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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 |
INSPIRE
Identification
- File identifier
- wdc-climate.de:3590248 XML
- Hierarchy level
- collection collection
Online resource
Resource identifier
- code
- CBASE
- code
- doi:10.1594/WDCC/CBASE
- Metadata language
- eng; USA
Encoding
- Format
- tar-File(s)
Projection
Classification of data and services
Classification of data and services
Coupled resource
Coupled resource
Classification of data and services
Coupled resource
Coupled resource
Keywords
Other keywords
- Keywords
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- cloud base
- Keywords
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- lidar
Geographic coverage
))
Temporal reference
Temporal extent
Temporal extent
- Date ( Publication )
- 2018-04-17
Quality and validity
Conformity
Conformity
Conformity
Conformity
Conformity
Conformity
Restrictions on access and use
Restrictions on access and use
Responsible organization (s)
Contact for the resource
- Organisation name
- Pacific Northwest National Laboratory
Responsible organization (s)
Contact for the resource
- Organisation name
- Pacific Northwest National Laboratory
Metadata information
Contact for the metadata
- Organisation name
- Pacific Northwest National Laboratory
- Organisation name
- Pacific Northwest National Laboratory
- Date stamp
- 2018-04-10T09:41:38
- Metadata language
- eng; USA
SDS
Conformance class 1: invocable
Access Point URL
Endpoint URL
Technical specification
Conformance class 2: interoperable
Coordinate reference system
Quality of Service
Access constraints
Limitation
Use constraints
Limitation
Responsible custodian
Contact for the resource
Conformance class 3: harmonized
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