1808 mystery volcano eruption with global climatic impact

Background. The 1808 mystery eruption is characterized by a significant rise in stratospheric sulfur aerosols, leading to global cooling. A 1991 study of Antarctic and Greenland ice cores identified a sulfate spike in early 1809, approximately half the magnitude of the 1815 Tambora eruption. Further research using bristlecone pine tree ring data indicated the eruption occurred in 1808 rather than 1809, suggesting a complex pattern of multiple eruptions.

Historical Observations. Francisco José de Caldas, Director of the Astronomical Observatory of Bogotá, reported a "transparent cloud" obstructing the sun's brilliance in 1809. This phenomenon was first observed on 11 December 1808 and was visible across Colombia. These reports led researchers to suggest the eruption window was within seven days of 4 December 1808, providing a temporal anchor for the event.

Candidate Locations. The south-western Pacific Ocean between Indonesia and Tonga is considered a likely area for the eruption, as it contains candidate volcanoes and had limited reporting at the time. Other potential sources include major eruptions in the Azores and the Philippines in 1808, though the Chilean Putana volcano is considered slightly outside the preferred latitude range.