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Description

The Hyper-Angular Rainbow Polarimeter #2 (HARP2) instrument, flying aboard the PACE spacecraft, is a wide-angle imaging polarimeter designed to measure aerosol particles and clouds, as well as properties of land and water surfaces. HARP2 will combine data from multiple along-track viewing angles (up to 60), four spectral bands in the visible and near infrared ranges, and three angles of linear polarization to measure the microphysical properties of the atmospheric particles including their size distribution, amount, refractive indices and particle shape.

Version Description

Reprocessing of Ocean Color (OC) Datasets

Product Summary

Platforms
PACE
Instruments
HARP2
Spatial Extent

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

Geographic Region
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
C3600170036-OB_CLOUD
Data State
ACTIVE
Number of Files/Granules
1242
Processing Level
3
Published
Updated
Science Keywords
Cloud 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 HARP2 Level-3 Mapped Cloud Optical Properties, GPC algorithm Data, version 3.0 [Data set]. NASA Ocean Biology Distributed Active Archive Center. https://doi.org/10.5067/PACE/HARP2/L3M/CLOUD_GPC/3.0 Date Accessed: 2025-12-14

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
cloud_bow_droplet_effective_radius cloud_bow_droplet_effective_radius N/A float32 -32767 3 to 53.400001525879 N/A
cloud_bow_droplet_effective_variance cloud_bow_droplet_effective_variance micron float32 -32767 0.0015000000130385 to 0.5 N/A
cloud_bow_fit_correlation cloud_bow_fit_correlation N/A float32 -32767 -1 to 1 N/A
cloud_bow_rms cloud_bow_rms N/A float32 -32767 0 to 300 N/A
cloud_liquid_index cloud_liquid_index N/A float32 -32767 -10 to 10 N/A
cloud_rft_mode_fraction_0 cloud_rft_mode_fraction_0 micron float32 -32767 0 to 100 N/A
cloud_rft_mode_fraction_1 cloud_rft_mode_fraction_1 micron float32 -32767 0 to 100 N/A
lat lat degrees_north float32 -999 -90 to 90 N/A
lon lon degrees_east float32 -999 -180 to 180 N/A
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