Development of a European pilot network of stations for observing cloud profiles

CloudNET is an EU-funded project to use data obtained quasi-continuously at three remote sensing stations for the development and implementation of cloud remote sensing synergy algorithms. Each site is equipped with radar, lidar and a suite of passive instrumentation. The observations will be used in the evaluation of four operational numerical models, and to demonstrate the role that could be played by an operational network of cloud remote sensing stations. Beside Cabauw the other two experimental research sites are Chilbolton (UK) and Palaiseau (FR). We will also be exploiting the extensive existing datasets from numerous observational campaigns that have already taken place. The project started on 1st of April 2001 and will end on 1st April 2005.

For a full description of the CloudNET project you should visit the CloudNET web site at University of Reading

Near real-time quicklooks are now available for some of the instruments

KNMI's contribution to the CloudNET project


The measurements collected at Cabauw and a number of other stations are stored in a local database maintained at the KNMI. The data are stored and processed from the 1st of October 2001 onwards. The KNMI CloudNET database has restricted access, non CloudNET participants should apply for a user code and password. The database holds presently level 1 data and the concurrent quicklooks. The structure of the database has been set-up based on the different instruments. The data and quicklooks are stored in daily files and for each month in a separate directory.

The directory contents as of the last update of this file:

CT12 (ceilometer: single cloudbase)
CT75 (ceilometer: up to 3 cloudbases, backscatter)
Fluxes (long and short wave radiative fluxes at surface)
IRR (infrared radiometer: sky brightness temperature)
LD40 (ceilometer: up to 3 cloudbases)
MICCY (microwave radiometer Univ. Bonn: LWP, IWV)
Radiosonde (RS-90 radiosonde)
Synop (surface measurements: P, T, RH, rainrate and duration)
Total Sky Imager ("fish-eye" sky images, cloud fraction)
35GHz Cloudradar (backscatter, vertical speed, spectral width)
3 GHz Radar (FMCW radar TU-Delft: backscatter, vertical speed, spectral width)
Cloud Video (video image file (reduced size))

VCR and TSI are recording in daytime only

To be included:

RIVM Lidar (cloudbases)
Windprofiler (backcatter, vertical profiles of windspeed and direction)
GPS (Integrated Water Vapour)

Other information:

Status information (present status of database and systems)
Station details (lon, lat, height and instruments on site)

This site is maintained by Henk Klein Baltink