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On the similar to 7 year periodic signal in length of day from a frequency domain stepwise regression method
Hsu, Can-Can1,3; Duan, Peng-Shuo1,2; Xu, Xue-Qing1,2; Zhou, Yong-Hong1,2,3; Huang, Cheng-Li1,2,3
2021-05-01
Source PublicationJOURNAL OF GEODESY
ISSN0949-7714
Volume95Issue:5Pages:15
AbstractThe intradecadal variations in length-of-day (LOD) and their time-varying characteristics still need to be further studied. Given that the corresponding signal periods on the intradecadal scales are quite close to each other and the span of currently observed Delta LOD data (i.e., 1962-2019, only 57 years) is not long enough, accurate detection of these signals depends on using effective mathematical method. On the basis of the traditional harmonic retrieval model, this work proposes a frequency domain stepwise regression method, which can well identify the periodic components with close periods and recognize the weaker signals to estimate the relevant harmonic parameters (i.e., amplitude, frequency and phase). Furthermore, we apply this method to detection of the actual LOD intradecadal variations, the result of which shows that there are three components (i.e., the similar to 5.9 years, similar to 8.3 years and similar to 7.3 years) existing in LOD intradecadal variations. Here, we firstly give the time-domain harmonic expression of the similar to 7.3 years signal, i.e., y(t) = Acos(2 pi/T(t - 1962 + psi), where the period T = 7.33 years, amplitude A = 0.0413(+/- 0.0099) ms, phase psi = -1.58(+/- 0.30) years. The mechanism of this similar to 7.3 years signal needs to be further studied.
KeywordLOD Intradecadal variations AR-z spectrum Frequency domain stepwise regression Frequency domain least squares
Funding OrganizationB-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1007/s00190-021-01503-x
WOS KeywordATMOSPHERIC ANGULAR-MOMENTUM ; OSCILLATION ; ROTATION ; PARAMETERS ; EARTH
Language英语
Funding ProjectB-type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China[11371037] ; National Natural Science Foundation of China[11673049] ; National Natural Science Foundation of China[11803064] ; National Natural Science Foundation of China[11773058] ; National Natural Science Foundation of China[11773057]
Funding OrganizationB-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; B-type Strategic Priority Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics ; Remote Sensing
WOS SubjectGeochemistry & Geophysics ; Remote Sensing
WOS IDWOS:000644117800003
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77903
Collection中国科学院国家天文台
Corresponding AuthorDuan, Peng-Shuo; Xu, Xue-Qing
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, CAS Key Lab Planetary Sci, Shanghai, Peoples R China
3.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Hsu, Can-Can,Duan, Peng-Shuo,Xu, Xue-Qing,et al. On the similar to 7 year periodic signal in length of day from a frequency domain stepwise regression method[J]. JOURNAL OF GEODESY,2021,95(5):15.
APA Hsu, Can-Can,Duan, Peng-Shuo,Xu, Xue-Qing,Zhou, Yong-Hong,&Huang, Cheng-Li.(2021).On the similar to 7 year periodic signal in length of day from a frequency domain stepwise regression method.JOURNAL OF GEODESY,95(5),15.
MLA Hsu, Can-Can,et al."On the similar to 7 year periodic signal in length of day from a frequency domain stepwise regression method".JOURNAL OF GEODESY 95.5(2021):15.
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