My GeoNetwork catalogue
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.
- Identification
- Distribution
- Quality
- Spatial rep.
- Ref. system
- Content
- Portrayal
- Metadata
- Md. constraints
- Md. maintenance
- Schema info
Identification
Data identification
Citation
- Alternate title
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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
- Date (Creation)
- 2018-04-10
- Citation identifier
- None
- Citation identifier
- doi:10.1594/WDCC/CBASE / Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset
- Other citation details
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doi:10.1594/WDCC/CBASE
- Theme
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lidar
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- Theme
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cloud base
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- Language
- English
Extent
))
- Begin date
- 2007-01-01
- End date
- 2008-12-31
Distribution
Distribution
- Distribution format
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tar-File(s)
(
tar-File(s)
)
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tar-File(s)
(
tar-File(s)
)
Distributor
Digital transfer options
Quality
- Hierarchy level
- Series
Content
Coverage Description
- Attribute description
- cloud_base_altitude
- Content type
- modelResult
- Descriptor
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m
Coverage Description
- Attribute description
- cloud_base_altitude
- Content type
- modelResult
- Descriptor
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n/a
Metadata
Metadata
- File identifier
- de.dkrz.wdcc.iso3590248 XML
- Hierarchy level
- Series
- Hierarchy level name
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CBASE
- Date stamp
- 2022-04-25T04:36:00
- Metadata standard name
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ISO 19115
- Metadata standard version
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ISO 19139 / DKRZ ISO Simple Profile V1.0
- Dataset URI
Overviews
Spatial extent
Provided by
