HD(CP)2 long term observations, wind measurements data of DL - measured vectors -> wind profiles can be estimated (no. 00), by Supersite JOYCE, data version 00
Daily files of Doppler Lidar Doppler beam swing wind data (3-beams)
Access
To get a year dataset please use one of the links below to download the wget script:
2013,
Dataset Author
Anne Hirsikko (anne.hirsikko@fmi.fi), Institution: Research Center Juelich, Institute for Energy and Climate research (IEK-8)Description
In daily data set files following level 2 products are included: (1) 3D wind vector components (u,v,w) (2) wind speed (wspeed): speed of the horizontal wind (3) wind direction (wdir): direction of the horizontal wind (4) error estimations for 3D wind vector components (u,v,w), wind speed and wind direction. Data sources were sups_joy_dlidDBS00_l1_any_v00*.nc files. Before calculating u,v,w, wspeed, and wdir radial, velocity (dv) was masked with quality mask (qdv), and data in clouds were removed by requiring that beta is smaller than 1e-5. Quality mask qwind equals 1 if wspeed and wdir are available. Uncertainty of variables was calculated based on error propagation law, and by taking into account uncertainty of radial velocity. Homogeneous wind filed was assumed.
Limitations: Measurements are only available if backscattering targets like aerosols and cloud droplets are present. Applied beta threshold does not guarantee that all hydrometeors (e.g. rain and ice crystals) are removed from analysis. Uncertainty estimations do not take into account effect of turbulence. Therefore, during convective situation uncertainties of wspeed and wdir are likely higher than given ones, and are indicated by temporally highly varying wind directions.
Provenance: Data of JOYCE, processed by IMGK, University of Cologne
Comments: Processed from Doppler beam swing level 1 data found in HD(CP)2 data base. Three beam wind retrieval. Uncertainty estimate takes into account only radial velocity uncertainty.
Instrument 1
- Source: Doppler lidar (no 17), HALO Photonics
- Descriptive Instrument location: The Doppler lidar is installed at the JOYCE; on the roof of the Institute for Energy and Climate Research, Research Center Juelich.
Global information
- PID: de.koeln.rrzk/amd.de.sups/joy.dlidDBS00.l2.wind
- Project: HD(CP)2
- Level: 2
- Updated version: 00
- File format: NETCDF3_CLASSIC
- Convention: CF-1.6 where applicable
- Average File Size Uncompressed: 3.3 Mb
- File name: sups_joy_dlidDBS00_l2_wind_v[VV]_[YYYYMMDDhhmmss].nc
- Start: 2013-01-01
- End: 2013-09-16
Variables
| Name | Dimension | CF standard_name | long_name | Unit |
|---|---|---|---|---|
| w | time, height | upward_air_velocity | missing | m s-1 |
| wdir | time, height | wind_from_direction | missing | degree |
| wspeed | time, height | wind_speed | missing | m s-1 |
| zsl | altitude | altitude above mean sea level | m |
Institution
Contact Person(s)
Ulrich Loehnert (loehnert@meteo.uni-koeln.de)