Auxiliary material for paper #2013GL056543
Impact of known local and tropical volcanic eruptions
of the past millennium on the WAIS Divide microparticle record
Bess G. Koffman, Karl J. Kreutz, Andrei V. Kurbatov
(School of Earth and Climate Sciences, University of Maine, Orono, Maine, USA)
Nelia W. Dunbar
(Earth and Environmental Science Department, New Mexico Institute of Mining and
Technology, Socorro, New Mexico, USA)
Corresponding author: B.G. Koffman, School of Earth and Climate Sciences, 5790
BGSC, Orono, Maine 04469, USA. (bess.koffman@maine.edu)
Geophysical Research Letters
Introduction
We include a brief text section and three supplementary figures. The figures include a
map and two data plots.
1. Text01.docx describes how we compared the particle size distributions of individual
dust peaks to the distributions of particle peaks that we infer to be of volcanic origin.
2. Fs01.pdf: Locations of Tambora, Indonesia (Tb); Kuwae, Vanuatu (Kw); Buckle
Island, Antarctica (BI) volcanoes; and West Antarctic Ice Sheet (WAIS) Divide ice core
(WD). Note that Tambora and Kuwae are located in the tropics, while Buckle Island is a
high-latitude volcano.
3. Fs02.pdf corresponds to Figure 1 in the main text. Electrolytic conductivity and
microparticle concentration time series data for the eruptions of: A) Buckle Island (1839),
B) Tambora (1815), C) Kuwae (1458), and D) Unknown (1258). Colored bars indicate
the time intervals used in calculating the PSDs shown in Fig. S3. Abscissa scales have
been adjusted to show variability in the background dust concentration.
4. Fs03.pdf corresponds to Figure 2 in the main text. Particle size distribution data shown
as volume concentration, dV/dlnD, for individual dust peaks occurring around the
eruptions of: A) Buckle Island (1839), B) Tambora (1815), C) Kuwae (1458), and D)
Unknown (1258). Each colored curve corresponds to an interval shown in Fig. S2 by a
colored bar, and the black curve shows the mean background PSD for the four intervals
shown in Fig. S2 (yellow-orange bars). Because the PSD curves for individual dust
peaks are calculated from relatively few particles (low dust concentration), they appear
“spiky.”