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2011, 2012, 2013, 2014, 2015, 2016,

Description

This dataset contains liquid water content calculated by using radar and lidar to identify the liquid cloud base and top in each profile, using the model temperature and pressure to calculate the adiabatic liquid water content in each cloud layer, and then using dual-wavelength microwave radiometers to scale the liquid water content values to yield the correct liquid water path. While this simple partitioning with height is somewhat uncertain, liquid water clouds are frequently thin, occupying only a few vertical model levels, so this dataset is adequate for testing liquid water content in models. The error variable is determined as follows: lwc_error=10*log[ (X+dX)/X ] with X being the measured value and dX being the absolute uncertainty."

Limitations: none
Provenance: none
Comments: This dataset is based on data processed with cloudnet. Cloudnet is member of ACTRIS and data is available for numerous sites in addition to those of HD(CP)2. See http://actris.nilu.no/ for details. There is a distinct data policy agreement between HD(CP)2 and ACTRIS to manage the sharing of datasets between both projects. The nc conventions of the original cloudnet-nc-files were slightly modified to fit HD(CP)2 file conventions. In addition, not all variables of the original cloudnet-nc-files are contained in the HD(CP)2 files. The original comments and global arguments of cloudnet present in the nc files were renamed to *cloudnet_ARGUMENT_NAME*.

• Source: Metek Mira36s cloud radar
• Descriptive Instrument location: The instrument is part of the LACROS facility that is operated in the area around TROPOS in Leipzig.

• Source: Model COSMO-EU
• Descriptive Instrument location: The instrument is part of the LACROS facility that is operated in the area around TROPOS in Leipzig.

• Source: Microwave radiometer HATPRO
• Descriptive Instrument location: The instrument is part of the LACROS facility that is operated in the area around TROPOS in Leipzig.

• Source: Ceilometer Jenoptik CHM15kx
• Descriptive Instrument location: The instrument is part of the LACROS facility that is operated in the area around TROPOS in Leipzig.

• PID: de.koeln.rrzk/amd.de.sups/lac.cln00.l4.cllw
• Project: HD(CP)2
• Level: 4
• Updated version: 00
• File format: NETCDF3_CLASSIC
• Convention: CF-1.6 where applicable
• Average File Size Uncompressed: 20 Mb
• File name: sups_lac_cln00_l4_cllw_v[VV]_[YYYYMMDDhhmmss].nc
• Start: 2011-08-10
• End: 2016-09-23

Name	Dimension	CF standard_name	long_name	Unit
cllw	time, height	mass_concentration_of_cloud_liquid_water_in_air	adiabatically scaled liquid water content	kg m-3
cllw_error	time, height	none	error of adiabatically scaled liquid water content	dB
cllw_retrieval_status	time, height	none	cloud liquid water content retrieval status	1
cllw_th	time, height	none	liquid water content (tophat distribution)	kg m-3
clwvi	time	atmosphere_mass_content_of_cloud_liquid_water	liquid water path	kg m-2
clwvi_error	time	none	error of liquid water path	kg m-2
zsl	none	altitude	Altitude above mean sea level	m

Leibniz Institut for Tropospheric Research (TROPOS), Leipzig, Germany

Patric Seifert (seifert@tropos.de)

Ewan O'Connor,Level 2a Cloudnet product: Liquid water content (linear scaled adiabatic method)

For non-commercial use only. This data is subject to the HD(CP)2/SAMD data policy to be found at https://doi.org/10.25592/uhhfdm.9823  and in the HD(CP)2/SAMD Observation Data Product Standard https://doi.org/10.5281/zenodo.1741363 .