A 106 year monthly coral record reveals that the East Asian summer monsoon modulates winter PDO variability

Tsuyoshi Watanabe, Takashi Kawamura, Atsuko Yamazaki, Masafumi Murayama, Hiroya Yamano

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The Pacific Decadal Oscillation (PDO) is a dominant climate mode in the Pacific Ocean and thought to be related to seasonal to decadal changes in sea surface conditions. Colonies of long-living Porites coral, widely used to reconstruct monthly to century-scale tropical sea surface temperature and sea surface salinity records, were discovered near Koshiki Island, Japan (31°N, 129°E). A monthly resolved, 106 year δ18O record revealed that distinct decadal-scale variability was significantly correlated with the PDO index. Our comparison showed 1 to 3 years lead-lag correlation of summer coral δ18O with the winter PDO index, suggesting that the East Asian summer monsoon (EASM) may act as the driving force of winter PDO variability over the last 100 years. Cross-spectral analysis between the winter PDO index and summer coral δ18O suggested that recent and future global warming may lead to a more frequent and/or stronger teleconnection between EASM and PDO.

Original languageEnglish
Pages (from-to)3609-3614
Number of pages6
JournalGeophysical Research Letters
Volume41
Issue number10
DOIs
Publication statusPublished - May 28 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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