Regional-scale vertical fluxes from an optical-microwave scintillometer during FESSTVAL 2021

Data are level-2 data as 10-minute averages. TableOfContents: Surface Upward Sensible Heat Flux; Surface Upward Sensible Heat Flux Quality Flag; Surface Upward Latent Heat Flux; Surface Upward Latent Heat Flux Quality Flag Technical Info: dimension: 144 x 1; temporalExtent_startDate: 2021-05-01 00:00:00; temporalExtent_endDate: 2021-08-31 23:59:59; temporalResolution: 10; temporalResolutionUnit: minutes; spatialResolution: none; spatialResolutionUnit: none; horizontalResolutionXdirection: none; horizontalResolutionXdirectionUnit: none; horizontalResolutionYdirection: none; horizontalResolutionYdirectionUnit: none; verticalResolution: none; verticalResolutionUnit: meters; horizontalStart: 0; horizontalStartUnit: meters; horizontalEnd: 0; horizontalEndUnit: meters; instrumentNames: BLS-900 optical large aperture scintillometer, MWSC-160 microwave scintillometer; instrumentType: Scintillometer; instrumentLocation: Grenzschichtmessfeld Falkenberg, Lindenberg; instrumentProvider: Scintec AG, Radiometer Physics GmbH

Methods

The fluxes have been derived from simultaneous operation of a BLS-900 large-aperture optical scintillometer and a MWSC-160 microwave scintillometer. Data acquisition, data analysis and flux calculations were performed with the mwsc.exe software package. Structure parameters and the temperature-humidity correlation coefficient (r Tq ) for each 10min time interval have been calculated twice based on different settings, i.e. using the methods described in Hill (1997, doi.org/10.1175/1520-0426(1997)014<0456:AFOASL>2.0.CO;2 ) which assumes a constant rTq = -0.6 at night and rTq = 0.8 during daytime and in Lüdi et al. (2003, doi.org/10.1007/s10546-005-1751-1 ) which calculates r Tq from the cross-correlation of the optical and microwave signals.

The similarity model proposed by Koijmans and Hartogensis (2016, doi.org/10.1007/s10546-016-0152-y ) was then used to derive the heat fluxes from the structure parameters. Using temperature and humidity profile measurements at the Falkenberg tower and measurements of the radiation budget, the deduced fluxes have been checked for sign consistency with the mean gradients of temperature and humidity and for a violation of the energy budget.

In the end “most plausible” fluxes from the two methods (Hill, Lüdi et al. – see above) have been merged to a composite to ensure a better availability / quality of the fluxes especially around sunrise and sunset when the assumptions of the Hill approach typically fail. Quality flags have been assigned to each flux value, where G = good, D = dubious, B = bad, M = missing. Units: Units for all variables (see TableOfContents): W/m²;1;W/m²;1 geoLocations: BoundingBox: westBoundLongitude: 14.1199 degrees East; eastBoundLongitude: 14.1222 degrees East; southBoundLatidude: 52.1665 degrees North; northBoundLatitude: 52.2096 degrees North; geoLocationPlace: Germany, UTM zone 33U Locations: Transmitters: 52.1665 °N, 14.1222 °E, 124 m above mean sea level, 51 m above ground Receivers: 52.2096 °N, 14.1199 °E, 129 m above mean sea level, 26 m above ground Size: Data (level 2 only) are packed into one packed tar-archive.

Its size is roughly 400 Kbyte. Format: netCDF DataSources: Single site ground-based remote sensing, see "Technical Info" for instruments Contact: eileen.paeschke (at) dwd.de Web page: cen.uni-hamburg.de/en/icdc/data/atmosphere/samd-st-datasets/samd-st-fesstval/sups-rao-oms-l2-turb.html see also: cen.uni-hamburg.de/en/icdc/research/samd/observational-data/short-term-observations/fesstval.html