Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset

Abstract:
Attenuated backscatter profiles from the CALIOP satellite lidar are used to estimate cloud base heights of lower-troposphere liquid clouds (cloud base height below approximately 3 km). Even when clouds are thick enough to attenuate the lidar beam (optical thickness > 5), the technique provides cloud base heights by treating the cloud base height of nearby thinner clouds as representative of the surrounding cloud field. Using ground-based ceilometer data, uncertainty estimates for the cloud base height product at retrieval resolution are derived as a function of various properties of the CALIOP lidar profiles. Evaluation of the predicted cloud base heights and their predicted uncertainty using a second, statistically independent, ceilometer dataset shows that cloud base heights and uncertainties are biased by less than 10%. CBASE provides two files for each CALIOP VFM input file: one using a 40 km window to detect the cloud field base height, and one using a 100 km window. (The input CALIOP VFM dataset is organized by the daytime/nighttime half of each orbit.) The file name pattern is CBASE<resolution>_<date>T<time><day/night>.nc (identical to the input CALIOP VFM file name with the exception of the product name). Files are organized into subdirectories by half-orbit start date.

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Metadata Information

General

General information section
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fileIdentifier/identifierde.dkrz.wdcc.iso3590248
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  • CBASE
contactsee section contact (role: pointOfContact)
dateStamp 2020-04-23T05:23:19
metadataStandardNameISO 19115
metadataStandardVersionISO 19139 / DKRZ ISO Simple Profile V1.0
referenceSystemInfo
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identificationInfo

Identification information section
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citation
  • title:
    • Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset
  • dates:
    • creation: 2018-04-10
  • fileIdentifier:
    • Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset
      (CodeSpace: doi:10.1594/WDCC/CBASE)
  • citedResponsibleParty:
    • see section contact (role: distributor)
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    • doi:10.1594/WDCC/CBASE
abstract see above
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pointOfContactsee section contact (role: originator)
graphicOverview
resourceMaintenance
  • maintenanceAndUpdateFrequency:
  • updateScope:
  • maintenanceNote:
descriptiveKeywords:
  • theme:
    • cloud base
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languageeng
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Contact

Role: pointOfContact

Contact information section
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individualNameJohannes Mülmenstädt
organisationNameUniversität Leipzig
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  • address:


  • email:

Role: distributor

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    Originator information section
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    organisationNameUniversität Leipzig
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    contentInfo

    Content information section
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    CoverageDescription:
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      • cloud_base_altitude
    • contentType
      • modelResult

    distributionInfo

    Distribution information section
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      • tar-File(s)
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      • tar-File(s) (gco:nilReason=)
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