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  • PACE OCI Level-2 Regional Aerosol Optical Properties, Unified Aerosol Algorithm (UAA) Algorithm Data, version 3.1

    https://cmr.earthdata.nasa.gov/search/concepts/C3620139465-OB_CLOUD.xml
    Description:

    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)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_AER_UAA Version ID: 3.1 Unique ID: C3620139465-OB_CLOUD

  • PACE OCI Level-2 Regional Apparent Optical Properties - Near Real-time (NRT) Data, version 3.2

    https://cmr.earthdata.nasa.gov/search/concepts/C4124887001-OB_CLOUD.xml
    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 Apparent Optical Properties (OC_AOP) data suite provides satellite-derived measures of the interaction between solar radiation and the upper ocean. AOPs are "apparent" because they depend not only on the inherent optical properties (IOPs) of seawater and its constituents but also on the ambient light field. These variables are critical for studying light penetration, primary productivity, and biogeochemical cycling. AVW (Apparent Visible Wavelength) quantifies the spectral "center" of ocean color by summarizing the shape of the water-leaving reflectance spectrum (Rrs) across the visible range. Reported in nanometers (nm), AVW is lower for bluer, clearer (oligotrophic) waters and higher for greener/browner, more optically complex or productive waters influenced by phytoplankton, colored dissolved organic matter (CDOM), or suspended sediments. Users apply AVW for water-type classification, algorithm selection/blending (e.g., guiding chlorophyll retrievals), regional change detection, and as context alongside chlor_a, Kd_490, IOPs, and PAR. Fluorescence Line Height (FLH) quantifies the red chlorophyll-a fluorescence (~678-683 nm) emitted by phytoplankton, computed as the height of the measured water-leaving radiance above a spectrally interpolated baseline. FLH is widely used for HAB detection and tracking, identifying productive waters, and assessing phytoplankton physiology; values tend to be elevated in active blooms and can be reduced in complex waters. Aerosol Optical Thickness (AOT) represents the column-integrated aerosol loading in the atmosphere, describing the attenuation of light due to scattering and absorption by aerosols. AOT is a key parameter in atmospheric correction and is also used to study aerosol transport, air quality, and aerosol-ocean interactions. Remote Sensing Reflectance (Rrs) provides the remote sensing reflectance at wavelength λ (nm) - the ratio of water-leaving radiance to downwelling irradiance just above the surface (units sr^-1). Variables are named by their band center (e.g., Rrs_412, Rrs_443). Rrs_λ is the foundational observable used to retrieve products such as chlor_a, Kd_490, IOPs, and to support algorithm development, validation, water-quality, and ecosystem applications. Users should review per-file quality flags (e.g., land, cloud, sun glint, high aerosol) and mission documentation - especially in optically complex coastal/inland waters. As with all ocean-color retrievals, uncertainties increase in optically complex coastal/inland waters or under high aerosol/glint; users should refer to per-mission algorithm notes and quality flags before analysis. Usage notes: - Rrs and Rrs_unc are stored as scaled integers; use the scale_factor and add_offset attributes to obtain physical values. - Quality control should use l2_flags per the flag_meanings attribute to mask clouds, land, high glint, and other conditions. Geophysical variables in this suite include: - Rrs - Remote sensing reflectance (sr^-1) - aot_865 - Aerosol optical thickness at 865 nm (unitless) - angstrom - Aerosol Angstrom exponent, 443-865 nm (unitless) - avw - Apparent Visible Wavelength (nm) - nflh - Normalized Fluorescence Line Height (W m^-2 um^-1 sr^-1) - l2_flags — Level-2 processing flags (bitmask; see per-variable attributes for flag_masks and flag_meanings) - Rrs_unc - Uncertainty in remote sensing reflectance (sr^-1)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_AOP_NRT Version ID: 3.2 Unique ID: C4124887001-OB_CLOUD

  • PACE OCI Level-2 Regional Cloud Mask Data, version 3.1

    https://cmr.earthdata.nasa.gov/search/concepts/C3620139782-OB_CLOUD.xml
    Description:

