wdc-climate.de:3590248 eng; USA collection CBASE Johannes Mülmenstädt Pacific Northwest National Laboratory not filled pointOfContact Johannes Mülmenstädt Pacific Northwest National Laboratory not filled pointOfContact 2018-04-10T09:41:38 ISO 19115 ISO 19115-2:2009 Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset 2018-04-17 publication 1 CBASE doi:10.1594/WDCC/CBASE Johannes Mülmenstädt Universität Leipzig https://meteo.physgeo.uni-leipzig.de Email: johannes.muelmenstaedt@uni-leipzig.de principalInvestigator Johannes Mülmenstädt Universität Leipzig https://meteo.physgeo.uni-leipzig.de Email: johannes.muelmenstaedt@uni-leipzig.de author Odran Sourdeval Universität Leipzig https://meteo.physgeo.uni-leipzig.de author David S. Henderson University of Wisconsin at Madison not filled author Tristan S. L’Ecuyer University of Wisconsin at Madison not filled author Claudia Unglaub Universität Leipzig https://meteo.physgeo.uni-leipzig.de author Leonore Jungandreas Universität Leipzig https://meteo.physgeo.uni-leipzig.de Email: leonore.jungandreas@mpimet.mpg.de author Christoph Böhm Universität zu Köln not filled author Lynn M. Russell University of California, San Diego not filled author Prof. Dr. Johannes Quaas Universität Leipzig https://meteo.physgeo.uni-leipzig.de Email: johannes.quaas@uni-leipzig.de author WDC Climate at DKRZ publisher 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. Johannes Mülmenstädt Pacific Northwest National Laboratory not filled pointOfContact tar-File(s) cloud base lidar CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ eng; USA 0.0 360.0 -90.0 90.0 calendrical 2007-01-01 2008-12-31 cloud_base_altitude (standard_error) not filled; unit: n/a cloud_base_altitude cloud_base refers to the base of the lowest cloud. Altitude is the (geometric) height above the geoid, which is the reference geopotential surface. The geoid is similar to mean sea level. [CF-Standard Name]; unit: m tar-File(s) 203 https://www.wdc-climate.de/ui/entry?acronym=CBASE information collection n/a None n/a None