Articles | Volume 15, issue 19
Research article
11 Oct 2022
Research article |  | 11 Oct 2022

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

Angelos Karanikolas, Natalia Kouremeti, Julian Gröbner, Luca Egli, and Stelios Kazadzis

Data sets

Davos Aerosol Optical Depth (AOD) with Precipitable Water and Angstrom Parameter level 2.0 Version 3 Direct Sun Algorithm C. Wehrli, N. Kouremeti, and International AERONET Federation

Model code and software

DLM Matlab Toolbox M. Laine

Short summary
The aim of this work is to investigate the limitations of calculating long-term trends of a parameter that quantifies the overall effect of atmospheric aerosols on the solar radiation. A main finding is that even instruments with good agreement between their observations can show significantly different linear trends. By calculating time-varying trends, the trend agreement is shown to improve. We also show that different methods of trend estimation can result in significant trend differences.