Temeprature Profile (Richard-Assmann-Observatory, Lindenberg, DWD), Microwave Radiometer Observations
DOI:10.25592/uhhfdm.10198
Access
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2021,
Dataset Author
Löhnert, Ulrich (1); Knist, Christine (2); Böck, Tobias (1); Pospichal, Bernhard (1);, Institution: (1) University of Cologne; (2) DWD Lindenberg;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. 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 ocasionally liquid water path values can be slightly negative due to statistical error.
Limitations: Quality: 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 troposhere. All level2 data products are delivered with an uncertainty specification.
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_rt03
Comments:
Instrument 1
- Source: RPG HATPRO G5 microwave radiometer DWDHAT
- Descriptive Instrument location: Richard-Assmann-Observatory, Lindenberg, DWD
- Instruments altitude: 98 [m]
- Coordinates (Latitude, Longitude): 52.2085 °N 14.118 °E
- Height: 0 - 10000 [m]
- Horizontal resolution: none [m]
- Vertical resolution: 50 - 500 [m]
- Time resolution: 1.3 [s]
Global information
- PID: de.hamburg.icdc/amd.de.fval/dwd.mwr00.l2.ta
- Standard: SAMD v2.2, https://doi.org/10.25592/uhhfdm.9902
- Project: FESSTVAL
- Level: 2
- Updated version: 00
- File format: NETCDF4
- Convention: CF-1.6
- Average File Size Uncompressed: 28 Mb
- File name: fval_dwd_mwr00_l2_ta_v[VV]_[YYYYMMDDhhmmss].nc
- Start: 2021-05-01
- End: 2021-09-20
Variables
| Name | Dimension | CF standard_name | long_name | Unit |
|---|---|---|---|---|
| ta | ('time', 'height') | air_temperature | K | |
| ta_err | ('height', 'n_ret') | standard error of temperature | K | |
| ta_offset | ('time', 'height') | air_temperature offset correction based on brightness temperature offset | K | |
| zsl | altitude | altitude above mean sea level | m |
Institution
Contact Person(s)
Ulrich Loehnert (ulrich.loehnert@uni-koeln.de), Institute of Geophysics and Meteorology, University of Cologne
Christine Knist (christine.knist@dwd.de), DWD
References
Loehnert, 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