de.hamburg.icdc/amd.de.fval/uhh.mwrBL00.l1.tb SAMD v2.2 en FESSTVAL fval_uhh_mwrBL00_l1_tb Brightness temperature, boundary layer scans, Microwave Radiometer Observations during FESSTVaL 2021 DOI:10.25592/uhhfdm.10197 Löhnert, Ulrich (1); Knist, Christine (2); Böck, Tobias (1); Bernhard Pospichal (1) (1) University of Cologne; (2) Affiliation: DWD Lindenberg CF-1.7 where applicable external NETCDF4 de 0.2 daily 1 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 . none Institute of Geophysics and Meteorology, University of Cologne Ulrich Loehnert ulrich.loehnert@uni-koeln.de 2021-05-01 2021-08-31 600 none none Birkholz, FESSTVaL supersite at Gut Hirschaue 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. 1.) Up to two level1 data file types: arbritrary viewing direction (e.g. *mwr00_l1_tb_*) and boundary layer scans (e.g. *mwrBL00_l1_tb_*) 2.) 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 occasionally liquid water path values can be slightly negative due to statistical error. 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 vertical resolution decrease quickly with height from tens of meters close to the surface to hundreds of meters at the top of the ABL.  Use *_mwrBL00_l2_ta_* profiles for the most accurate temperature profile in the ABL. Humidity profiles contain only roughly two independent pieces of information throughout the whole troposphere. RPG HATPRO G2 microwave radiometer HAMHAT 52.2001 14.192 67 none none Short term observations Local observations Instrument groups MWR

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2003 Löhnert, U., and S. Crewell none Radio Science, 38(3), 8041, 2003, doi:10.1029/2002RS002654

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2003 Crewell, S., and U. Löhnert none Sensor accuracy and synergy. Radio Science, 38(3), 8042, 2003, doi:10.1029/2002RS002634

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2007 Crewell, S., and U. Löhnert none IEEE Transactions on Geoscience and Remote Sensing, 45(7), 2195-2201, doi:10.1109/TGRS.2006.888434

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Löhnert, U. and Maier, O. none Atmos. Meas. Tech., 5, 1121-1134, doi:10.5194/amt-5-1121-2012.

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2015 Steinke, S., S. Eikenberg, U. Löhnert, G. Dick, D. Klocke, P. Di Girolamo, and S. Crewell none Atmospheric Chemistry and Physics, Atmos. Chem. Phys., 15, 2675-2692, doi:10.5194/acp-15-2675-2015

Data set

2022 Löhnert, Ulrich; Knist, Christine; Böck, Tobias; Pospichal, Bernhard; none http://doi.org/10.25592/uhhfdm.10198 144 2 14 14 2 10 time time time seconds since 1970-01-01 00:00:00 UTC time_bnds time, nv lat latitude degrees_north lon longitude degrees_east zsl altitude altitude above mean sea level m freq_sb n_freq sensor_band_central_radiation_frequency frequency of microwave channels GHz azi n_angle sensor_azimuth_angle degree ele n_angle sensor elevation angle degree tb time, n_angle, n_freq brightness_temperature brightness temperatures K tb_bias_estimate time, n_angle, n_freq brightness temperatures offset correction subtracted K freq_shift n_freq frequency shift applied to correct measured brightness temperature for frequency offset of microwave radiometer channel 1 tb_absolute_accuracy n_freq systematic calibration uncertainty of brightness temperature, one standard deviation K tb_cov n_freq, n_freq error covariance matrix of brightness temperature channels K*K ta time air_temperature air temperature K pa time air_pressure air pressure Pa hur time relative_humidity relative humidity 1 flag time quality control flags 1