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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 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).

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)
    ARRAY(0x55e8f4378560)

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
C3620139797-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
42536
Processing Level
2
Published
Updated
Science Keywords
Visible Wavelengths ,
Clouds ,
Cloud Properties ,
Cloud Microphysics ,
Cloud Optical Depth/Thickness

Documents

Publications Citing This Dataset

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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
sensor_band_parameters/Tau_r Rayleigh Optical Thickness N/A float32 -32767 0 to 0.5 N/A N/A
sensor_band_parameters/vcal_gain Vicarious Calibration Gain N/A float32 -32767 0 to 2 N/A N/A
sensor_band_parameters/vcal_offset Vicarious Calibration Offset mW cm^-2 um^-1 sr^-1 float32 -32767 0 to 10 N/A N/A
sensor_band_parameters/wavelength wavelengths nm int32 -32767 0 to 20000 N/A N/A
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