Volcanic eruptions recorded in the Illimani ice core (Bolivia): 1918–1998 and Tambora periods M. De Angelis1, J. Simões1,2, H. Bonnaveira1, J.-D. Taupin3, and R. J. Delmas1 1LGGE, CNRS and Université Joseph Fourier, Grenoble-Saint Martin d’Hères, France 2Institute of Geosciences, Federal University of Rio Grande do Sul, Porto Alegre, Brazil 3LGGE, IRD, Grenoble-Saint Martin d’Hères, France
Abstract. Acid layers of volcanic origin detected in polar snow and ice layers are commonly used to
document past volcanic activity on a global scale or, conversely, to date polar ice cores.
Although most cataclysmic eruptions of the last two centuries (Pinatubo, El
Chichon, Agung, Krakatoa, Cosiguina, Tambora, etc.) occurred in the tropics, cold tropical glaciers have not
been used for the reconstruction of past volcanism. The glaciochemical study of a
137 m ice core drilled in 1999 close to the summit of Nevado Illimani (Eastern Bolivian Andes,
16°37' S, 67°46' W, 6350 m asl) demonstrates, for the first time, that such eruptions are
recorded by both their tropospheric and stratospheric deposits. An 80-year ice sequence
(1918-1998) and the Tambora years have been analyzed in detail. In several cases, ash,
chloride and fluoride were also detected. The ice records of the Pinatubo (1991), Agung
(1963) and Tambora (1815) eruptions are discussed in detail. The potential impact of less
important regional eruptions is discussed.
Citation: De Angelis, M., Simões, J., Bonnaveira, H., Taupin, J.-D., and Delmas, R. J.: Volcanic eruptions recorded in the Illimani ice core (Bolivia): 1918–1998 and Tambora periods, Atmos. Chem. Phys., 3, 1725-1741, doi:10.5194/acp-3-1725-2003, 2003.