Cold decade (AD 1810–1819) caused by Tambora (1815) and another (1809) stratospheric volcanic eruption
Article first published online: 21 NOV 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 22, November 2009
How to Cite
2009), Cold decade (AD 1810–1819) caused by Tambora (1815) and another (1809) stratospheric volcanic eruption, Geophys. Res. Lett., 36, L22703, doi:10.1029/2009GL040882., , , , , and (
- Issue published online: 21 NOV 2009
- Article first published online: 21 NOV 2009
- Manuscript Accepted: 16 OCT 2009
- Manuscript Revised: 9 OCT 2009
- Manuscript Received: 14 SEP 2009
- volcanic eruption;
- climatic impact;
- 1809 eruption
 Climate records indicate that the decade of AD 1810–1819 including “the year without a summer” (1816) is probably the coldest during the past 500 years or longer, and the cause of the climatic extreme has been attributed primarily to the 1815 cataclysmic Tambora eruption in Indonesia. But the cold temperatures in the early part of the decade and the timing of the Tambora eruption call into question the real climatic impact of volcanic eruptions. Here we present new evidence, based on sulfur isotope anomaly (Δ33S), a unique indicator of volcanic sulfuric acid produced in the stratosphere and preserved in polar snow, and on the precise timing of the volcanic deposition in both polar regions, that another large eruption in 1809 of a volcano is also stratospheric and occurred in the tropics. The Tambora eruption and the undocumented 1809 eruption are together responsible for the unusually cold decade.