calibration workshop 2003 bern water vapour radiometers radiometer group (ram) institut für...
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Calibration Workshop 2003 Bern
Water Vapour Radiometers
Radiometer Group (RAM)
Institut für Umweltphysik (IUP)
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Radiometers
• 2 similar H2O 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)
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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 PhysicsUniversidad de los Andes, Venezuela
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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 clearanceGoal:Validation of SCIAMACHY (onboard ENVISAT)
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The MARS Observing Site at Pico Espejo
Building on top of Pico Espejo, 4765 m
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MARSInstruments at Pico Espejo:
• 2 Microwave Radiometers:
WARAM 2 (water vapour radiometer operating at 22 GHz)
MIRA 2 (multi species instrument operating at 268-280 GHz)• DOAS, IUP
• In situ measurements of O3 ,, Meteorological Parameters
Species Alt. range [km]
Accuracy Comments
H2O 25 - 55 0.3 ppm WARAM 2 O3 17 – 55 0.5 ppm MIRA 2 ClO 17 – 55 0.4 ppb MIRA 2 HNO3 17 – 55 1 ppb MIRA 2 N2O 17 – 55 30 ppb MIRA 2 O3 < 2% NO2 < 5% OClO 1*1013 molec/cm2 or 15% IO 1*1013 molec/cm2 or 30% BrO 1*1013 molec/cm2 or 10% HCHO 1*1013 molec/cm2 or 20% H2O
Columns
(free Troposphere
and Stratosphere)
1*1013 molec/cm2 or 4%
DOAS
Columns
(free Troposphere
and Stratosphere)
DOAS
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Measurement and Calibration
• WARAM measurement modi: Totalpower
Reference beam method
• Calibration: Cold load is LN2
• Hot load is an microwave absorber at room temperature• Stable Calibration• Problems: Quality and availability of liquid nitrogen
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WARAM 2
• WARAM 2 Zugspitze
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Spectrum
• Totalpower spectrum at Ny-Alesund (17.09.2002)
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Spectrum
• Totalpower Spectrum at Bremen (25.02.2003)