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The Jülich ObservatorY for Cloud Evolution (JOYCE) is operated jointly by the University of Cologne, the Research Centre Jülich. JOYCE was originally operated in the frame of the Transregional Collaborative Research Centre “Patterns in Soil-Vegetation-Atmosphere-Systems: Monitoring, Modelling and Data Assimilation” (TR32). Today, JOYCE is part of the Cloud and Precipitation Exploration Laboratory (CPEX-LAB), a competence centre within the Geoverbund ABC/J.

The official site is or

Scientific Goals

JOYCE instrumentation aims to observe spatial and temporal variability of atmospheric water cycle variables.

Specific goals are

  • to disentangle water vapor variations due to advection and to local surface influence
  • to better understand the development of boundary layer clouds
  • to analyse cloud radiation interaction
  • to observe precipitation formation


Most instruments are located on the roof of the Institute for Energy and Climate Research - Troposphere IEK-8 at the Research Centre Jülich which is embedded in an agricultural dominated landscape.

  • Latitude: 50°54'30.77“ N = 50.908547°N
  • Longitude: 6°24'48.73” E = 6.413536°E
  • Altitude: 111 m asl (20 m above ground)
  • WIGOS ID : 0-276-0-10508

JOYCE Instruments

Microwave radiometers

Cloud radars


Precipitation observations

Passive solar/infrared observations

Additional instrumentation

Data availability

JOYCE provides a number of resources, which characterize the thermodynamic state of the atmospheric column including vertical profiles of temperarture, humidity and cloud macro- and microphysical properties as well as the aerosol loading. The data is freely accessible for scientific and educational purposes and may be obtained through direct contact to Bernhard Pospichal.

If you use JOYCE data in publications, please use following phrase in the acknowledgement:

JOYCE data were provided by the Cloud and Precipitation Exploration Laboratory (CPEX-LAB,, a competence centre within the Geoverbund ABC/J.

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sites/joyce.txt · Last modified: 2024/02/16 18:51 by jan