Aerosol perturbations related to volcanic eruptions during the past few centuries as recorded in an ice core from the Central Dronning Maud Land, Antarctica

• Main Authors: Thamban, M, Chaturvedi, A, Rajakumar, A, Naik, SS, D'Souza, W, Singh, A, Rajan, S, Ravindra, R
• Format: Article in Journal/Newspaper
• Language: English
• Published: Indian Academy of Sciences 2006
• Subjects: Earth Resources and Remote Sensing; oceanography; Dronning Maud Land; East Antarctica; Greenland; Antarc*; Antarctica; ice core
• Online Access: http://moeseprints.incois.gov.in/558/; http://moeseprints.incois.gov.in/558/1/6a85e52dce80351020.pdf

High-resolution glacio-chemical analyses were carried out in a 62.2 m long ice core recovered from the Central Dronning Maud Land, East Antarctica, to evaluate temporal changes in environmental characteristics during the past five centuries. The sulphate (SO 4 2-) content within the core varied between 15 and 377 ppb, whereas the sodium (Na +) and chloride (Cl -) content fluctuated widely from 7 to 500 ppb and 25 to 1461 ppb respectively. The computed non-sea-salt sulphate (nssSO 4 2-) record reveals the existence of several outstanding peaks that can be attributed to the sulphate aerosol deposition during large volcanic events as recorded in Antarctica and elsewhere. Major volcanic events identified at the core site include: Mt Pinatubo (1991), Agung (1963), Krakatau/Tarawera (1883/1886), Tambora (1815) and Huaynaputina (1600) among several other moderate events. Comparison of our nssSO 4 2- record with that of ice core records from Greenland reveals analogous sulphate deposition during certain major volcanic events, demonstrating the interhemispheric transport of aerosols during large volcanic eruptions. Relatively high Cl -/Na + ratio throughout the core (mean 3.1) compared to that of the sea water ratio implies additional sources of Cl -, most likely due to the intense scavenging of gaseous Cl - in the lower atmosphere.