    The Cloud Mask identifies whether pixels are cloud-covered or not. This is important because algorithms to determine cloud properties should only run on cloudy pixels, and other algorithms that require clear-sky pixels need to screen clouds out. In practice, users apply cloud_flag for strict cloud removal and cloud_flag_dilated when they want a conservative mask that reduces cloud-edge artifacts in downstream products (e.g., Rrs, chlorophyll). The CLDMASK is used operationally as the "cloud and cloud-adjacent" screen. Core geophysical variables in this suite include: - cloud_flag - Cloud mask (bitmask; identifies cloud-contaminated pixels) - cloud_flag_dilated - Cloud or cloud-adjacent pixel mask (bitmask; includes surrounding pixels) - l2_flags - Level-2 Processing Flags (bitmask)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_CLOUD_MASK Version ID: 3.1 Unique ID: C3620139782-OB_CLOUD

  • PACE OCI Level-2 Regional Trace Gas Concentrations (NO2, O3) Data, version 3.0

    https://cmr.earthdata.nasa.gov/search/concepts/C3993527322-OB_CLOUD.xml
    Description:

    The Trace Gas Concentrations (TRGAS) suite provides key atmospheric column constituents. These trace-gas fields support both atmospheric science (e.g., air-quality and chemistry studies) and ocean-color atmospheric correction. Users should apply the quality and L2 flags to screen cloud effects, high solar-zenith conditions, and other retrieval issues before analysis. Geophysical variables in this suite include: - total_column_no2 – total vertical column nitrogen dioxide (molecules cm⁻²) - total_column_o3– total vertical column ozone (Dobson units) - l2_flags – processing flags (dimensionless) - no2_bit_flags – NO₂ processing flags (dimensionless) - quality_no2 – NO₂ quality flags (dimensionless) - o3_bit_flags – O₃ processing flags (dimensionless) - quality_o3 – O₃ quality flags (dimensionless)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_TRGAS Version ID: 3.0 Unique ID: C3993527322-OB_CLOUD

  • PACE OCI Level-1C Science Data, version 3

    https://cmr.earthdata.nasa.gov/search/concepts/C3392966961-OB_CLOUD.xml
    Description:

    Level 1C (L1C) data are Level 1B (L1B) data that include new variables to describe the spectra. These variables allow the user to identify which L1C channels have been copied directly from the L1B and which have been synthesized from L1B and why.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L1C_SCI Version ID: 3 Unique ID: C3392966961-OB_CLOUD

  • PACE OCI Level-2 Regional Cloud Optical Properties Data, version 3.1

    https://cmr.earthdata.nasa.gov/search/concepts/C3620139813-OB_CLOUD.xml
    Description:

    The CLOUD data suite provides per-pixel microphysics and macrophysics to support cloud/climate applications. Typical uses: screening clouds for atmospheric correction, evaluating cloud–radiation interactions, and joint analyses with ocean-color variables (e.g., chlorophyll, Rrs). * NOTE - All CLOUD L2 and L3 files with acquisition dates on or after May 1, 2026, include the following additional products cer_16_21, cwp_16_21, cot_16_21. These products will be extended to the full mission record during a future reprocessing of the OCI CLOUD L2 and L3 product suites. Core geophysical variables in this suite include: - cloud_fraction — Cloud fraction (unitless; 0–1) - ice_cloud — Ice cloud fraction (unitless; 0–1) - water_cloud — Water cloud fraction (unitless; 0–1) - cer_16 / cer_21 / cer_22 — Cloud particle effective radius (µm) retrieved from two-channel methods using near-IR bands (1.6, 2.1, or 2.2 µm) paired with a non-absorbing band - cot_16 / cot_21 / cot_22 — Cloud optical thickness (unitless) retrieved from two-channel methods using near-IR bands - cwp_16 / cwp_21 / cwp_22 — Cloud water path (g m⁻²) retrieved from two-channel methods using near-IR bands - cth — Cloud top height (m) - ctp — Cloud top pressure (hPa) - ctt — Cloud top temperature (K) - l2_flags — Level-2 Processing Flags (bitmask; see product attributes for definitions)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_CLOUD Version ID: 3.1 Unique ID: C3620139813-OB_CLOUD

