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Observation of the Earth’s nutation by the VLBI: how accurate is the geophysical signal
Observation of the Earth’s nutation by the VLBI: how accurate is the geophysical signal
- Source :
- Journal of Geodesy, Journal of Geodesy, Springer Verlag, 2016, Journal of Geodesy, 2016
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- International audience; We compare nutation time series determined by several International VLBI Service for geodesy and astrometry (IVS) analysis centers. These series were made available through the International Earth Rotation and Reference Systems Service (IERS). We adjust the amplitudes of the main nutations, including the free motion associated with the free core nutation (FCN). Then, we discuss the results in terms of physics of the Earth’s interior. We find consistent FCN signals in all of the time series, and we provide corrections to IAU 2000A series for a number of nutation terms with realistic errors. It appears that the analysis configuration or the software packages used by each analysis center introduce an error comparable to the amplitude of the prominent corrections. We show that the inconsistencies between series have significant consequences on our understanding of the Earth’s deep interior, especially for the free inner core resonance: they induce an uncertainty on the FCN period of about 0.5 day, and on the free inner core nutation (FICN) period of more than 1000 days, comparable to the estimated period itself. Though the FCN parameters are not so much affected, a 100% error shows up for the FICN parameters and prevents from geophysical conclusions.
- Subjects :
- 010504 meteorology & atmospheric sciences
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
[SDU.ASTR.EP] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
01 natural sciences
[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology
Geochemistry and Petrology
0103 physical sciences
Very-long-baseline interferometry
Computers in Earth Sciences
010303 astronomy & astrophysics
0105 earth and related environmental sciences
Earth's rotation
Physics
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Series (mathematics)
[SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere
Nutation
Inner core
International Earth Rotation and Reference Systems Service
Astrometry
Geophysics
Geodesy
Amplitude
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Subjects
Details
- Language :
- English
- ISSN :
- 09497714 and 14321394
- Database :
- OpenAIRE
- Journal :
- Journal of Geodesy, Journal of Geodesy, Springer Verlag, 2016, Journal of Geodesy, 2016
- Accession number :
- edsair.doi.dedup.....46f4338a0d95bb3809844722a0efbcc5