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Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset
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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Citation proposal
(2018) . Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset. https://gdk.gdi-de.org/geonetwork/srv/api/records/wdc-climate.de:3590248 |
Simple
- Date ( Publication )
- 2018-04-17
- Edition
- 1
- Identifier
- CBASE
- Identifier
- doi:10.1594/WDCC/CBASE
Principal investigator
- Contact instructions
- Email: johannes.muelmenstaedt@uni-leipzig.de
Author
- Contact instructions
- Email: johannes.muelmenstaedt@uni-leipzig.de
Author
- Contact instructions
- Email: leonore.jungandreas@mpimet.mpg.de
Author
Author
Author
- Contact instructions
- Email: johannes.quaas@uni-leipzig.de
Publisher
Point of contact
- Name
- tar-File(s)
- Keywords
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- cloud base
- Keywords
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- lidar
- Use limitation
- CC BY 4.0: Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
- Metadata language
- eng; USA
))
- Distribution format
-
- tar-File(s) ()
- Transfer size
- 203
- OnLine resource
- https://www.wdc-climate.de/ui/entry?acronym=CBASE
- Hierarchy level
- collection collection
Completeness commission
- Name of measure
- n/a
- Measure description
- None
Non quantitative attribute accuracy
- Name of measure
- n/a
- Measure description
- None
gmd:MD_Metadata
- File identifier
- wdc-climate.de:3590248 XML
- Metadata language
- eng; USA
- Hierarchy level
- collection collection
- Hierarchy level name
- CBASE
- Date stamp
- 2018-04-10T09:41:38
- Metadata standard name
- ISO 19115
- Metadata standard version
- ISO 19115-2:2009
Point of contact
Point of contact
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