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2013,

Description

Humidity-mixing-ratio profiles averaged over 5 minutes in time and 90 meters in height, respectively, from a combination of Raman lidar and microwave radiometer. The associated error is also included as well as quality flags. Additionally the cloud base altitude from the 1064nm range-corrected signal from the Raman lidar and the truncation altitude are given. Truncation altitude means where the Raman lidar profile is truncated. Usually at the cloud base. When no Raman lidar water vapour measurements are taken (e.g. during daytime) or when the background noise at the 387nm channel is too high, the truncation altitude is set to the surface. Processing: the Raman lidar signal ratio is first calibrated using the integrated water vapour from the microwave radiometer (MWR). Then a Kalman filter is apllied to these profiles to account for measurement disruption (truncated profiles). The profiles are truncated at the cloud base in case of clouds or at the surface in case of daytime when no Raman lidar water vapour measurements are taken. The cloud base and the truncation altitude are given in the according variables. The Kalman filtered profile serves as the input (a priori) to the one-dimensional variational retrieval (optimal estimation method) wherein the MWR observation serves as measurement variable. The optimal estimated profiles are stored in the humidity mixing ratio variable. Periods without water vapour informations, cloud base from lidar, without MWR measurements, flagged MWR observations, rainy periods or when the retrieval does not find a solution, are marked in the flag variable.

Limitations: The errors above the truncation altitude are higher due to the lower amount of vertical information from the Raman lidar. The profiles in the lowermost 600 m may be biased due to the overlap effect.
Provenance: Original Data from Leibniz Institute for Tropospheric Research, Leipzig, processed by LIM, University of Leipzig
Comments: none

• Source: Raman lidar PollyXT and microwave radiometer HATPRO
• Descriptive Instrument location: Both instruments are part of the LACROS facility that was installed on the area of a sewage treatment plant in Krauthausen, south of Juelich during the HOPE campaign.

• PID: de.koeln.rrzk/amd.de.hope/lim.rlmwr00.l4.humr
• Project: HD(CP)2
• Level: 4
• Updated version: 00
• File format: NETCDF3_CLASSIC
• Convention: Based on CF-1.6
• Average File Size Uncompressed: 0.54 Mb
• File name: hope_lim_rlmwr00_l4_humr_v[VV]_[YYYYMMDDhhmmss].nc
• Start: 2013-04-01
• End: 2013-05-31

Name	Dimension	CF standard_name	long_name	Unit
humr	time, height	humidity_mixing_ratio	humidity mixing ratio	1
humr_err	time, height		humidity mixing ratio error	1
zcb	time	cloud_base_altitude	cloud base altitude	m
zsl		altitude	altitude above mean sea level	m

Leipzig Institute for Meteorology

Andreas Foth (andreas.foth@uni-leipzig.de)

Foth et al.,Water vapour profiles from Raman lidar automatically calibrated by microwave radiometer data during HOPE

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 .