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Evidence for a signal near 19 years is found in 51 out of 65 rain gauge records in the tri-state region of Arkansas, Louisiana, and Mississippi, While another term with period 10 to 11 years is found in 39 instances. These are identified as the 18.6-year luni-solarM
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and solar cycleS
c
signals in climate variability. In terms of both amplitude and phase the luni-solar wave trains are highly nonstationary; in particular, the waves commonly change phase by 180°. Examples of theM
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andS
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terms in corn yield for Arkansas and Missouri are presented, and the implications for economic science briefly discussed. 相似文献
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Robert G. Cùrrie 《Pure and Applied Geophysics》1991,137(3):281-300
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 thet-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
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term reported earlier byCurrie (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
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signal are nonstationary with respect to both time and geography. In particular, abrupt 180° phase changes in wave polarity are often observed. 相似文献
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