Drift of the Earth’s Principal Axes of Inertia from GRACE and Satellite Laser Ranging Data

Ferrándiz, José M.; Modiri, Sadegh; Belda, Santiago; Barkin, M. Yu.; Bloßfeld, M; Heinkelmann, Robert; Schuh, Harald

doi:10.3390/rs12020314

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…A more detailed work of the seismic effect of J 2 will be presented in the future. A secular drift of the principal moment of inertia of the Earth has also been reported during what is known as the Gravity Recovery and Climate Experiment (GRACE) era (Férrandiz et al., 2020), of which the origin could be analyzed by taking the estimated Δ T into account in the future. It is known that the secular change of LOD is mainly induced by the tidal friction (+12 μs/yr).…”

Section: Discussionmentioning

confidence: 94%

Seismic Contributions to Secular Changes in Global Geodynamic Parameters

Chun

2022

JGR Solid Earth

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Global geodynamic changes, that is, low-frequency geodynamic changes, include changes in the low-degree zonal coefficients of Earth's gravity field (e.g., dynamic oblateness J 2 ) and three-dimensional Earth rotation in polar motion and length of day (hereinafter, polar motion [PM] and LOD, respectively) resulting from internal mass redistribution (Chao & Ding, 2016;Ivins & Sammis, 1995). The secular (i.e., nonlinear) changes of geodynamic parameters can reveal dynamic processes with different spatiotemporal scales in the solid Earth system and mass transport in surface geophysical fluids (cf., Cazenave & Nerem, 2002).The secular change in Earth rotation (mainly PM, McCarthy & Luzum, 1996) and J 2 (Cheng & Tapley, 2004) is proverbially dominated by the glacier isostatic adjustment (GIA) effect but not fully (cf., Adhikari et al., 2018; also see Figure 1). What drives the residual of secular change in geodynamic parameters? Potential causes can be global plate tectonics (Spada et al., 1992), mantle convection (Steinberger & O'Connell, 1997), and surface geophysical fluids (Adhikari & Ivins, 2016). Moreover, dramatic changes in the secular trends (around 1998, see Figure 1) in geodynamic parameters became evident and were determined to have largely been caused (∼80%) by recent climate-driven mass migration of surface geophysical fluids due to global warming (Adhikari &

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Section: Discussionmentioning

confidence: 94%

Seismic Contributions to Secular Changes in Global Geodynamic Parameters

Chun

2022

JGR Solid Earth

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EOP Prediction Based on Multi and Single Technique Space Geodetic Solution

Modiri,

Thaller,

Belda

et al. 2024

International Association of Geodesy Symposia

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Real-time Earth Orientation Parameters (EOP) are crucial in various space geodetic applications, from satellite navigation to weather forecasting. This study introduces a refined prediction package leveraging diverse EOP series from the Federal Agency of Cartography and Geodesy (BKG), including rapid and final series, Satellite Laser Ranging (SLR) series, and International Earth Rotation and Reference Systems Service (IERS) C04. Our approach yields substantial improvements in EOP prediction accuracy. Results highlight superior performance in critical parameters such as Polar Motion, (UT1-UTC) dUT1, and Length of Day (LOD) predictions. Notably, our predictions surpass benchmarks from the Second EOP Prediction Comparison Campaign (2nd EOP-PCC)” organized by International Association of Geodesy (IAG) and IERS, showcasing the effectiveness of our methodology. Additionally, BKG’s Rapid EOP stands out with remarkable accuracy, featuring a shorter latency of 1 to 2 days. This study contributes to our understanding of Earth’s rotational dynamics. It provides practical advancements in real-time EOP predictions, demonstrating the potential impact on a wide range of scientific and operational applications.

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Advancing polar motion prediction with derivative information

Michalczak,

Ligas,

Belda

et al. 2024

Journal of Applied Geodesy

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Earth Orientation Parameters (EOP) are essential for monitoring Earth’s rotational irregularities, impacting satellite navigation, space exploration, and climate forecasting. This study introduces a hybrid prediction model combining least-squares (LS) and vector autoregression (VAR) to improve Earth’s Pole Coordinates (x, y) forecast accuracy. Using daily sampled IERS EOP 20 C04 data from 2013 to 2023, we conducted 1,000 yearly random trials, performing 48 forecasts per year. Our method evaluates six data combinations, including primary variables (x, y) and their derivatives ( x ̇ , y ̇ $\dot{x},\dot{y}$ ). Results show a systematic improvement in prediction accuracy, especially for ultra-short-term forecasts (10 days into future), with derivative information stabilizing the solutions. The best-performing combination ( x , y , x ̇ , y ̇ $x,y,\dot{x},\dot{y}$ ) achieved a mean absolute prediction error (MAPE) reduction (with respect to the reference data combination – x, y) of up to 8 % for the y and 7 % for the x over a whole 30-day forecast horizon. These findings highlight the effectiveness of incorporating derivatives of polar motion time series into prediction procedure.

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Drift of the Earth’s Principal Axes of Inertia from GRACE and Satellite Laser Ranging Data

Cited by 3 publications

References 28 publications

Seismic Contributions to Secular Changes in Global Geodynamic Parameters

Seismic Contributions to Secular Changes in Global Geodynamic Parameters

EOP Prediction Based on Multi and Single Technique Space Geodetic Solution

Advancing polar motion prediction with derivative information

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