NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Particle Size Distribution (CPS)

ABI-L2-CPS

browse graphicExample of the Cloud Particle Size product as generated by the GOES-R Cloud Optical and Microphysical Properties algorithm.
The Cloud Particle Size product contains an image with pixel values identifying a measure of the effective radius of the particles in a single cloud layer. It is defined by the ratio of the third and second moment of the particle size distribution. Separate algorithms are used for daytime, solar zenith angle to 82 degrees, and nighttime, solar zenith angle greater than 82 degrees, conditions. The product is generated in combination with the Cloud Optical Depth product by the same algorithms. The product includes data quality information that identifies whether the daytime or nighttime algorithm generated the pixel, and provides an assessment of the cloud particle size data values for on-earth pixels. The units of measure for the cloud particle size value is microns. Product data is produced under the following conditions for the daytime algorithm: Cloudy; Geolocated source data to local zenith angles of 65 degrees and to solar zenith angles of 82 degrees. Product data generated by the nighttime algorithm is produced under the following conditions: Cloudy; Geolocated source data to local zenith angles of 70 degrees and solar zenith angles between 82 and 180 degrees. The cloud particle size values reported range from 0 to 100 um. However, the size range depends on day/night conditions and the liquid/ice water phase. Cloud Particle Size product data is identified as degraded in the terminator region, which is a solar zenith angle between 65 and 82 degrees for the daytime algorithm, and 82 and 90 degrees for the nighttime algorithm. The measurement range for Cloud Particle Size is determined by the model parameterization used in the algorithm retrieval. For daytime retrievals, the effective radius is determined by the lookup table bounds, 100.4 to 102.0, corresponding to 2.51 to 100 um, for both liquid and ice clouds. For nighttime retrievals, the effective radiance is determined by the range of particle size models considered: 2 to 32 um for water clouds, and; 2.62 to 78.15 um for ice clouds where the retrieval of particle size diameter is related to the effective radius by a quadratic equation.
  • Cite as: GOES-R Algorithm Working Group and GOES-R Program Office, (2018): NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Particle Size Distribution. [indicate subset used]. NOAA National Centers for Environmental Information. [access date].
  • gov.noaa.ncdc:C01509
  • gov.noaa.class:ABIL2PROD
Order Data
Distribution Formats
  • NetCDF (Version: 4)
Distributor Customer Engagement Branch
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
1-828-271-4800
ncei.orders@noaa.gov
Dataset Point of Contact Customer Engagement Branch
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
ncei.sat.info@noaa.gov
Time Period 2017-06-08 to Present (time interval: 15-minute)
Spatial Reference System urn:ogc:def:crs:EPSG::4326
Spatial Bounding Box Coordinates
N: 81.3282
S: -81.3282
E: 6.2995
W: -156.2995
Spatial Coverage Map
General Documentation
Processing Documents
Associated Resources
Publication Dates
  • publication: 2018-02-22
Edition Provisional
Data Presentation Form Digital image
Dataset Progress Status Ongoing - data is continually being updated
Data Update Frequency Continual
Purpose The Cloud Effective Particle Size will be computed using the same algorithm that estimates the Cloud Optical Depth. Using both the visible and near-infrared bands during the day and the infrared bands during the night, the GOES-R Cloud Optical and Microphysical Properties algorithm will retrieve, simultaneously with COD, the Cloud Particle Size. The Cloud Particle Size will provide valuable information about the radiative properties of clouds.
Use Limitations
  • For a complete description of use limitations for this baseline level 2 product, see the Algorithm Theoretical Basis Document (ATBD).
Dataset Citation
  • Cite as: GOES-R Algorithm Working Group and GOES-R Program Office, (2018): NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Particle Size Distribution. [indicate subset used]. NOAA National Centers for Environmental Information. [access date].
