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2021,

Description

This data set contains level1 (brightness temperatures) and level2 (retrieved meteorological variables) of the four ground-based microwave radiometers (MWR) measuring during FESSTVaL 2021 (May-August) at Lindenberg (2 MWR, dwd and uzk), Falkenberg (1 MWR, uzk) and Birkholz (1 MWR, uhh). For each MWR you find up to seven data file types. Up to two level1 data file types: arbritrary viewing direction (e.g. *mwr00_l1_tb_*) and boundary layer scans (e.g. *mwrBL00_l1_tb_*) Up to five level2 data file types: path integrated liquid water path (e.g. *_mwr00_l2_clwvi_*), path integrated water vapor (e.g. *_mwr00_l2_prw_*), coarse vertical resolution water vapor profiles (e.g. *_mwr00_l2_hua_*), coarse vertical resolution temperature profiles (*_mwr00_l2_ta_*), ABL temperature profiles (e.g. *_mwrBL00_l2_ta_*) mwr00 (mwr01) file types are on a typical temporal resolution of 1-2 seconds, whereas mwrBL00 (mwrBL01) are on a temporal resolution on the order of minutes (3-15), depending on the instrument. The level2 data sets have been derived by means of multi-variate regression. They rely on long-term radiosonde data sets for training. Note, that ocasionally liquid water path values can be slightly negative due to statistical error. Please reach out Ulrich Loehnert the contact person in case you detect inconsistencies in the data.

Limitations: All data files are provided with quality flags that are described in the netcdf file headers. Exclude flagged data from automatic analyses, for case studies, use flagged data with care and contact the responsible person named in the file header in case of any doubt. Integrated liquid water and water vapor from ground-based MWR are amongst the most accurate methods available. Temperature and humidity profiles are only coarsly resolved in the vertical, are, however, continuously available. Temperature vertic
Provenance: This data has been processed with mwrpro-v04 by University of Cologne. This current SAMD v01 data version now includes file content and naming conventions adjusted to meet the SAMD requirements. In addition improved quality control flags as well as uncertainty estimates have been included.Retrieval version: rao_rt01
Comments:

• Source: RPG HATPRO G2 microwave radiometer HAMHAT
• Descriptive Instrument location: FESSTVaL supersite at Gut Hirschaue, Birkholz, bei Lindenberg, Latitude 52.2085 deg N, Longitude 14.1180 deg E, Height ASL 98 m
• Instruments altitude: 67
• Coordinates (Latitude, Longitude): 52.2001 °N 14.192 °E
• Height: none
• Horizontal resolution: none [m]
• Vertical resolution: none [m]
• Time resolution: none [s]

• PID: de.hamburg.icdc/amd.de.fval/uhh.mwr00.l2.prw
• Standard: SAMD v2.2
• Project: FESSTVAL
• Level: 2
• Updated version: 00
• File format: NETCDF4
• Convention: CF-1.7 where applicable
• Average File Size Uncompressed: 2 Mb
• File name: fval_uhh_mwr00_l2_prw_v[VV]_[YYYYMMDDhhmmss].nc
• Start: 2021-05-01
• End: 2021-08-31

Name	Dimension	CF standard_name	long_name	Unit
prw	time	atmosphere_mass_content_of_water_vapor		kg m-2
prw_err	n_ret		These values denote the standard error of atmosphere mass content of water vapor or off zenith path integrated water vapor at the corresponding retrieval elevation angle.	kg m-2
prw_off_zenith	time		off zenith path integrated water vapor	kg m-2
prw_off_zenith_offset	time		off zenith path integrated water vapor offset correction based on brightness temperature offset	kg m-2
prw_offset	time		atmosphere_mass_content_of_water_vapor offset correction based on brightness temperature offset	kg m-2
zsl		altitude	altitude above mean sea level	m

University of Cologne

Ulrich Loehnert (ulrich.loehnert@uni-koeln.de), Institute of Geophysics and Meteorology, University of Cologne

Löhnert, U., and S. Crewell: Accuraccy of cloud liquid water path from ground-based microwave radiometry. Part I. Dependency on Cloud model statistics., (2003), Radio Science, 38(3), 8041, 2003, doi:10.1029/2002RS002654

Crewell, S., and U. Löhnert: Accuraccy of cloud liquid water path from ground-based microwave radiometry. Part II. Sensor accuracy and synergy., (2003), Radio Science, 38(3), 8042, 2003, doi:10.1029/2002RS002634

Crewell, S., and U. Löhnert: Accuracy of boundary layer temperature profiles retrieved with multi-frequency, multi-angle microwave radiometry., (2007), IEEE Transactions on Geoscience and Remote Sensing, 45(7), 2195-2201, doi:10.1109/TGRS.2006.888434

Löhnert, U. and Maier, O.: Operational profiling of temperature using ground-based microwave radiometry at Payerne: prospects and challenges, (2012), Atmos. Meas. Tech., 5, 1121-1134, doi:10.5194/amt-5-1121-2012

Steinke, S., S. Eikenberg, U. Löhnert, G. Dick, D. Klocke, P. Di Girolamo, and S. Crewell: Assessment of Small-Scale Integrated Water Vapour Variability During HOPE, Atmospheric Chemistry and Physics, (2015), Atmos. Chem. Phys., 15, 2675-2692, doi:10.5194/acp-15-2675-2015

Löhnert, Ulrich; Knist, Christine; Böck, Tobias; Pospichal, Bernhard: Microwave Radiometer Observations during FESSTVaL 2021 (Version 00), (2022), http://doi.org/10.25592/uhhfdm.10198

For non-commercial use only. This data is subject to the FESSTVaL data policy to be found at https://doi.org/10.25592/uhhfdm.9890 and in the SAMD Observation Data Product Standard https://doi.org/10.25592/uhhfdm.9902 .