Atmos. Chem. Phys. Discuss., 7, 5145–5172, 2007 Atmospheric www.atmos-chem-phys-discuss.net/7/5145/2007/ Chemistry © Author(s) 2007. This work is licensed and Physics under a Creative Commons License. Discussions Atmospheric effects of volcanic eruptions as seen by famous artists and depicted in their paintings C. S. Zerefos1,2, V. T. Gerogiannis3, D. Balis4, S. C. Zerefos5, and A. Kazantzidis4 1National Observatory of Athens, Greece 2Academy of Athens, Greece 3National Meteorological Service, Greece 4Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Greece 5Department of Architecture, National Technical University of Athens, Greece Received: 26 February 2007 – Accepted: 5 April 2007 – Published: 16 April 2007 Correspondence to: C. S. Zerefos (
[email protected]) 5145 Abstract Paintings created by famous artists, representing sunsets throughout the period 1500– 1900, provide proxy information on the aerosol optical depth following major volcanic eruptions. This is supported by a statistically significant correlation coefficient (0.8) be- 5 tween the measured red-to-green ratios of 327 paintings and the corresponding values of the dust veil index. A radiative transfer model was used to compile an independent time series of aerosol optical depth at 550 nm corresponding to Northern Hemisphere middle latitudes during the period 1500–1900. The estimated aerosol optical depths range from 0.05 for background aerosol conditions, to about 0.6 following the Tambora 10 and Krakatau eruptions and cover a time period mostly outside of the instrumentation era. 1 Introduction Man-made forcing of climate change is complicated by the fact that it is superimposed on natural climate variability.