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letters to nature NATURE |VOL 407 |26 OCTOBER 2000 |www.nature.com 993

Summary: letters to nature
NATURE |VOL 407 |26 OCTOBER 2000 |www.nature.com 993
washington.edu/datasets/eqpacislandrainindex/); this procedure allows us to align major
peaks and troughs that occur within the same calendar year with adjustments that are
generally less than 3 months. Because corals grow at variable rates throughout the year29
these small chronological adjustments are reasonable and customary (and do not affect
estimates of multiyear variability). Near the base of the core, an age adjustment of 1 year
was needed, suggesting an age uncertainty on the full record of 61 year. The Maiana coral
grew at a rate of 7±12 mm per year; we interpolated records to a common time step of
bimonthly resolution for further analysis.
The record from core MAI95-2-3 is well replicated by additional records of 65±70 years
from Maiana and Aranuka, about 75 km southeast of Maiana (J.E.C. et al., manuscript in
preparation) and by a published 97-year record from Tarawa Atoll, about 30 km north of
. Correlation coef®cients among coral and instrumental data over the common
period 1950±89 are consistently high (Table 1), adding con®dence to single-core
reconstruction of regional variability in western Kiribati. We focus on the MAI95-2-3
record for further analysis because it extends the record of ENSO into pre-instrumental


Source: Amelung, Falk - Rosenstiel School of Marine and Atmospheric Sciences, University of Miami
Segall, Paul - Department of Geophysics, Stanford University


Collections: Geosciences