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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2019-479
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-479
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 06 Jan 2020

Submitted as: research article | 06 Jan 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

A hybrid method for reconstructing the historical evolution of aerosol optical depth from sunshine duration measurements

William Wandji Nyamsi1, Antti Lipponen1, Arturo Sanchez–Lorenzo2, Martin Wild3, and Antti Arola1 William Wandji Nyamsi et al.
  • 1Finnish Meteorological Institute, Kuopio, Finland
  • 2Department of Physics, Universityof Extremadura, Badajoz, Spain
  • 3ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland

Abstract. A novel method has been developed to estimate aerosol optical depth (AOD) from sunshine duration (SD) measurements under cloud-free conditions. It is a physically-based method serving for the reconstruction of the historical evolution of AOD during the last century. In addition to sunshine duration data, it requires daily water vapor and ozone products as inputs taken from the ECMWF twentieth century reanalysis ERA-20C, available at global scale over the period 1900–2010. Surface synoptic cloud observations are used to identify cloud-free days. For sixteen sites over Europe, the accuracy of the estimated daily AOD, and its seasonal variability, is similar or better than those from two earlier methods when compared to AErosol RObotic NETwork measurements. In addition, it also improves the detection of the signal from massive aerosol events such as important volcanic eruptions (e.g., Arenal and Fernandina Island in 1968, Chichón in 1982 and Pinatubo in 1992). Finally, the reconstructed AOD time series are in good agreement with the dimming/brightening phenomenon and also provides preliminary evidence of the early-brightening phenomenon.

William Wandji Nyamsi et al.

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William Wandji Nyamsi et al.

William Wandji Nyamsi et al.

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Latest update: 28 May 2020
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Short summary
This paper proposes a novel and accurate method for estimating aerosol optical depth from sunshine duration measurements under cloud-free conditions at any place and time. The method performs very well when compared to AErosol RObotic NETwork measurements with detection of signals from massive volcanic eruptions. Reconstructed long-term aerosol optical depths are in agreement with the dimming/brightening phenomenon. We believe that our research will be widely used in the near future.
This paper proposes a novel and accurate method for estimating aerosol optical depth from...
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