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Reconstruction of long-term aerosol optical depth series with sunshine duration records

We report the suitability of sunshine duration (SD) records as a proxy for the reconstruction of atmospheric aerosol content, for which little information exists, especially prior to the 1980s. Specifically, we have treated cloudless summer days in 16 stations throughout Spain. For almost all sites we find statistically significant relationships between aerosol optical depth (AOD), and daily SD. The correlation coefficient presents a mean value of −0.72, and slope values of the linear regressions are within the range [−0.11, −0.36]. The relationships are used to generate AOD series back to the 1960s (to the 1920s for Madrid). These reconstructed series show an increase in AOD from the mid-1960s to the 1980s, followed by a decrease until the present, in agreement with changes in anthropogenic aerosol emissions and with opposite trends of solar irradiance. The method can be used to reconstruct AOD from the late 19th century at many stations worldwide

This research was supported by the Spanish Ministry of Economy and Competitiveness - projects NUCLIERSOL (CGL2010-18546) and NUBESOL (CGL2014-55976-R). The first author enjoys a grant by the FPU program (FPU AP2010-0917) of the Spanish Ministry of Education. The second author enjoys a grant from the Spanish Ministry of Economy and Competitiveness (JCI-2012-12508)

© Geophysical Research Letters, 2016, vol. 43, p. 1296-1305

American Geophysical Union (AGU)

Author: Sánchez Romero, Alejandro
Sánchez Lorenzo, Arturo
González Gutiérrez, Josep Abel
Calbó Angrill, Josep
Date: 2016 February 13
Abstract: We report the suitability of sunshine duration (SD) records as a proxy for the reconstruction of atmospheric aerosol content, for which little information exists, especially prior to the 1980s. Specifically, we have treated cloudless summer days in 16 stations throughout Spain. For almost all sites we find statistically significant relationships between aerosol optical depth (AOD), and daily SD. The correlation coefficient presents a mean value of −0.72, and slope values of the linear regressions are within the range [−0.11, −0.36]. The relationships are used to generate AOD series back to the 1960s (to the 1920s for Madrid). These reconstructed series show an increase in AOD from the mid-1960s to the 1980s, followed by a decrease until the present, in agreement with changes in anthropogenic aerosol emissions and with opposite trends of solar irradiance. The method can be used to reconstruct AOD from the late 19th century at many stations worldwide
This research was supported by the Spanish Ministry of Economy and Competitiveness - projects NUCLIERSOL (CGL2010-18546) and NUBESOL (CGL2014-55976-R). The first author enjoys a grant by the FPU program (FPU AP2010-0917) of the Spanish Ministry of Education. The second author enjoys a grant from the Spanish Ministry of Economy and Competitiveness (JCI-2012-12508)
Format: application/pdf
ISSN: 0094-8276 (versió paper)
1944-8007 (versió electrònica)
Document access: http://hdl.handle.net/10256/12236
Language: eng
Publisher: American Geophysical Union (AGU)
Collection: MINECO/PE 2015-2017/CGL2014-55976-R
MICINN/PN 2011-2014/CGL2010-18546
Versió postprint del document publicat a: http://dx.doi.org/10.1002/2015GL067543
Articles publicats (D-F)
Is part of: © Geophysical Research Letters, 2016, vol. 43, p. 1296-1305
Rights: Tots els drets reservats
Subject: Radiació solar
Aerosols
Solar radiation
Title: Reconstruction of long-term aerosol optical depth series with sunshine duration records
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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