Luni-solar 18.6-year signal in tree-rings from Argentina and Chile

Details Luni-solar 18.6-year signal in tree-rings from Argentina and Chile Luni-solar 18.6-year signal in tree-rings from Argentina and Chile

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991papge.137..281c&link_type=abstract

Pure and Applied Geophysics PAGEOPH, Volume 137, Issue 3, pp.281-300

Physics

Geophysics

7

Luni-Solar, 18.6-Year Drought, Drought In Argentina And Chile, Maximum Entropy Spectrum Analysis

Scientific paper

Spectrum analysis of 32 tree-ring chronologies from Argentina and Chile yields evidence for two peaks with periods 19.2±1.6 years (30 out of 32 records) and 10.5±0.4 years in 22 instances. Tests by the t-statistic show that the long-period peak is significant at a confidence level of 99%. This signal is identified as the luni-solar 18.6-year M n term reported earlier by Currie (1983) in two treering chronologies from the same region, and later in tree-rings from North America, Tasmania, New Zealand, and South Africa ( Currie, 1991a-c). Amplitude and phase of the M n signal are nonstationary with respect to both time and geography. In particular, abrupt 180° phase changes in wave polarity are often observed.

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