Detection of different-time-scale signals in the length of day variation based on EEMD analysis technique
作者： Wenbin Shen , Cunchao Peng
DOI: 10.1016/J.GEOG.2016.05.002
关键词: Meteorology 、 Earth's rotation 、 Geodesy 、 Variation (astronomy) 、 Coincidence 、 Atmosphere 、 Hilbert–Huang transform 、 Amplitude 、 Series (stratigraphy) 、 Mathematics 、 Scale (descriptive set theory)
摘要: Abstract Scientists pay great attention to different-time-scale signals in the length of day (LOD) variations ΔLOD, which provide signatures Earth's interior structure, couplings among different layers, and potential excitations ocean atmosphere. In this study, based on ensemble empirical mode decomposition (EEMD), we analyzed latest time series ΔLOD data spanning from January 1962 March 2015. We observed with periods amplitudes about 0.5 month 0.19 ms, 1.0 0.5 yr 0.22 ms, 1.0 yr 0.18 ms, 2.28 yr 0.03 ms, 5.48 yr 0.05 ms, respectively, coincidence results predecessors. addition, some that were previously not definitely by predecessors detected 9.13 d 0.12 ms, 13.69 yr 0.10 ms, respectively. The mechanisms LOD fluctuations these two are still open.
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