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Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC)

Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC). The PMOD/WRC is the World Radiation Center of the World Meteorological Organisation,. And is signatory of the Mutual Recognition Arrangement by the Committee of Weights and Measures (CIPM MRA). PMOD/WRC.

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Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC)

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  1. Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC) The PMOD/WRC is the World Radiation Center of the World Meteorological Organisation, And is signatory of the Mutual Recognition Arrangement by the Committee of Weights and Measures (CIPM MRA).

  2. PMOD/WRC PMOD/WRC World Radiation Center Absolute radiometry (ARS) Infrared radiometry (IRS) Optical depth WORCC UV radiometry (WCC-UV)

  3. EMRP-ENV03 “Solar UV” http://projects.pmodwrc.ch/env03/ • Enhance the reliability of spectral solar UV radiation measured at the Earth surface • Develop new techniques and devices fortraceabilitybetter than 2% (now 5%) and for cost-effective array-spectroradiometer inUV monitoring networks • Intercomparison Campaigns and Workshops • Project Coordination:Julian Gröbner, Davos • Duration: 2011 - 2014 • Total Budget: 3.9 M€ • 8 Partners EU-NMI; 2Industry;2Universities; > 3Collaborators (Stakeholders) Calibrated UV Network End-User Devices Transfer Standard Reference Spectroradiometer Primary Irradiance Standard

  4. Traceability chain for spectral irradiance Wm-2nm-1 Cryogenicradiometer 0.01% Detector Source cw-Laser Sources Si-trap detector + aperture Spectrally tuneable source Filter Radiometer Blackbody + aperture ~0.3% Spectroradiometer Spectral irradiance standard ~1-3% Portable transfer standard (used for stability check) ~4% Spectroradiometer ~5% Gröbner & Sperfeld, Metrologia, 2006

  5. Validation of the QASUME irradiance reference at PTB Blackbody BB3200pg at PTB QASUME Validation at PTB in 2004 and 2013 ±1.2% 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.

  6. UV Quality Assurance Program Quality site audit with the QASUME reference spectroradiometer Status 2002 - 2013 • 63 site visits • 34 sites • >150 spectroradiometer intercomparisons Ny Ålesund, Spitzbergen, 2009 QASUME RBCC-E, 2005-2013 Gröbner et al., Appl. Opt. 2005 Gröbner et al., Metrologia, 2006 http://www.pmodwrc.ch/euvc/euvc.php?topic=qasume_audit

  7. RBCC-E @ El Arenosillo“The sunny place” 1999, 2005, 2007, 2009, 2011, 2013 2005

  8. Daily ratios to QASUME: The ideal case

  9. Brewer cosine error

  10. Brewer cosine error

  11. Single Brewer Stray light

  12. Brewer Temperature dependency Temp. coefficient -0.3 %/K 6%

  13. Summary from 6th RBCC-E (2011)

  14. Wavelength scale

  15. What needs to be addressed? • Temperaturedependency • Absolute calibration • Wavelengthdispersion • Single Brewer Stray Light • Angular Response • ApplyCorrection, • orbetter: • Entranceopticmodification

  16. Spectral solar UV Intercomparison at Davos & Final ENV03 Workshop, 7-16 July 2014 International Pyrheliometer Comparison (IPC) 2010 • Presentations, Guidelines, Publications can be found at the project web-site: http://projects.pmodwrc.ch/env03/

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