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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.
Replication
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
Maiana4
. 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