Sensitivity of aerosol optical depth trends using long-term measurements of different sun photometers ...

• Main Authors: Karanikolas, Angelos, Kouremeti, Natalia, Gröbner, Julian, Egli, Luca, Kazadzis, Stelios
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2022
• Subjects: Aerosol Robotic Network
• Online Access: https://dx.doi.org/10.3929/ethz-b-000576926; http://hdl.handle.net/20.500.11850/576926

This work aims to assess differences in the aerosol optical depth (AOD) trend estimations when using high-quality AOD measurements from two different instruments with different technical characteristics and operational (e.g. measurement frequency), calibration and processing protocols. The different types of sun photometers are the CIMEL that is part of AERONET (AErosol RObotic NETwork) and a precision filter radiometer (PFR) that is part of the Global Atmosphere Watch Precision Filter Radiometer network. The analysis operated for two wavelengths (500 and 501 and 870 and 862 nm for CIMEL–PFR) in Davos, Switzerland, for the period 2007–2019. For the synchronous AOD measurements, more than 95 % of the CIMEL–PFR AOD differences are within the WMO-accepted limits, showing very good measurement agreement and homogeneity in calibration and post-correction procedures. AOD trends per decade in AOD for Davos for the 13-year period of analysis were approximately −0.017 and −0.007 per decade for 501 and 862 nm (PFR), ... : Atmospheric Measurement Techniques, 15 (19) ...