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A Pacific Decadal Oscillation record since 1470 AD reconstructed from proxy data of summer rainfall over eastern China
Author(s) -
Shen Caiming,
Wang WeiChyung,
Gong Wei,
Hao Zhixin
Publication year - 2006
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 - 10.1029/2005gl024804
Subject(s) - proxy (statistics) , pacific decadal oscillation , climatology , china , geology , el niño southern oscillation , southern oscillation , geography , archaeology , machine learning , computer science
Recent studies indicated that the spatial pattern and temporal variability of summer rainfall over eastern China are well correlated with the Pacific Decadal Oscillation (PDO). Here we used a data set of the drought/flood index (a proxy of summer rainfall) since 1470 AD to reconstruct the annual PDO index. The reconstruction indicates that the PDO is a robust feature of North Pacific climate variability throughout the study period, however, the major modes of oscillation providing the basic PDO regime timescale have not been persistent over the last 530 years. The quasi‐centennial (75–115‐yr) and pentadecadal (50–70‐yr) oscillations dominated the periods before and after 1850, respectively. Our analysis suggest that solar forcing fluctuation on quasi‐centennial time scale (Gleissberg cycle) could be the pace‐maker of the PDO before 1850, and the PDO behavior after 1850 could be due, in part, to the global warming.