Interannual and decadal variability of the western Pacific sea surface condition for the years 1787–2000: Reconstruction based on stable isotope record from a Guam coral

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  • Ryuji Asami
    Institute of Geology and Paleontology, Graduate School of Science Tohoku University Sendai Japan
  • Tsutomu Yamada
    Institute of Geology and Paleontology, Graduate School of Science Tohoku University Sendai Japan
  • Yasufumi Iryu
    Institute of Geology and Paleontology, Graduate School of Science Tohoku University Sendai Japan
  • Terrence M. Quinn
    College of Marine Science University of South Florida St. Petersburg Florida USA
  • Christopher P. Meyer
    Florida Museum of Natural History University of Florida Gainesville Florida USA
  • Gustav Paulay
    Florida Museum of Natural History University of Florida Gainesville Florida USA

書誌事項

公開日
2005-05
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2004jc002555
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We present a monthly resolved, 213‐year stable isotope time series from a coral from Guam (13°N, 145°E), which is located on the northern edge of the western Pacific warm pool. Oxygen isotopic composition of the coral skeleton (δ<jats:sup>18</jats:sup>O<jats:sub>coral</jats:sub>) shows seasonal, interannual, and decadal variability, which documents significant oceanographic changes related to thermal and hydrologic variations in this region. The δ<jats:sup>18</jats:sup>O<jats:sub>coral</jats:sub> anomaly reflects sea surface temperature (SST) anomaly and sea surface salinity (SSS) anomaly with significant <jats:italic>r</jats:italic> values of −0.69 and 0.49, respectively, which are strongly linked to oceanographic changes that occur during El Niño–Southern Oscillation (ENSO) warm and cool phases. We identified 46 ENSO warm (El Niño) and 53 cool phases (La Niña) in the coral record, which are consistent with those phases reconstructed by Niño 3.4 SST anomaly. Spectral analyses of the δ<jats:sup>18</jats:sup>O<jats:sub>coral</jats:sub> anomaly record for the years 1790–1999 identified significant peaks around ∼3 to ∼7 years. These results indicate that the Guam coral has recorded ENSO periodicity. The δ<jats:sup>18</jats:sup>O<jats:sub>coral</jats:sub> anomaly shows decadal variability of ∼15‐ to ∼45‐year periodicity with significant shifts (<0.2‰) from warmer to cooler condition and vice versa. An accumulative decrease in δ<jats:sup>18</jats:sup>O<jats:sub>coral</jats:sub> time series may imply ∼0.75°C warming of SST and ∼0.23‰ freshening of seawater δ<jats:sup>18</jats:sup>O, corresponding to a decrease of SSS by ∼0.85, in the northwestern tropical Pacific over the last 2 centuries.</jats:p>

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