IODE Ocean Data Portal 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.
Simple
- Alternate title
- 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
- Identifier
- None
- 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
- doi:10.1594/WDCC/CBASE
- Keywords ( Theme )
-
- cloud base
- Metadata language
- engen
))
- Begin date
- 2007-01-01
- End date
- 2008-12-31
- Distribution format
-
-
tar-File(s)
(
tar-File(s)
)
-
tar-File(s)
(
tar-File(s)
)
Distributor
- Hierarchy level
- series Series
- Attribute description
- cloud_base_altitude
- Content type
- modelResult modelResult
- Descriptor
- m
- Attribute description
- cloud_base_altitude
- Content type
- modelResult modelResult
- Descriptor
- n/a
gmd:MD_Metadata
- File identifier
- de.dkrz.wdcc.iso3590248 XML
- Hierarchy level
- series Series
- Hierarchy level name
- CBASE
- Date stamp
- 2019-04-21T20:24:22
- Metadata standard name
- ISO 19115
- Metadata standard version
- ISO 19139 / DKRZ ISO Simple Profile V1.0
- Dataset URI
- http://doi.org/doi:10.1594/WDCC/CBASE
Citation proposal
Johannes Mülmenstädt (Universität Leipzig) - Odran Sourdeval (Universität Leipzig) - David S. Henderson (University of Wisconsin at Madison) - Tristan S. L’Ecuyer (University of Wisconsin at Madison) - Claudia Unglaub (Universität Leipzig) - Leonore Jungandreas (Universität Leipzig) - Christoph Böhm (Universität zu Köln) - Lynn M. Russell (University of California, San Diego) - Dr. Johannes Quaas (Universität Leipzig). Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset.
http://meta.meteo.ru/geonetwork/static/api/records/de.dkrz.wdcc.iso3590248
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