Description

The radiation data set contains time series of the downward surface radiation flux densities (short-/longwave) measured at the radiation platform in Lindenberg during the Field Experiment on Sub-mesoscale Spatio-Temporal Variability in Lindenberg (FESSTVaL) from May to August 2021. The Lindenberg Meteorological Observatory – Richard-Aßmann-Observatory supersite is operated by the German national meteorological service (Deutscher Wetterdienst, DWD). Data are level-1 data as 1-minute averages based on 1 Hz sampling organized in daily files. The data set also contains time series of air pressure, precipitation sum, wind speed, wind direction, air temperature, and relative humidiy, measured at the synoptic Lindenberg weather station (10393), also during the Field Experiment on Sub-mesoscale Spatio-Temporal Variability in Lindenberg (FESSTVaL) from May to August 2021. These basic meteorological parameters are level-1 data as 10-minute averages (sums) based on 1 Hz sampling organized in daily files.

Limitations:
Radiation data: Radiation flux sensors are operated in ventilated shields. The uncertainty in the observational period (given as 95 % confidence intervals) is estimated from internal comparisons at ± 4.5 W/m2 (or 2.5 %), ± 5 W/m2 (or 1.5 %), and ± 6.5 W/m2 (or 2 %) for the diffuse, global and direct component, respectively. The longwave uncertainty is less than ± 5 W/m2. In situ calibrations were frequently conducted during the observational period using reference sensors directly traceable to the World Radiometric Reference (WRR) and the World Infrared Standard Group (WISG) for shortwave and longwave radiation, respectively. Quality control follows the recommendations of the WMO baseline surface radiation network (BSRN). It includes absolute value range tests and inter-comparison versus a second independent radiation flux measurement at the same site. The temperature of the emitting sensor surface of the pyrgeometer is checked for plausibility vs. ambient air temperature. Standard deviations are given for all variables listed below. Each measured value is accompanied by a quality flag where 0 = valid, 2 = invalid, 5 = value between extremely rare limits and physically possible limits, 6 = value out of physically possible limits, 9 = value missing.
Basic meteorological paramaters: Data undergo standard quality checks implemented in the DWD synoptic station network. This includes range tests, plausibility tests with respect to neighbouring stations and to temporal changes. For temperature, a second sensor is operated for comparison. Each measured value is accompanied by a quality flag where 0 = data value missing, 1 = good quality, 2 = interpolated or gap-filled by data from an alternative sensor, 3 = dubious quality, 4 = bad quality, 9 = no quality information available. The wind measurements are performed at the top of a hill at the observatory site, the measurement place is surrounded by forest edges at distances of a few decametres to about 100 metres except for winds from SSW to NW, they cannot be considered as representative.
Provenance: none
Comments:

• Standard: SAMD v2.2, https://doi.org/10.25592/uhhfdm.9902
• Project: FESSTVAL
• Level: 1
• File format: NETCDF4
• Convention: CF-1.7 where applicable
• Average File Size Uncompressed: 0.05 Mb
• Start: 2021-05-01
• End: 2021-08-31

Please find further information in the XML files and under DOI: 10.25592/uhhfdm.14218!

Deutscher Wetterdienst, Meteorologisches Observatorium Lindenberg – Richard-Aßmann-Observatorium

Claudia Becker (claudia.becker@dwd.de), Deutscher Wetterdienst, Meteorologisches Observatorium Lindenberg – Richard-Aßmann-Observatorium

Stefan Wacker (stefan.wacker@dwd.de), Deutscher Wetterdienst, Meteorologisches Observatorium Lindenberg – Richard-Aßmann-Observatorium

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 .