  • PACE OCI Level-2 Regional Cloud Mask - Near Real-time (NRT) Data, version 3.1

    https://cmr.earthdata.nasa.gov/search/concepts/C3620139761-OB_CLOUD.xml
    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 Cloud Mask identifies whether pixels are cloud-covered or not. This is important because algorithms to determine cloud properties should only run on cloudy pixels, and other algorithms that require clear-sky pixels need to screen clouds out. In practice, users apply cloud_flag for strict cloud removal and cloud_flag_dilated when they want a conservative mask that reduces cloud-edge artifacts in downstream products (e.g., Rrs, chlorophyll). The CLDMASK is used operationally as the "cloud and cloud-adjacent" screen. Core geophysical variables in this suite include: - cloud_flag - Cloud mask (bitmask; identifies cloud-contaminated pixels) - cloud_flag_dilated - Cloud or cloud-adjacent pixel mask (bitmask; includes surrounding pixels) - l2_flags - Level-2 Processing Flags (bitmask)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_CLOUD_MASK_NRT Version ID: 3.1 Unique ID: C3620139761-OB_CLOUD

  • PACE OCI Level-2 Regional Ocean Color Inherent Optical Properties (OC_IOP) Data, version 3.2

    https://cmr.earthdata.nasa.gov/search/concepts/C4124887265-OB_CLOUD.xml
    Description:

    The Ocean Color Inherent Optical Properties suite (OC_IOP) provides per-pixel, satellite-derived derived measures of inherent optical properties (IOPs) in the upper ocean. IOPs describe how seawater and its constituents absorb and scatter light, independent of illumination or viewing geometry. IOPs are retrieved from spectral remote sensing reflectance (Rrs) using the default configuration of the Generalized Inherent Optical Properties (GIOP-DC) model framework. The spectral diffuse attenuation coefficient of downwelling irradiance (Kd) is also included in the IOP_OC suite. Kd is an apparent optical property (AOP) that is derived from IOPs using the Lee bio-optical model. Kd describes how visible light diminishes with depth in the ocean. These products support water-type classification, water-clarity assessment, biogeochemical studies, and forward/adjoint radiative-transfer applications, and they enable more robust cross-sensor comparisons than purely AOP products. The hyperspctral band list is found in the science data file metadata. Geophysical variables in this suite include: - Kd - Diffuse attenuation coefficient of downwelling irradiance (m^-1) - a - Total absorption coefficient (sum of pure water + phytoplankton + CDOM/detritus, m^-1) - bb - Total backscattering coefficient (m^-1) - aph - Phytoplankton absorption coefficient (m^-1) - aph_unc_442 - Uncertainty in absorption due to phytoplankton at 442 nm (m^-1) - adg_442 - Combined CDOM + non-algal detritus absorption coefficient at 442nm (m^-1) - adg_unc_442 - Uncertainty in absorption due to gelbstoff and detrital material at 442 nm (m^-1) - bbp_442 - Particulate backscattering coefficient at 442nm (m^-1) - bbp_unc_442 - Uncertainty in particulate backscattering at 442 nm (m^-1) - rrsdiff - Fractional mean Rrs difference (reconstructed from inverted IOPs - input) (unitless) - l2_flags - Level-2 processing flags (bitmask; see per-variable attributes for flag_masks and flag_meanings)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L2_IOP Version ID: 3.2 Unique ID: C4124887265-OB_CLOUD

  • PACE OCI Level-3 Global Mapped Apparent Optical Properties Data, version 3.2

    https://cmr.earthdata.nasa.gov/search/concepts/C4184125822-OB_CLOUD.xml
    Description:

