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Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC)
And is signatory of the Mutual Recognition Arrangement by the Committee of
Weights and Measures (CIPM MRA).
The PMOD/WRC is the World Radiation Center of the World Meteorological Organisation,
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PMOD/WRC
PMOD/WRC
Absolute radiometry (ARS)
Infrared radiometry (IRS)
Optical depth WORCC
UV radiometry (WCC-UV)
World Radiation Center
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EMRP-ENV03 “Solar UV”http://projects.pmodwrc.ch/env03/
o Enhance the reliability of spectral solar UV radiation measured at the Earth surfaceo Develop new techniques and devices for traceability better than 2% (now 5%) and for
cost-effective array-spectroradiometer in UV monitoring networks o Intercomparison Campaigns and Workshops
Primary Irradiance Standard Transfer Standard Reference Spectroradiometer
End-User Devices Calibrated UV Network
o Project Coordination: Julian Gröbner, Davos o Duration: 2011 - 2014o Total Budget: 3.9 M€o 8 Partners EU-NMI; 2 Industry; 2 Universities; > 3 Collaborators (Stakeholders)
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Cryogenic radiometer 0.01%Cryogenic radiometer 0.01%
Spectral irradiance standard ~1-3%
Spectral irradiance standard ~1-3%
cw-Laser Sources cw-Laser Sources
Si-trap detector + apertureSi-trap detector + aperture
Filter Radiometer Filter Radiometer
Blackbody + aperture ~0.3% Blackbody + aperture ~0.3%
Detector
Source
SpectroradiometerSpectroradiometer
Spectrally tuneable source Spectrally tuneable source
Spectroradiometer ~5%Spectroradiometer ~5%
Traceability chain for spectral irradiance Wm-2nm-1
Portable transfer standard (used for stability check) ~4%
Portable transfer standard (used for stability check) ~4%
Gröbner & Sperfeld, Metrologia, 2006
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Validation of the QASUME irradiance reference at PTBBlackbody BB3200pg at PTB
Gröbner J., and P. Sperfeld, Direct traceability of the portable QASUME irradiance scale to the primary irradiance standard of the PTB, Metrologia, 42, 134—139, 2005.
QASUME Validation at PTB in 2004 and 2013
±1.2%
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Quality site audit with the QASUME reference spectroradiometer
UV Quality Assurance Program
Status 2002 - 2013•63 site visits•34 sites•>150 spectroradiometer intercomparisons
http://www.pmodwrc.ch/euvc/euvc.php?topic=qasume_audit
Ny Ålesund, Spitzbergen, 2009
RBCC-E, 2005-2013
QASUME
Gröbner et al., Appl. Opt. 2005Gröbner et al., Metrologia, 2006
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RBCC-E @ El Arenosillo“The sunny place”
1999, 2005, 2007, 2009, 2011, 2013
2005
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Daily ratios to QASUME: The ideal case
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Brewer cosine error
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Brewer cosine error
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Single Brewer Stray light
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Brewer Temperature dependency
6%
Temp. coefficient -0.3 %/K
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Summary from 6th RBCC-E (2011)
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Wavelength scale
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What needs to be addressed?
Temperature dependency
Absolute calibration
Wavelength dispersion
Single Brewer Stray Light
Angular ResponseApply Correction, or better:Entrance optic
modification
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Presentations, Guidelines, Publications can be found at the project web-site: http://projects.pmodwrc.ch/env03/
Spectral solar UV Intercomparison at Davos & Final ENV03 Workshop,
7-16 July 2014
International Pyrheliometer Comparison (IPC) 2010