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A 106 year monthly coral record reveals that the East Asian summer monsoon modulates winter PDO variability
Author(s) -
Watanabe Tsuyoshi,
Kawamura Takashi,
Yamazaki Atsuko,
Murayama Masafumi,
Yamano Hiroya
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl060037
Subject(s) - teleconnection , pacific decadal oscillation , climatology , sea surface temperature , coral , environmental science , east asian monsoon , oceanography , porites , monsoon , el niño southern oscillation , geology
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 δ 18 O 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 δ 18 O 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 δ 18 O suggested that recent and future global warming may lead to a more frequent and/or stronger teleconnection between EASM and PDO.