0.0099999997764826 to 0.10000000149012 N/A
sph_coarse Aerosol spherical fraction of coarse mode micron float32 -32767 0 to 1 N/A
sph_fine Aerosol spherical fraction of fine mode micron float32 -32767 0 to 1 N/A
ssa Aerosol single scattering albedo N/A int16 -32767 0 to 30000 9.9999997473788E-5
ssa_coarse Aerosol single scattering albedo of coarse mode N/A int16 -32767 0 to 30000 9.9999997473788E-5
ssa_fine Aerosol single scattering albedo of fine mode N/A int16 -32767 0 to 30000 9.9999997473788E-5
wavelength wavelengths nm int32 -32767 0 to 20000 N/A
windspeed Wind Speed at 10 meters m s^-1 float32 -32767 0 to 50 N/A
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