Results 11 to 20 of about 12,498 (259)
Geodetic residual time series: A combined series by minimization of their internal noise level
Frontiers in Earth Science, 2023 This study aims to assess the hydrological effects of polar motion calculated from different combinations of geophysical excitations at decadal, seasonal, and non-seasonal periods.
Małgorzata Wińska
doaj +1 more source
Earth, Planets and Space, 2021 Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects the orientation of the Earth’s spin axis with respect to an Earth-fixed reference system (polar motion).
Franziska Göttl +4 more
doaj +1 more source
Assimilation of Earth rotation parameters into a global ocean model: excitation of polar motion [PDF]
Nonlinear Processes in Geophysics, 2011 The oceanic contribution to Earth rotation anomalies can be manifold. Possible causes are a change of total ocean mass, changes in current speed or location and changes in mass distribution.
J. Saynisch, M. Wenzel, J. Schröter
doaj +1 more source
Excitation of Mars polar motion [PDF]
Astronomy & Astrophysics, 2006 In this paper, computations of Mars' polar motion are presented for Mars models with three homogeneous layers as a function of the radius of the inner core and for different excitation possibilities (atmosphere, ice caps, quakes). We estimated the amplitude of the two polar motion normal modes, i.e.
Dehant, V. +3 more
openaire +1 more source
Seismic excitation of the polar motion, 1977–1993 [PDF]
pure and applied geophysics, 1996 The mass redistribution in the earth as a result of an earthquake faulting changes the earth’s inertia tensor, and hence its rotation. Using the complete formulae developed by CHao and GRoss (1987) based on the normal mode theory, we calculated the earthquake-induced polar motion excitation for the largest 11,015 earthquakes that occurred during 1977.0–
Benjamin Fong Chao +2 more
openaire +1 more source
Remote Sensing, 2021 Similar to seasonal and intraseasonal variations in polar motion (PM), interannual variations are also largely caused by changes in the angular momentum of the Earth’s geophysical fluid layers composed of the atmosphere, the oceans, and in-land ...
Małgorzata Wińska
doaj +1 more source
Excitation of Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractConceptual models of polar motion have evolved over the past century, as improved data revealed signals over progressively wider frequency bands. In the 1890s, Chandler represented polar motion as a sum of discrete components, 14 month and annual terms, and this component model effectively summarized the observations, but did not provide a ...
openaire +1 more source
The atmospheric excitation of rapid polar motions [PDF]
Symposium - International Astronomical Union, 1988 Analysis of data from new, highly accurate, geodetic techniques reveals rapid polar motions. Comparison of the new geodetic data and meteorological excitation estimates shows that the observed rapid polar motions are correlated with atmospheric pressure changes, and that these changes are related to atmospheric normal modes.
T. M. Eubanks +2 more
openaire +1 more source
Earth, Planets and Space, 2021 In geodesy, a key application of data from the Gravity Recovery and Climate Experiment (GRACE), GRACE Follow-On (GRACE-FO), and Satellite Laser Ranging (SLR) is an interpretation of changes in polar motion excitation due to variations in the Earth’s ...
Justyna Śliwińska +2 more
doaj +1 more source
Remote Sensing, 2020 From 2002 to 2017, the Gravity Recovery and Climate Experiment (GRACE) mission’s twin satellites measured variations in the mass redistribution of Earth’s superficial fluids, which disturb polar motion (PM).
Jolanta Nastula, Justyna Śliwińska
doaj +1 more source