    The Apparent Optical Properties (OC_AOP) data suite provides satellite-derived measures of the interaction between solar radiation and the upper ocean. AOPs are "apparent" because they depend not only on the inherent optical properties (IOPs) of seawater and its constituents but also on the ambient light field. These variables are critical for studying light penetration, primary productivity, and biogeochemical cycling. AVW (Apparent Visible Wavelength) quantifies the spectral "center" of ocean color by summarizing the shape of the water-leaving reflectance spectrum (Rrs) across the visible range. Reported in nanometers (nm), AVW is lower for bluer, clearer (oligotrophic) waters and higher for greener/browner, more optically complex or productive waters influenced by phytoplankton, colored dissolved organic matter (CDOM), or suspended sediments. Users apply AVW for water-type classification, algorithm selection/blending (e.g., guiding chlorophyll retrievals), regional change detection, and as context alongside chlor_a, Kd_490, IOPs, and PAR. Fluorescence Line Height (FLH) quantifies the red chlorophyll-a fluorescence (~678-683 nm) emitted by phytoplankton, computed as the height of the measured water-leaving radiance above a spectrally interpolated baseline. FLH is widely used for HAB detection and tracking, identifying productive waters, and assessing phytoplankton physiology; values tend to be elevated in active blooms and can be reduced in complex waters. Aerosol Optical Thickness (AOT) represents the column-integrated aerosol loading in the atmosphere, describing the attenuation of light due to scattering and absorption by aerosols. AOT is a key parameter in atmospheric correction and is also used to study aerosol transport, air quality, and aerosol-ocean interactions. Remote Sensing Reflectance (Rrs) provides the remote sensing reflectance at wavelength λ (nm) - the ratio of water-leaving radiance to downwelling irradiance just above the surface (units sr^-1). Variables are named by their band center (e.g., Rrs_412, Rrs_443). Rrs_λ is the foundational observable used to retrieve products such as chlor_a, Kd_490, IOPs, and to support algorithm development, validation, water-quality, and ecosystem applications. Users should review per-file quality flags (e.g., land, cloud, sun glint, high aerosol) and mission documentation - especially in optically complex coastal/inland waters. As with all ocean-color retrievals, uncertainties increase in optically complex coastal/inland waters or under high aerosol/glint; users should refer to per-mission algorithm notes and quality flags before analysis. Usage notes: - Rrs and Rrs_unc are stored as scaled integers; use the scale_factor and add_offset attributes to obtain physical values. - Quality control should use l2_flags per the flag_meanings attribute to mask clouds, land, high glint, and other conditions. Geophysical variables in this suite include: - Rrs - Remote sensing reflectance (sr^-1) - aot_865 - Aerosol optical thickness at 865 nm (unitless) - angstrom - Aerosol Angstrom exponent, 443-865 nm (unitless) - avw - Apparent Visible Wavelength (nm) - nflh - Normalized Fluorescence Line Height (W m^-2 um^-1 sr^-1)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L3M_AOP Version ID: 3.2 Unique ID: C4184125822-OB_CLOUD

  • PACE OCI Level-3 Global Mapped Land Vegetation Indices Data, version 3.1

    https://cmr.earthdata.nasa.gov/search/concepts/C3620140363-OB_CLOUD.xml
    Description:

    LANDVI suite provides vegetation and land-surface indices derived from surface reflectance. Six of the indices are heritage, and four are hyperspectral-enabled. Users should see documentation for more details. Users should also note that the L3M product is masked for clouds. Geophysical variables in this suite include: - ndvi — Normalized Difference Vegetation Index (unitless) - evi — Enhanced Vegetation Index (unitless) - cire — Chlorophyll Index Red Edge (unitless) - pri — Photochemical Reflectance Index (unitless) - car — Carotenoid Content Index (unitless) - cci — Chlorophyll–Carotenoid Index (unitless) - mari — Anthocyanin Reflectance Index (unitless) - ndii — Normalized Difference Infrared Index (unitless) - ndwi — Normalized Difference Water Index (unitless) - ndsi — Normalized Difference Snow Index (unitless)

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    OB_CLOUD Short Name: PACE_OCI_L3M_LANDVI Version ID: 3.1 Unique ID: C3620140363-OB_CLOUD