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Analysis of The Itsg-Grace Daily Models in The Determination of Polar Motion Excitation Function

Aleksander Partyka
Aleksander Partyka
, 
Jolanta Nastula
Jolanta Nastula
, 
Justyna Śliwińska
Justyna Śliwińska
, 
Tomasz Kur
Tomasz Kur
 and 
Malgorzata Wińska
Malgorzata Wińska
   | Oct 10, 2023
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Published Online: Oct 10, 2023
Page range: 105 - 121
Received: Mar 13, 2023
Accepted: Jul 10, 2023
DOI: https://doi.org/10.2478/arsa-2023-0008
Keywords
© 2023 Aleksander Partyka et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Methodology flowchart, which shows all the calculation steps
Methodology flowchart, which shows all the calculation steps

Figure 2.

Comparison of the (a) χ1 and (b) χ2 components of nonseasonal series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018
Comparison of the (a) χ1 and (b) χ2 components of nonseasonal series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018

Figure 3.

Comparison of (a) χ1 and (b) χ2 amplitude spectra series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018 from 20 to 120 days
Comparison of (a) χ1 and (b) χ2 amplitude spectra series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018 from 20 to 120 days

Figure 4.

Comparison of (a) χ1 and (b) χ2 amplitude spectra series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018 from 2 to 20 days
Comparison of (a) χ1 and (b) χ2 amplitude spectra series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018 from 2 to 20 days

Figure 5.

RMSEs of ITSG 2016-based series, ITSG 2018-based series, and HAM + SLAM calculated using GAO as the reference series. The exact RMSE values are given above the bars for each series.
RMSEs of ITSG 2016-based series, ITSG 2018-based series, and HAM + SLAM calculated using GAO as the reference series. The exact RMSE values are given above the bars for each series.

Figure 6.

Varexp of ITSG 2016-based series, ITSG 2018-based series, and HAM + SLAM calculated using GAO as the reference series. The exact explained variance values are given above the bars for each series.
Varexp of ITSG 2016-based series, ITSG 2018-based series, and HAM + SLAM calculated using GAO as the reference series. The exact explained variance values are given above the bars for each series.

Figure 7.

Correlations between ITSG 2016-based series, ITSG 2018-based series, GAO, and HAM + SLAM in (a) χ1 and (b) χ2
Correlations between ITSG 2016-based series, ITSG 2018-based series, GAO, and HAM + SLAM in (a) χ1 and (b) χ2

Figure A1.

Comparison of (a) χ1 and (b) χ2 amplitude spectra series of HAM + SLAM and HAM obtained from ITSG 2016 and ITSG 2018 from 2 to 120 days
Comparison of (a) χ1 and (b) χ2 amplitude spectra series of HAM + SLAM and HAM obtained from ITSG 2016 and ITSG 2018 from 2 to 120 days

Figure A2.

Comparison of (a) χ1 and (b) χ2 amplitude spectra series of HAM + SLAM and HAM obtained from ITSG 2016 and ITSG 2018 from 2 to 20 days
Comparison of (a) χ1 and (b) χ2 amplitude spectra series of HAM + SLAM and HAM obtained from ITSG 2016 and ITSG 2018 from 2 to 20 days

Models used to produce the ITSG 2016 and ITSG 2018 series

ITSG 2016 ITSG 2018
Earth rotation IERS 2010 IERS 2010
Moon, sun, and planets ephemerides JPL DE421 JPL DE421
Earth tide IERS 2010 IERS 2010
Ocean tide EOT11a FES2014b, co-estimated
Pole tide IERS 2010 (constant mean pole) IERS 2010 (linear mean pole)
Ocean pole tide Desai 2004 (IERS 2010) Desai 2004 (IERS 2010, linear mean pole)
Atmospheric tides (S1, S2) van Dam, Ray (2010) AOD1B RL06
Atmosphere and ocean dealiasing AOD1B RL05 AOD1B RL06
Relativistic corrections IERS 2010 IERS 2010
Permanent tidal deformation Included (zero tide) Included (zero tide)

Correlation coefficients between GAO and ITSG-based HAM series computed from ITSG 2016, ITSG 2018, ITSG 2016 with changed AOD1B data (AOD1B RL06 instead of RL05), and ITSG 2018 with changed AOD1B data (AOD1B RL05 instead of RL06)

ITSG 2016 ITSG 2016 RL06 ITSG 2018 ITSG 2018 RL05
χ1 0.35 0.31 0.35 0.32
χ2 0.51 0.30 0.41 0.56

Comparison of STD, min, and max values from χ1 and χ2 nonseasonal series of GAO, HAM + SLAM, and HAM obtained from ITSG 2016 and ITSG 2018

STD [mas] Min [mas] Max [mas]
Series χ1 χ2 χ1 χ2 χ1 χ2
ITSG 2016 5.48 7.28 −15.91 −23.15 19.46 24.25
ITSG 2018 3.90 5.05 −12.04 −14.11 14.03 17.84
GAO 13.71 21.76 −67.01 −76.18 42.90 76.10
HAM + SLAM 1.99 2.24 −6.65 −7.38 6.68 7.18
eISSN:
2083-6104
Language:
English
Publication timeframe:
4 times per year
Journal Subjects:
Geosciences, other
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