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• W1530373330 abstract "We examined a newly constructed tree ringtemperature variability record from the western Himalayan regions to investigate trend and periodic signatures, if any, and their possible link with external and/or internal forcing. Two powerful spectral techniques, e.g. multi-taper method (MTM) and wavelet transform analysis were used to identify coherent periodic and non-stationary modes in the data. MTM spectral analyses of the tree-ring record spanning from AD 1200 to about AD 2000 revealed evidence for statistically significant, at more than 95% confidence level, periodicities in the range of inter-annual 3.5-8.9 years and a multi-decadal 35-40 years frequency band. A detailed analysis by dividing the record into two parts, AD 1200-1600 and AD 1600-2000 years, further suggests that a quasiperiodicity of 65-90 years was also dominant in the later part of the record. Solar forcing fluctuation on this time scale (Gleissberg cycle) could be the pacemaker of the temperature variability and global warming. Higher frequency signals in ENSO and North Atlantic Oscillation (NAO) continue to be recorded by tree rings and match well with the above frequency bands signifying their possible linkages. Wavelet spectral analysis of the same data also revealed almost similar periodicities with intermittent cyclic pattern. Cross and coherency spectra between NAO and temperature records further emphasize the link. A striking feature of the wavelet power spectra, however, is the sudden 'breakdown' in spectral power along the multidecadal cycle of 30-40 years, which might suggest a phase change in forcing mechanism leading to fundamental reorganization in land-ocean-atmospheric processes." @default.
• W1530373330 created "2016-06-24" @default.
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• W1530373330 date "2009-01-01" @default.
• W1530373330 modified "2023-09-27" @default.
• W1530373330 title "Periodicities and non-stationary modes in tree rings temperature variability record of the western Himalayas by multitaper and wavelet spectral analyses." @default.
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