1. Hilal Özen 1 , Nigel Fox 2 , Uğur Murat Leloğlu 1 , Irina Behnert 2 , Andrew Deadman 2 1 TUBITAK UZAY, METU Campus, 06531 Ankara, Turkey (hilal.ozen, leloglu)@uzay.tubitak.gov.tr 2 NPL, TW11 0LW Teddington Middlesex, UK (nigel.fox, irina.behnert, andrew.deadman)@npl.co.uk THE 2010 TUZ GÖLÜ FIELD CAMPAIGN—AN OVERVIEW

6. Tuz Gölü Calibration Test Site Location: 38 50’N, 33 20’E Central Anatolia, Turkey Elevation: 90 7 m Total area: 1964 km² Surface type: Salt lake

13. Pre-Campaign at Tuz Gölü Measurement Site Setup – TUBITAK UZAY

15. Logistics at Ankara Optical Laboratory at Physics Department, METU

16. Laboratory Study at Ankara 45°/0° Lamp-panel and detector-panel geometry - 45º illumination angle is the sun zenith angle for approximately 07:00 UTC at Tuz Gölü in Aug 2010 . 1 kW FEL lamp Reflectance panel ASD radiometer with a 5º FOV Reflectance panel cross- comparison NPL calibrated PTFE reference panel (spectralon like) manufactured by Gigahertz Optik (Optical Diffuser Material)

17. Laboratory Study at Ankara Reference panel characterisations Panel calibrations will be used to normalize participants site reflectance values. Participants reflectance panels were compared to the NPL panel under stable illumination conditions.

18. Laboratory Study at Ankara Transfer Standard Absolute Radiance Source (TSARS) Radiometer cross- comparison against TSAR - NPL TSARS ASD radiometer

20. Logistics at Ankara and Tuz Gölü

21. Logistics at Tuz Gölü UKDMC-2 image ( 08:03:00 UTC , 17/08/10 ) Location of site 3.5 km from entrance

22. Logistics at Tuz Gölü Transportation of the equipments to the measurement site by an a ll-terrain vehicle with trailer Transportation to the hotels by air conditioned minibuses Transportation

23. Logistics at Tuz Gölü Camping Area

24. Logistics at Tuz Gölü Measurement Site N

26. Spectral Measurements at Tuz Gölü 8 different teams multiple different measurement strategies

27. Spectral Measurements at Tuz Gölü 1 7 - 25 August 2010 Site M easurements 1km x 1km site

28. Spectral Measurements at Tuz Gölü All teams measur ed the Thome strip – 3 m x 50 m for a rapid short-term comparison study

29. Spectral Measurements at Tuz Gölü Comparison study – M easuring NPL’s reference panel with own radiometers

30. Spectral Measurements at Tuz Gölü Comparison study - M easuring own reference panel with own radiometers

31. BRDF Measurements at Tuz Gölü NPL performed a BRDF characterization of the site near the measurement sites using the Gonio RAdiometric Spectrometer System (GRASS) instrument. GRASS has been designed to measure the Earth’s reflected sunlight over half a hemisphere, at 30° degree intervals . GRASS – NPL

32. BRDF Measurements at Tuz Gölü Is the BRDF same under fixed illumination conditions ? NPL measured the BRDF of the site under fixed illumination angle of 45 degrees using a calibrated light source provided by ONERA at night time . GRASS – NPL

33. Atmospheric Measurements at Tuz Gölü http://aeronet.gsfc.nasa.gov/new_web/photo_db/Tuz_Golu.html Sunphotometer – TUBITAK UZAY CIMEL CE318 AERONET Direct Sun Products Data Format Aerosol Optical Depth (AOD) with Precipitable Water and Angstrom Parameter Level 1.0 Level 1.5 Level 2.0 Total Optical Depth Level 1.0 Level 1.5 Level 2.0

34. Atmospheric Measurements at Tuz Gölü Yankee Environmental Systems Multifilter Rotating Radiometer (YES MFR) - SDSU Through the process of shadowing the detector with the band, the instrument is capable of measuring total, and diffuse irradiance at six different wavelengths, and calculating direct irradiance. This provides optical depth measurements for water vapor, aerosols, and ozone.