HD(CP)2 long term observations, cloud measurements data of Ceilometer network + seviri (no. 00), full domain observation by GeoMet, Uni Cologne, data version 01
Ceilometer network cloud base altitudes and MSG SEVIRI cloud top altitudes
Access
To get a year dataset please use one of the links below to download the wget script:
2013,
Dataset Author
Sandra Steinke (ssteinke@meteo.uni-koeln.de), Institution: University of Cologne Institute for Geophysics and MeteorologyDescription
Cloud base altitude from ceilometer network for a maximum of three cloud layers. Time steps where an instrument did not measure are flagged with _FillValue. Time steps where an instrument did measure but detected no cloud - either because of clear sky or because the lowest cloud layer was too thick to detect potential cloud layers lying above - are flagged with missing_value. Cloud top altitude from MSG SEVIRI is based on the NWC-SAF (Support to nowcasting and very short range forecasting) retrieval developed at the EUMETSAT Network of Satellite Application Facilities. 5 times 5 pixel surrounding each ceiloeter station are given. The values of latitude and longitude for MSG SEVIRI are centered to the middle of each pixel. The horizontal resolution of MSG SEVIRI over Germany is 6 km in north-south and 4.5 km in east-west direction. time_diff gives the station-dependent temporal difference between MSG SEVIRI measurement and ceilometer measurement in seconds.
Limitations: Second and third cloud layer only detectable by ceilometer if first (lowest) cloud layer is not optically too thick. In a few cases cloud top altitude might be below cloud base altitude: cloud might be optically very thin so that MSG SEVIRI sees ground below and gives too low cloud top height.
Provenance: Data of DWD Ceilometer network, provided by IGMK, University of Cologne; and MSG SEVIRI data recieved from TROPOS
Comments: none
Instrument 1
- Source: MSG SEVIRI
- Descriptive Instrument location: SEVIRI is the main instrument on board Meteosat-9. Meteosat-9 is located in the geostationary orbit at 9.5° E. Ground-based Ceilometer network. For exact location see respective variables in netCDF file
Instrument 2
- Source: Ceilometer network
- Descriptive Instrument location: SEVIRI is the main instrument on board Meteosat-9. Meteosat-9 is located in the geostationary orbit at 9.5° E. Ground-based Ceilometer network. For exact location see respective variables in netCDF file
Instrument 3
- Source: MSG SEVIRI
- Descriptive Instrument location: SEVIRI is the main instrument on board Meteosat-9. Meteosat-9 is located in the geostationary orbit at 9.5° E. Ground-based Ceilometer network. For exact location see respective variables in netCDF file
Global information
- PID: de.koeln.rrzk/amd.de.hdfd/igmk.cmnetsev00.l4.cloud
- Project: HD(CP)2
- Level: 4
- Updated version: 01
- File format: NETCDF3_CLASSIC
- Convention: based on CF-1.6
- Average File Size Uncompressed: 2,7 Mb
- File name: hdfd_igmk_cmnetsev00_l4_cloud_v[VV]_[YYYYMMDDhhmmss].nc
- Start: 2007-01-01
- End: 2013-12-31
Variables
| Name | Dimension | CF standard_name | long_name | Unit |
|---|---|---|---|---|
| stat_id | n_station | station_id | ||
| stat_long | n_station, stat_long_len | station_long_name | ||
| zcb | time, n_station, n_cloudlayer | cloud_base_altitude | cloud base altitude from ceilometer network | m |
| zsl | n_station | altitude | altitude_above_mean_sea_level | m |
Institution
Contact Person(s)
Sandra Steinke (ssteinke@meteo.uni-koeln.de)
Hartwig Deneke (deneke@tropos.de)
References
CEILOMETER CT25K User’s Guide
Derrien, M. and Le Gléau, H.,MSG/SEVIRI cloud mask and type from SAFNWC.
Jenoptik CHM 15k - Nimbus Ceilometer
CEILOMETER CT25K User’s Guide
Derrien, M. and Le Gléau, H.,Algorithm Theoretical Basis Document for “Cloud Products” (CMa-PGE01 v3.2, CT-PGE02 v2.2 & CTTH-PGE03 v2.2)
Derrien, M. and Le Gléau, H.,MSG/SEVIRI cloud mask and type from SAFNWC.