A 106 year monthly coral record reveals that the East Asian summer monsoon modulates winter PDO variability
A 106 year monthly coral record reveals that the East Asian summer monsoon modulates winter PDO variability
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DOI：
10.1002/2014gl060037
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发表时间：
2014-05
影响因子：
5.2
通讯作者：
Tsuyoshi Watanabe;T. Kawamura;A. Yamazaki;M. Murayama;H. Yamano
中科院分区：
文献类型：
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作者：
Tsuyoshi Watanabe;T. Kawamura;A. Yamazaki;M. Murayama;H. Yamano
太平洋年代际振荡（PDO）是太平洋的一种主要气候模态，被认为与海表条件的季节性至年代际变化有关。在日本Koshiki岛附近（31°N，129°E）发现了长寿的滨珊瑚群，广泛用于重建每月至世纪尺度的热带海面温度和海面盐度记录。一个每月分解的106年δ 18 O记录显示，明显的十年尺度变化与PDO指数显著相关。夏季珊瑚δ 18 O与冬季PDO指数的超前滞后关系为1 ~ 3年，表明东亚夏季风（EASM）可能是过去100年冬季PDO变化的驱动力。冬季PDO指数和夏季珊瑚δ 18 O之间的交叉谱分析表明，最近和未来的全球变暖可能导致EASM和PDO之间更频繁和/或更强的遥相关。
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.