A Pacific Decadal Oscillation record since 1470 AD reconstructed from proxy data of summer rainfall over eastern China

Details A Pacific Decadal Oscillation record since 1470 AD reconstructed from proxy data of summer rainfall over eastern China A Pacific Decadal Oscillation record since 1470 AD reconstructed from proxy data of summer rainfall over eastern China

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3303702s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 3, CiteID L03702

Physics

18

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Paleoclimatology (0473, 4900), Atmospheric Processes: Precipitation (1854), Geographic Location: Asia

Scientific paper

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.

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