Results 31 to 40 of about 64 (59)

Can we estimate the period and quality-factor of the Chandler wobble using only the observed polar motion data?

Earth, Planets and Space
The clear ~ 6-year beat in the polar motion data has allowed us to consider the Chandler period (P) as ~ 1.2 years, albeit approximately, from solely the observed polar motion data.
Ryuji Yamaguchi, Masato Furuya
doaj   +1 more source

Climate‐Induced Polar Motion: 1900–2100

Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.
Abstract It has been demonstrated that the motion of the Earth's rotational pole with respect to the crust—termed polar motion—is increasingly influenced by barystatic processes, that is, continental‐ocean mass redistribution due to melting of polar ice sheets, global glaciers, and variations in terrestrial water storage.
Mostafa Kiani Shahvandi, Benedikt Soja
wiley   +1 more source

Can we explain the post-2015 absence of the Chandler wobble?

Earth, Planets and Space
Recent polar motion data do not show a 6-year beat and indicate the absence of the Chandler wobble (CW), whereas we could observe the 6-year beat even in the 1920-40 s when the CW amplitude was known to be smallest.
Ryuji Yamaguchi, Masato Furuya
doaj   +1 more source

Prospects of Predicting the Polar Motion Based on the Results of the Second Earth Orientation Parameters Prediction Comparison Campaign

Earth and Space Science, Volume 11, Issue 11, November 2024.
Abstract Growing interest in Earth Orientation Parameters (EOP) resulted in various approaches to the EOP prediction algorithms, as well as in the exploitation of distinct input data, including the observed EOP values from various operational data centers and modeled effective angular momentum functions.
Tomasz Kur, Justyna Śliwińska‐Bronowicz, Malgorzata Wińska, Henryk Dobslaw, Jolanta Nastula, Aleksander Partyka, Santiago Belda, Christian Bizouard, Dale Boggs, Sara Bruni, Lue Chen, Mike Chin, Sujata Dhar, Robert Dill, PengShuo Duan, Jose M. Ferrandiz, Junyang Gou, Richard Gross, Sonia Guessoum, Songtao Han, Robert Heinkelmann, ChengLi Huang, Christopher Irrgang, Jacek Kudrys, Jia Li, Marcin Ligas, Lintao Liu, Weitao Lu, Volker Mayer, Wei Miao, Maciej Michalczak, Sadegh Modiri, Michiel Otten, Todd Ratcliff, Shrishail Raut, Jan Saynisch‐Wagner, Matthias Schartner, Erik Schoenemann, Harald Schuh, M. Kiani Shahvandi, Benedikt Soja, Xiaoqing Su, Daniela Thaller, Maik Thomas, Guocheng Wang, Yuanwei Wu, CanCan Xu, Xueqing Xu, Xinyu Yang, Xin Zhao, Zhijin Zhou   +50 more
wiley   +1 more source

Revisiting the Excitation of Free Core Nutation

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 9, September 2024.
Abstract Earth possesses a Poincaré mode called Free Core Nutation (FCN) due to the misalignment of the rotation axes of the mantle and fluid outer core. FCN is the primary signal in the observations of Celestial Pole Offsets (CPO) and maintained by geophysical mechanisms that are yet to be understood. Earlier studies suggested an origin in Atmospheric
Mostafa Kiani Shahvandi, Michael Schindelegger, Lara Börger, Siddhartha Mishra, Benedikt Soja   +4 more
wiley   +1 more source

Evaluating the Use of Seasonal Surface Displacements and Time‐Variable Gravity to Constrain the Interior of Mars

Journal of Geophysical Research: Planets, Volume 129, Issue 6, June 2024.
Abstract The mass transport of volatiles on Mars represents a seasonally changing load on the surface of the planet. Like on Earth, as mass is redistributed across the planet, the surface responds in a complex manner becoming displaced downwards or upwards.
N. L. Wagner, P. B. James, A. I. Ermakov, M. M. Sori   +3 more
wiley   +1 more source

Improving the Accuracy of Polar Motion Prediction by Combining Least Squares and the iTransformer Model

Earth and Space Science
Polar motion prediction is an important means to study the dynamics of Earth's rotation and detect the internal structure of the Earth. This paper proposes an LS + iTransformer method that combines the least squares (LS) method with the iTransformer deep
Huizhong Zhu, Yi Yang, Chunhua Jiang, Wenfeng Nie, Zhenyu Luo, Zhangzhen Sun   +5 more
doaj   +1 more source

A pandemic of metrics

Medical Anthropology Quarterly, Volume 38, Issue 2, Page 149-163, June 2024.
Abstract The COVID‐19 pandemic prompted critical attention to the performative power of metrics. We suggest that the existential capacities of metrics as a means of pandemic living warrant further consideration. We describe how the COVID‐19 pandemic that came into existence as a public health and political event could only have occurred because of the ...
Vincanne Adams, Clare Chandler, Ann H. Kelly, Julie Livingston   +3 more
wiley   +1 more source

A Common Diffusional Mechanism for Creep and Grain Growth in Polymineralic Rocks: Application to Lower Mantle Viscosity Estimates

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 5, May 2024.
Abstract In a previous study (Okamoto & Hiraga, 2022, https://doi.org/10.1029/2022jb024638), we concluded that diffusion creep and grain growth in polymineralic rocks proceed by a common diffusional mechanism. Here, we built on that finding and estimated lower mantle grain size and viscosity during a single mantle convection cycle dominated by ...
A. Okamoto, T. Hiraga
wiley   +1 more source

Preliminary tide gauge evidence for equilibrium and non-equilibrium pole tide variability after the 2015 Chandler Wobble amplitude reduction

Earth, Planets and Space
The pole tide has been defined as the oceanic response to polar motion, with a component due to the Chandler Wobble (CW), at a period near 14 months. The magnitude of the CW was greatly reduced after about 2015, and a corresponding global attenuation of ...
Taehwan Jeon, Ki-Weon Seo, Kookhyoun Youm, Jooyoung Eom, Jianli Chen, Clark R. Wilson   +5 more
doaj   +1 more source