BSRN XI meeting 2010/04 GAW-PFR Network and its Calibration Christoph Wehrli and Stephan Nyeki Physikalisch-Meteorologisches Observatorium Davos, Switzerland 1.Network extent and growth 2.Upgrade for NRT operation and rapid delivery 3.Maintenance of reference TRIAD and network calibration

BSRN XI meeting 2010/04 GAW-PFR Network & Customer sites ● ● Cabauw (Summit) Sweden 3 Finland 2 Japan +3 Antarctica 3 Germany GAW & 19 NMHI stations Valentia ● Switzerland +3

BSRN XI meeting 2010/04 GAW-PFR Network Associate Stations Scandinavia Jokioinen, FI, FMI Kiruna, SE, SMHI Norrköping, SE, SMHI Sodankylä, FI, FMI Visby, SE, SMHI Central Europe Valentia, IE, MetEire Cabauw, NL, KNML Zingst, DE, DWD Lindenberg, DE, DWD Zugspitze, DE, DWD Antarctica Marambio, AQ, FMI Troll, AQ, NILU Sodankyla Jokioinen Visby Valentia Cabauw Norrkoeping Kiruna Zingst Lindenberg Zugspitze

BSRN XI meeting 2010/04 GAW-PFR Network collected data

BSRN XI meeting 2010/04 NRT or Rapid Delivery of AOD GAW Strategic plan 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 ready to accept NRT data 2010/01 ET-NRT-CDT kick-off Meeting 2010/03

BSRN XI meeting 2010/04 WIS – GAW Architecture National Centers (includes WIS NC's) GAWSIS Web site Observing systems contributing to GAW Data and Product Users WIS Global Information System Centres (GISC's) Global Atmosphere Watch (GAW) WMO Information System (WIS) GAW Web site World Data Centres (also known as WIS DCPC's) Courtesy Eliot Christian, WMO presentation for ET-NRT WS2010

BSRN XI meeting 2010/04 Data exchange through GTS/WIS KEY: NC = National Centres GISC = Global Information System Centres DCPC = Data Collection or Production Centres

BSRN XI meeting 2010/04 GAW-PFR network data flow PFR Logger WORCC GAW StationWDCA hourly (TCP/IP) daily (FTP) monthly ( ) QA annually Acts like a DCPC, but outside WIGOS Acts like a GISC, but outside WIGOS daily (FTP)

BSRN XI meeting 2010/04 Calibration Hierarchy CIMO recommendation for AOD to be traceable to WORCC Comparison Campaign à la FRC-III On site comparison at co-locations

BSRN XI meeting 2010/04 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

BSRN XI meeting 2010/04 Maintenance of Reference TRIAD Goal: cross calibration between each 2 references ≤1% ! (0.5%) Relative measure of stability – generic ageing still possible 2008RGBV A / C B / C A / B CB A 1%

BSRN XI meeting 2010/04 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%

BSRN XI meeting 2010/04 Traceability (intercomparisons) 2005) FRC-II intercomparison Davos, 14 instruments 2006) AERONET – GAW comparison at 3 co-location PolarAOD Ålesund 2007) EUSAAR intercomparison, 6 instruments, September 2008) EUSAAR site audits at 3 stations October 2009) EUSAAR site audits at 2 stations 2010) FRC-III intercomparison Davos

BSRN XI meeting 2010/04 Second Filter Radiometer Comparison FRC-II 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) 26 th September – 14 th October, 2005 at Davos

BSRN XI meeting 2010/04 FRC-II 2005 GAW Criterion: 95% of >1000 samples on >5 days within ΔAOD ≤ /m

BSRN XI meeting 2010/04 Co-location Davos 2008 L MBD RMS Prcnt7396 L MBD RMS Prcnt9198 N = 3898; agreement in cloud-screening: 92% L1.5 L2.0

BSRN XI meeting 2010/04 EUSAAR Audits 2008 CabauwIspra N = 500 / 950; MBD <0.001, Prct 85%

BSRN XI meeting 2010/04 PFR network web access Daily summary plots Numerical values with metadata are available by upon request. Hourly means in NARSTO format are available from WDCA, updated annually. Annual mean plot Quick-look plots

BSRN XI meeting 2010/04 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

BSRN XI meeting 2010/04 World Data Center Aerosols

BSRN XI meeting 2010/04 Mt. Waliguan, China AOD at Mt. Waliguan is significantly higher than at comparable altitudes

BSRN XI meeting 2010/04 Sunrise at Mt. Waliguan, courtesy J. Sun, CAMS

BSRN XI meeting 2010/04 Daily quick-look AOD plots Incoming raw dataQC AOD results

BSRN XI meeting 2010/04 Annual hourly and monthly means