North Pacific Decadal Climate Variability Since AD 1661 |
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North Pacific Decadal Climate Variability Since AD 1661 Journal of Climate, Volume 14, Number 1, pp. 5-10, January 2001. Franco Biondi Department of Geography, University of Nevada. Alexander Gershunov Scripps Institute of Oceanography Daniel R. Cayan Scripps Institute of Oceanography and US Geological Survey |
ABSTRACT: Climate in the North Pacific and North American sectors has experienced interdecadal shifts during the 20th century. A network of recently developed tree-ring chronologies for Southern and Baja California extends the instrumental record, and reveals decadal-scale variability back to AD 1661. The Pacific Decadal Oscillation (PDO) is closely matched by the dominant mode of tree-ring variability, which provides a preliminary view of multi-annual climate fluctuations spanning the past four centuries. The reconstructed PDO index features a prominent bidecadal oscillation, whose amplitude weakened in the late 1700s to mid-1800s. A comparison with proxy records of ENSO suggests that the greatest decadal-scale oscillations in Pacific climate between 1706 and 1977 occurred around 1750, 1905, and 1947. |
DATA: Download the Reconstructed PDO time series and description from the WDC Paleo Archive.
Download the tree-ring data used in this study: |
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To read or view the full study, please visit the
American Meteorological Society website. It was published in Journal of Climate Volume 14, Number 1, pp. 5-10, January 2001. |
Fig. 5 (below) PDO-ENSO patterns from 1706 to 1977, obtained by adding the proxy PDO record (Fig. 3) with a proxy record of winter Southern Oscillation Index derived by Stahle et al. (1998) Both series were first converted to standard deviation units, and the sign of the SOI was reversed to make El Nino years positive. Absolute values are higher (lower) during constructive (destructive) interference between PDO and ENSO. | ||||||
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Contact Us National Oceanic and Atmospheric Administration 12 Jan 2001
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