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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 AER_UAA suite provides aerosol optical properties (AOP), retrieved using the Unified Aerosol Algorithm (UAA). Core variables include measures that describe aerosol loading, size partitioning, and absorption. A companion product in the same family provides the UV Absorbing Aerosol Index (UVAI_UAA). Typical uses include air-quality and climate analyses, aerosol context for ocean-color atmospheric correction, trend studies, and model evaluation; users should refer to per-file metadata/flags for quality screening and wavelength availability.

Core geophysical variables in this suite include:

  • Aerosol_Optical_Depth — Aerosol optical depth at multiple wavelengths (unitless)
  • AAOD — Average aerosol optical depth (unitless)
  • AerosolLayerHeight — Aerosol layer height (km)
  • AerosolSingleScattAlbedo — Aerosol single scattering albedo (unitless)
  • NUV_AerosolIndex — Near-UV aerosol index (unitless)
  • CloudOpticalDepth — Cloud optical depth (unitless)
  • CloudFraction — Radiative/derived cloud fraction (unitless; 0–1)
  • l2_flags — Level-2 Processing Flags (bitmask)

Product Summary

Platforms
PACE
Instruments
OCI
Spatial Extent

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

Location
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2024-03-05 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
C3620139326-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
41576
Processing Level
2
Published
Updated
Science Keywords
Aerosol Optical Depth/Thickness ,
UV Aerosol Index

Documents

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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
geolocation_data/latitude Geodetic Latitude degree_north float32 -999 N/A N/A N/A
geolocation_data/longitude Geodetic Longitude degree_east float32 -999 N/A N/A N/A
geolocation_data/sensor_azimuth_angle Sensor Azimuth Angle, Cell to Sensor degree int16 -32767 N/A 0.0099999997764826 0
geolocation_data/sensor_zenith_angle Sensor Zenith Angle, Cell to Sensor degree int16 -9999 N/A 0.0099999997764826 0
geolocation_data/solar_azimuth_angle Solar Azimuth Angle, Cell to Sun degree int16 -9999 N/A 0.0099999997764826 0
geolocation_data/solar_zenith_angle Solar Zenith Angle, Cell to Sun degree int16 -9999 N/A 0.0099999997764826 0
geophysical_data/AAOD Absorbing Aerosol Optical Depth at 0.354, 0.388, 0.550 N/A int16 -9999 N/A 0.0010000000474975 0
geophysical_data/Aerosol_Cld_Fraction_Land_Ocean Aerosol Cloud Fraction in each box km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/Aerosol_Optical_Depth Retrieved AOT at 0.354,0.388 0.48, 0.55, 0.67, 0.87 1.24, 1.64, 2.2 N/A int16 -9999 N/A 0.0010000000474975 0
geophysical_data/DT_AerosolLayerHeight Height 1.5KM 3KM, 6KM, 10KM) km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/DT_AerosolSingleScattAlbedo Single scattering Albedo from Dark Target ocean 0.354 and 0.388 and 0.550, microns N/A int16 -9999 N/A 0.0010000000474975 0
geophysical_data/l2_flags geophysical_data/l2_flags N/A int16 -9999 N/A N/A N/A
geophysical_data/Land_Sea_Flag Land_Sea_Flag( 0 = Ocean, 1 = Land ) N/A int16 -9999 N/A N/A N/A
geophysical_data/Mean_Gas_Corrected_Reflectance Mean reflectance Gas corrected of pixels at 0.48, 0.55, 0.67, 0.87 1.24, 1.64, 2.2 N/A int16 -9999 N/A 9.9999997473788E-5 0
geophysical_data/Mean_Reflectance Mean reflectance (not corrected for GAS ) pixels at 0.354 0.388 N/A int16 -9999 N/A 9.9999997473788E-5 0
geophysical_data/NUV_AerosolCorrCloudOpticalDepth NUV Retrieved Aerosol Corrected Cloud Optical Depth at 0.388 km int16 -9999 N/A 0.10000000149012 0
geophysical_data/NUV_AerosolIndex NUV Retrieved Aerosol Index (0.354,0.388) Pair km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_AerosolLayerHeight NUV Retrieved Aerosol Layer Height km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_AerosolOpticalDepthOverCloud NUV Retrieved Aerosol Optical Depth Over Cloud at 0.354, 0.388, 0.550 N/A int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_AerosolSingleScattAlbedo NUV Retrieved Aerosol Single Scattering Albedo at 0.354, 0.388, 0.480, 0.550, 0.670 N/A int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_CloudOpticalDepth NUV Retrieved Cloud Optical Depth at 0.388 km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_FinalAlgorithmFlagsACA NUV Final Algorithm Flags for Above-cloud retrievals km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_RadiativeCloudFraction NUV derived Radiative Equivalent Cloud Fraction at 0.388 km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_Reflectivity NUV Retrieved LERs at 0.354, 0.388 N/A int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_Residue NUV Retrieved LER based AI (0.354,0.388) Pair km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/NUV_UncertaintyACAODToSSA NUV derived percent uncertainity in Aerosol-corrected COD due to plus/minus 0.03 change in SSA. N/A int16 -9999 N/A 0.10000000149012 0
geophysical_data/NUV_UncertaintyCODToSSA NUV derived percent uncertainity in Aerosol-corrected COD due to plus/minus 0.03 change in SSA. N/A int16 -9999 N/A 0.10000000149012 0
geophysical_data/O2B_AerosolLayerHeight O2-B Retrieved Aerosol Layer Height km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/Optical_Depth_Ratio_Small_Ocean_used Fraction of AOT (at 0.55 micron) contributed by fine mode used for UV retrieval km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/Quality_flag_Aerosol_Optical_Depth Land=0 Ocean,0,1,2,3 km int16 -9999 N/A 0.0010000000474975 0
geophysical_data/Quality_flag_SingleScattAlbedo Quality_flag_SingleScattAlbedo 0,1,2,3 km int16 -9999 N/A 0.0010000000474975 0
scan_line_attributes/HAM_side Half-angle mirror side N/A uint8 255 0 to 1 N/A N/A
scan_line_attributes/scantime scan time seconds since 2025-11-16 float64 -32767 0 to 172802 N/A N/A
scan_line_attributes/scan_quality_flags Scan quality flags none uint8 255 N/A N/A N/A
Wavelength_ACA_UNCER Wavelength_ACA_UNCER nm float32 -32767 N/A N/A N/A
Wavelength_Used Wavelength_Used nm float32 -32767 N/A N/A N/A
Wavelength_Used_AAOD Wavelength_Used_AAOD nm float32 -32767 N/A N/A N/A
Wavelength_Used_all Wavelength_Used_all nm float32 -32767 N/A N/A N/A
Wavelength_Used_DTDB Wavelength_Used_DTDB nm float32 -32767 N/A N/A N/A
Wavelength_Used_UV Wavelength_Used_UV nm float32 -32767 N/A N/A N/A
Wavelength_Used_UV1 Wavelength_Used_UV1 nm float32 -32767 N/A N/A N/A
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