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

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.

Data and Resources

Additional Info

Field Value
Last Updated October 9, 2019, 18:25
Created March 15, 2018, 14:35
access_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].", "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.", "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."]
bbox-east-long 6.2995
bbox-north-lat 81.3282
bbox-south-lat -81.3282
bbox-west-long -156.2995
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2018-02-22"}]
frequency-of-update continual
graphic-preview-description Example of the Cloud Particle Size product as generated by the GOES-R Cloud Optical and Microphysical Properties algorithm.
graphic-preview-type JPEG
guid gov.noaa.ncdc:C01509
licence ["For a complete description of use limitations for this baseline level 2 product, see the Algorithm Theoretical Basis Document (ATBD)."]
metadata-date 2019-09-27
progress onGoing
resource-type dataset
responsible-party [{"name": "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-156.2995, -81.3282], [6.2995, -81.3282], [6.2995, 81.3282], [-156.2995, 81.3282], [-156.2995, -81.3282]]]}
spatial-reference-system urn:ogc:def:crs:EPSG::4326
spatial_harvester true
temporal-extent-begin 2017-06-08