WORCC-PMOD/WRC quality assured aerosol optical depth and Ångström exponent for Troll/Trolhaugen GAW-PFR station (2007- 2023)

WORCC-PMOD/WRC quality assured aerosol optical depth and Ångström exponent for Trollhaugen GAW-PFR station (2007- 2023)

Aerosol optical depth (AOD) measurements have been performed within the frame of Global Atmospheric Watch Precision Filter Radiometer (GAW-PFR) network in Trollhaugen (TRO) (72.01o S, 2.54o E, 1553 m) since 2007. The measurements are performed from October-April, with two PFR (PrecisionFilterRadiometer) instruments owned by NILU(Norsk institutt for luftforskning). The solar tracker and infrastructure are provided by NILU in collaboration with the Norwegian Polar Institute.

PFR manufactured by PMOD/WRC is a temperature stabilized instrument at 20o C equipped with four narrow band interference filters with nominal centroid wavelengths 368 nm, 412 nm, 500 nm and 862 nm and bandpass (fullwidth half maximum) 4 nm for 368 nm channel and 5 nm for the rest. The instruments are calibrated in yearly bases against the WMO-AOD reference (GAWPFR-TRIAD) at PMOD/WRC during the polar winter. The operation is done remotely by NILU and PMOD/WRC with the installation and onsite maintenance (cleaning, alignment adjustments) done by personnel of NILU and the Norwegian Polar Institute.

The processing and quality assurance of the data is done following the protocols of World Optical depth Research and Calibration Center (WORCC, PMOD/WRC) (Kazadzis, et al., 2018) and are submitted to the WDCA database (EBAS-NILU) as hourly mean AOD and AE values. This dataset contains high-resolution data (1 min) and daily mean values of cloud screened and quality assured since 2007. The provided Ångström exponent is retrieved from the 4 wavelengths.

version: v1 (20-Jan-2007 - 19-Dec-2023)

Contributions:

KN: Calibration, operation, and processing since 2014, WORCC quality assurance protocols, quality assurance of the presented dataset

WC: calibration, operation, and processing 2007-2014

LC: site researcher, operation and maitenance 

BA: site engineer, operation and maitenance 

KS: consulting on WORCC PMOD/WRC quality assurance protocols

SK: principal investigator of hosting institute NILU

Acknowledgement: 

Special thanks to the personnel of the Engineers Sverdrupstasjonen Trollhaugen for all the valuable technical support.