Cited Authors
  • GOES-R Algorithm Working Group
  • GOES-R Series Program
Principal Investigators
  • GOES-R Algorithm Working Group
Resource Providers
  • GOES-R Series Program
Publishers
  • NOAA National Centers for Environmental Information
Theme keywords Global Change Master Directory (GCMD) Science Keywords
  • Earth Science > Atmosphere > Clouds > Cloud Microphysics > Particle Size Distribution
Global Climate Observing System (GCOS) Essential Climate Variables (ECVs)
  • Atmospheric - Upper-air - Cloud Properties
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/OSPO > Office of Satellite and Product Operations, NESDIS, NOAA, U.S. Department of Commerce
Platform keywords Global Change Master Directory (GCMD) Platform Keywords
  • GOES-16 > Geostationary Operational Environmental Satellite 16
  • GOES-17 > Geostationary Operational Environmental Satellite 17
Instrument keywords Global Change Master Directory (GCMD) Instrument Keywords
  • ABI > Advanced Baseline Imager
Place keywords Global Change Master Directory (GCMD) Location Keywords
  • Geographic Region > Equatorial
  • Geographic Region > Mid-Latitude
  • Geographic Region > Northern Hemisphere
  • Geographic Region > Southern Hemisphere
  • Geographic Region > Western Hemisphere
  • Geographic Region > Tropics
  • Continent > North America > United States Of America
  • Continent > North America > Central America
  • Continent > South America
  • Ocean > Atlantic Ocean
  • Ocean > Pacific Ocean
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • GOES > Geostationary Operational Environmental Satellites
  • gov.noaa.class:GRABIPRD
Data Resolution keywords Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
  • 1 km - < 10 km or approximately .01 degree - < .09 degree
Global Change Master Directory (GCMD) Temporal Data Resolution Keywords
  • 1 minute - < 1 hour
Stratum keywords Global Change Master Directory (GCMD) Location Keywords
  • Vertical Location > Troposphere
Use Constraints
  • Cite as: GOES-R Algorithm Working Group and GOES-R Program Office, (2018): NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Particle Size Distribution. [indicate subset used]. NOAA National Centers for Environmental Information. [access date].
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Access Constraints
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Fees
  • In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: dataset
Lineage Statement These data were produced by the NOAA Office of Satellite and Product Operations (OSPO) and are archived at the NOAA National Centers for Environmental Information (NCEI).
Processing Steps
  • The Cloud Optical Depth and Cloud Particle Size products are generated by the GOES-R ABI Cloud Microphysical and Optical Properties (COMP) ground processing algorithms for daytime and nighttime. The daytime algorithm employs a physical retrieval based on theoretically computed lookup tables while the nighttime retrieval employs the Community Radiative Transfer Model (CRTM) calculations in an iterative physical retrieval that seeks to minimize the difference between the compute TOA brightness temperature and the observations. The algorithm processes the data pixel-by-pixel, choosing to use the daytime or nighttime approach based on the solar zenith angle threshold value of 82 degrees. The two approaches use different criteria to identify candidate cloudy pixels. The daytime algorithm processes pixels that are identified as cloudy or probably cloudy in the intermediate 4-level cloud mask. In addition to the the intermediate 4-level cloud mask, the nighttime algorithm processes pixels based on the intermediate cloud type product data that is generated by the Cloud Type algorithm. The nighttime processing occurs for any pixel that is identified as cloudy, probably cloudy, or probably clear in the intermediate 4-level cloud mask. However, because the nighttime retrieval requires cloud top temperature product data as input, which is generated only for cloudy, and probably cloud pixels, the nighttime cloud optical depth and particle size are flagged as invalid for pixels identified anywhere the cloud top temperature is invalid. Pixels in the product image with out of range values are assigned the minimum or maximum value in the valid range. The daytime algorithm is limited to local zenith angles below a threshold of 65 degrees. The nighttime algorithm produces degraded quality product data beyond the local zenith angle limit. However, because of the dependency on cloud top temperature, a valid product is restricted to the local zenith angle range for the Cloud Top Temperature product of 70 degrees. The product is generated for all solar zenith angles but is flagged as degraded in the twilight region where the solar zenith angle is between 65 and 82 degrees for the daytime algorithm, and between 82 and 90 degrees for the nighttime algorithm.The Cloud Optical and Microphysical Properties algorithm operates on 2 km pixels, generating an intermediate product at this resolution, but the delivered Cloud Optical Depth product is aggregated to 4 km for the Full Disk coverage region.
  • 2017-06-08T00:00:00 - The GOES-16 ABI Cloud Particle Size Distribution algorithm reached beta maturity.
  • 2018-12-14T00:00:00 - The GOES-16 ABI Cloud Particle Size Distribution algorithm reached provisional maturity.
  • The GOES-16 ABI Cloud Particle Size Distribution algorithm reached full validation maturity.
  • 2018-08-27T00:00:00 - The GOES-17 ABI Cloud Particle Size Distribution algorithm reached beta maturity.
  • The GOES-17 ABI Cloud Particle Size Distribution algorithm reached provisional maturity.
  • The GOES-17 ABI Cloud Particle Size Distribution algorithm reached full validation maturity.
Processing Documents
Source Datasets
  • NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 1b Radiances
    • NCEI landing page for ABI-L1B-RAD
      Source dataset landing page with general information and access links for the dataset.
    • Description of Source: Level 1b radiances
    • Temporal extent used: 2017-02-28 to Present
    • Spatial extent used: N:81.3282 S:-81.3282 E:6.2995 W:-156.2995
Lineage information for: repository
Processing Steps
  • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Last Modified: 2018-12-12
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