Multichannel singular spectrum analysis of the axial atmospheric angular momentum
作者： Leonid Zotov , N.S. Sidorenkov , Ch. Bizouard , C.K. Shum , Wenbin Shen
DOI: 10.1016/J.GEOG.2017.02.010
关键词:
摘要: Abstract Earth's variable rotation is mainly produced by the variability of AAM (atmospheric angular momentum). In particular, axial component χ3, which undergoes especially strong variations, induces changes in rate. this study we analysed maps regional input into effective from 1948 through 2011 NCEP/NCAR reanalysis. Global zonal circulation patterns related to LOD (length day) were described. We applied MSSA (Multichannel Singular Spectrum Analysis) jointly mass and motion components AAM, allowed us extract annual, semiannual, 4-month, quasi-biennial, 5-year, low-frequency oscillations. PCs (Principal components) strongly ENSO (El Nino southern oscillation) released. They can be used ENSO-induced pressure wind fields their coupling LOD. The describing trends have captured slow atmospheric possibly climate variability.
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