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Tropical Pacific and Northern Hemisphere influences on the coherence of Pacific Decadal Oscillation reconstructions
Author(s) -
Wise Erika K.
Publication year - 2015
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.3966
Subject(s) - pacific decadal oscillation , climatology , northern hemisphere , southern hemisphere , proxy (statistics) , coherence (philosophical gambling strategy) , pacific basin , oscillation (cell signaling) , environmental science , geology , el niño southern oscillation , oceanography , physics , quantum mechanics , machine learning , biology , computer science , genetics
Proxy‐based reconstructions of the Pacific Decadal Oscillation ( PDO ) are essential for understanding pre‐instrumental variability in this low‐frequency oscillation. Multiple reconstructions of the PDO exist but demonstrate weak coherence prior to the 20th century. Analyses of atmospheric moisture and pressure patterns in teleconnected tree‐ring sites used for the reconstructions indicate that terrestrial climate impact patterns associated with northern Pacific conditions have been spatially variable over the instrumental period. Tropical Pacific and Northern Hemisphere climate modes influence these surface patterns and are reflected in the PDO reconstructions. Divergence prior to the 20th century calibration period may be due to time‐dependent nonlinearities in the PDO and changes in the influence of the El Niño‐Southern Oscillation system over time.