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| Titel |
Persistent decadal-scale rainfall variability in the tropical South Pacific Convergence Zone through the past six centuries |
| VerfasserIn |
C. R. Maupin, J. W. Partin, C.-C. Shen, T. M. Quinn, K. Lin, F. W. Taylor, J. L. Banner, K. Thirumalai, D. J. Sinclair |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 4 ; Nr. 10, no. 4 (2014-07-10), S.1319-1332 |
| Datensatznummer |
250117014
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| Publikation (Nr.) |
 copernicus.org/cp-10-1319-2014.pdf |
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| Zusammenfassung |
| Modern Pacific decadal variability (PDV) has global impacts; hence records
of PDV from the pre-instrumental period are needed to better inform models
that are used to project future climate variability. We focus here on
reconstructing rainfall in the western tropical Pacific (Solomon Islands;
~ 9.5° S, ~160° E), a
region directly influenced by PDV, using cave deposits (stalagmite). A
relationship is developed between δ18O variations in the
stalagmite and local rainfall amount to produce a 600 yr record of rainfall
variability from the South Pacific Convergence Zone (SPCZ). We present
evidence for large (~1.5 m), abrupt, and periodic changes in
total annual rainfall amount on decadal to multidecadal timescales since
1423 ± 5 CE (Common Era) in the Solomon Islands. The timing of the
decadal changes in rainfall inferred from the 20th century portion of
the stalagmite δ18O record coincides with previously identified
decadal shifts in PDV-related Pacific ocean–atmosphere behavior
(Clement et al., 2011; Deser et al., 2004). The Solomons record of
PDV is not associated with variations in external forcings, but rather
results from internal climate variability. The 600 yr Solomon Islands
stalagmite δ18O record indicates that decadal oscillations in
rainfall are a persistent characteristic of SPCZ-related climate
variability. |
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