experimentDOI

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

doi:10.1594/WDCC/CBASE

General Information

Name
Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset
Acronym
CBASE
Project
Cloudbase (Cloudbase: satellite-derived cloud base heights)
Summary
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.
Contact
Johannes Mülmenstädt (
 johannes.muelmenstaedt@nulluni-leipzig.de
)
Keyword(s)
cloud base
Location(s)
World: Longitude 0 to 360 Latitude -90 to 90
Spatial Coverage
Longitude 0 to 360 Latitude -90 to 90
Temporal Coverage
2007-01-01 to 2008-12-31 (calendrical)
Size
193.54 MiB (202936320 Byte)
Format
'tar-File(s)'
Progress
completely archived
Creation Date
2018-04-10
Future Review Date
2028-04-07

Citation

Citation
Mülmenstädt, Johannes; Sourdeval, Odran; Henderson, David S.; L’Ecuyer, Tristan S.; Unglaub, Claudia; Jungandreas, Leonore; Böhm, Christoph; Russell, Lynn M.; Quaas, Johannes (2018). Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset. World Data Center for Climate (WDCC) at DKRZ. https://doi.org/10.1594/WDCC/CBASE

 
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