Accuraccy of cloud liquid water path from ground-based microwave radiometry. Part I. Dependency on Cloud model statistics.

de.hamburg.icdc/amd.de.fval/uhh.mwr00.l1.tb SAMD v2.2 en FESSTVAL fval_uhh_mwr00_l1_tb Brightness temperature, 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 7.5 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 . 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. Institute of Geophysics and Meteorology, University of Cologne Ulrich Loehnert ulrich.loehnert@uni-koeln.de 2021-05-01 2021-08-31 none none none FESSTVaL supersite at Gut Hirschaue, Birkholz, bei Lindenberg, Latitude 52.2085 deg N, Longitude 14.1180 deg E, Height ASL 98 m 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. 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 RPG HATPRO G2 microwave radiometer HAMHAT 52.2001 14.192 67 none none 2003 Löhnert, U., and S. Crewell Accuraccy of cloud liquid water path from ground-based microwave radiometry. Part I. Dependency on Cloud model statistics. none Radio Science, 38(3), 8041, 2003, doi:10.1029/2002RS002654 2003 Crewell, S., and U. Löhnert Accuraccy of cloud liquid water path from ground-based microwave radiometry. Part II. Sensor accuracy and synergy. none Radio Science, 38(3), 8042, 2003, doi:10.1029/2002RS002634 2007 Crewell, S., and U. Löhnert Accuracy of boundary layer temperature profiles retrieved with multi-frequency, multi-angle microwave radiometry. none IEEE Transactions on Geoscience and Remote Sensing, 45(7), 2195-2201, doi:10.1109/TGRS.2006.888434 2012 Löhnert, U. and Maier, O. Operational profiling of temperature using ground-based microwave radiometry at Payerne: prospects and challenges none Atmos. Meas. Tech., 5, 1121-1134, doi:10.5194/amt-5-1121-2012 2015 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 none Atmos. Chem. Phys., 15, 2675-2692, doi:10.5194/acp-15-2675-2015 2022 Löhnert, Ulrich; Knist, Christine; Böck, Tobias; Pospichal, Bernhard; Microwave Radiometer Observations during FESSTVaL 2021 (Version 00) none http://doi.org/10.25592/uhhfdm.10198 Short term observations Local observations Instrument groups MWR 45193 2 14 14 1 time time time seconds since 1970-01-01 00:00:00 UTC time_bnds time, nv lat latitude degree_north lon longitude degree_east zsl altitude altitude above mean sea level m freq_sb n_freq sensor_band_central_radiation_frequency frequency of microwave channels GHz azi time sensor_azimuth_angle degree ele time sensor elevation angle degree tb time, n_freq brightness_temperature K tb_bias_estimate time, n_freq brightness temperature offset subtracted from measured brightness temperature K freq_shift n_freq frequency shift applied to correct measured brightness temperature for frequency offset of microwave radiometer channel GHz tb_absolute_accuracy n_freq total calibration uncertainty of brightness temperature, one standard deviation K tb_cov n_freq2, n_freq error covariance matrix of brightness temperature channels K*K wl_irp n_wl_irp infrared pyrometer central wavelength micrometer tb_irp time, n_wl_irp infrared pyrometer brightness temperature K ele_irp time infrared pyrometer elevation angle degree ta time air_temperature air_temperature K pa time air_pressure air_pressure Pa hur time relative_humidity 1 flag time quality control flags none