Calibration Workshop 2003 Bern Water Vapour Radiometers Radiometer Group (RAM) Institut für Umweltphysik (IUP)

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Calibration Workshop 2003 Bern Water Vapour Radiometers Radiometer Group (RAM) Institut für Umweltphysik (IUP)

Radiometers 2 similar H 2 O Radiometers 22 GHz Water Vapour line WARAM operating since January 1999 in Ny-Alesund (Spitzbergen) WARAM 2 operating since March 2003 in the Schneefernerhaus at Zugspitze (2650 m) Planned for Mérida (Venezuela)

MARS Mérida Atmospheric Research Station Partners: Institute of Environmental Physics (IUP) University of Bremen, Germany Institut für Meterologie und Klimaforschung (IMK) Forschungszentrum Karlsruhe, Germany Department of Physics Universidad de los Andes, Venezuela

MARS Location of MARS: Pico Espejo near Mérida 8°N, 71°W, 4765 m asl Access by cable car The building is completed Waiting for customs clearance Goal: Validation of SCIAMACHY (onboard ENVISAT)

The MARS Observing Site at Pico Espejo Building on top of Pico Espejo, 4765 m

MARS Instruments at Pico Espejo: 2 Microwave Radiometers: WARAM 2 (water vapour radiometer operating at 22 GHz) MIRA 2 (multi species instrument operating at GHz) DOAS, IUP In situ measurements of O 3,, Meteorological Parameters Columns (free Troposphere and Stratosphere) DOAS

Measurement and Calibration WARAM measurement modi: Totalpower Reference beam method Calibration: Cold load is LN 2 Hot load is an microwave absorber at room temperature Stable Calibration Problems: Quality and availability of liquid nitrogen

WARAM 2 WARAM 2 Zugspitze

Spectrum Totalpower spectrum at Ny-Alesund ( )

Spectrum Totalpower Spectrum at Bremen ( )