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GAW-PFR Network and its Calibration Christoph Wehrli and Stephan Nyeki

GAW-PFR Network and its Calibration Christoph Wehrli and Stephan Nyeki. Physikalisch-Meteorologisches Observatorium Davos, Switzerland. Network extent and growth Upgrade for NRT operation and rapid delivery Maintenance of reference TRIAD and network calibration. Ny Ålesund. Mace Head.

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GAW-PFR Network and its Calibration Christoph Wehrli and Stephan Nyeki

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  1. GAW-PFR Network and its CalibrationChristoph Wehrli and Stephan Nyeki Physikalisch-Meteorologisches Observatorium Davos, Switzerland • Network extent and growth • Upgrade for NRT operation and rapid delivery • Maintenance of reference TRIAD and network calibration

  2. Ny Ålesund Mace Head Bratts Lake Hohenpeissenberg Jungfraujoch Ryori Izaña Waliguan Mauna Loa Danum Valley Alice Springs Cape Point GAW-PFR Network & Customer sites ● (Summit) Sweden 3 Finland 2 ● ● Valentia Germany +3 Cabauw Japan +3 Switzerland +3 12 GAW & 19 NMHI stations Antarctica 3

  3. Visby Zingst Lindenberg Zugspitze Kiruna Sodankyla Jokioinen Norrkoeping Cabauw Valentia GAW-PFR Network Associate Stations ScandinaviaJokioinen, FI, FMI Kiruna, SE, SMHINorrköping, SE, SMHISodankylä, FI, FMIVisby, SE, SMHICentral EuropeValentia, IE, MetEireCabauw, NL, KNMLZingst, DE, DWDLindenberg, DE, DWDZugspitze, DE, DWD AntarcticaMarambio, AQ, FMITroll, AQ, NILU

  4. GAW-PFR Network collected data

  5. NRT or Rapid Delivery of AOD • GAW Strategic plan 2008 - 2015 calls for NRT delivery of some data (like O3, AOD) for assimilation in and validation of Numerical Weather Prediction, Air Quality Monitoring, and chemical weather forecast models • WIGOS/WIS Pilot Project GAW 2008 – 2010 • GAW-WDCA @NILU ready to accept NRT data 2010/01 • ET-NRT-CDT kick-off Meeting 2010/03

  6. Data and Product Users WIS – GAW Architecture World Data Centres(also known as WIS DCPC's) GlobalAtmosphere Watch (GAW) Observing systems contributing to GAW National Centers(includes WIS NC's) GAWSIS Web site GAW Web site WMO InformationSystem(WIS) WIS Global Information System Centres (GISC's) Courtesy Eliot Christian, WMO presentation for ET-NRT WS2010

  7. KEY: NC = National Centres GISC = Global Information System Centres DCPC = Data Collection or Production Centres Data exchange through GTS/WIS

  8. Acts like a GISC, but outside WIGOS hourly (TCP/IP) PFR Logger QA annually WORCC monthly (email) daily (FTP) daily (FTP) Acts like a DCPC, but outside WIGOS GAW Station WDCA GAW-PFR network data flow

  9. Calibration Hierarchy • CIMO recommendation for AOD to be traceable to WORCC • Comparison Campaign à la FRC-III • On site comparison at co-locations

  10. Network Calibration Hierarchy • Langley calibration for Master PFR at high altitude sites MLO, IZO, JFJ • Triad of reference PFR maintained at Davos • Side by side comparison of field PFR every 1 – 3 years, instrument swap • In-situ calibration by Langley method at suitable stations • Travelling standard PFR comparison SIMBA98 stratospheric balloon experiment

  11. A B C Maintenance of Reference TRIAD 1% Goal: cross calibration between each 2 references ≤1% ! (0.5%) Relative measure of stability – generic ageing still possible

  12. Calibration History Langley statistics over 12 months (N≈125), confirmed by Langley at MLO. CV< ≈ 1%, annual drift <0.5% Annual re-calibration during polar night U95< 1%, annual drift <0.5%

  13. Traceability (intercomparisons) • FRC-II intercomparison Davos, 14 instruments • AERONET – GAW comparison at 3 co-location PolarAOD campaign @Ny Ålesund • EUSAAR intercomparison, 6 instruments, September • EUSAAR site audits at 3 stations PolarAOD @Izaña, October • EUSAAR site audits at 2 stations • FRC-III intercomparison Davos

  14. Second Filter Radiometer Comparison FRC-II 26th September – 14th October, 2005 at Davos Participating Institutions (9) and Instruments (15) • WORCC (CH) PFR N01, N26, N27, CIMEL#354 • DWD (Germany) PFR N33 • SMHI (Sweden) PFR N35 • MSC (Canada) PFR N23, CIMEL#24 • BOM (Australia) SPO2#1020, #1031, PFR N19 • MS (UK) SPO2#1017 • NOAA (USA) SPO2#1022 • IES/Ispra (EU) ASR 1003 • U. Colima (Mexico) PFR N20 ( for repair & calibration)

  15. FRC-II 2005 GAW Criterion: 95% of >1000 samples on >5 days within ΔAOD ≤ 0.005 + 0.01/m

  16. Co-location Davos 2008 L1.5 L2.0 N = 3898; agreement in cloud-screening: 92%

  17. EUSAAR Audits 2008 Cabauw Ispra N = 500 / 950; MBD <0.001, Prct 85%

  18. PFR network web access • Daily summary plots • Numerical values with metadata are available by email upon request. • Hourly means in NARSTO format are available from WDCA, updated annually. Quick-look plots Annual mean plot http://www.pmodwrc.ch/worcc

  19. GAW AOD Network metadata • GAWSIS lists multi-wavelength AOD at 49 stations including some metadata • WDCA archive has metadata in NARSTO format • PFR Network maintains metadata at WORCC and WDCA

  20. World Data Center Aerosols

  21. Mt. Waliguan, China AOD at Mt. Waliguan is significantly higher than at comparable altitudes

  22. Thank you for your attention Sunrise at Mt. Waliguan, courtesy J. Sun, CAMS

  23. Daily quick-look AOD plots Incoming raw data QC AOD results

  24. Annual hourly and monthly means

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