A New Global Mode of Earth Deformation: Seasonal Cycle Detected
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- 14 December 2001
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 294 (5550) , 2342-2345
- https://doi.org/10.1126/science.1065328
Abstract
We have detected a global mode of Earth deformation that is predicted by theory. Precise positioning of Global Positioning System sites distributed worldwide reveals that during February to March, the Northern Hemisphere compresses (and the Southern Hemisphere expands), such that sites near the North Pole move downward by 3.0 millimeters, and sites near the equator are pulled northward by 1.5 millimeters. The opposite pattern of deformation occurs during August to September. We identify this pattern as the degree-one spherical harmonic response of an elastic Earth to increased winter loading of soil moisture, snow cover, and atmosphere. Data inversion shows the load moment's trajectory as a great circle traversing the continents, peaking at 6.9 × 1022 kilogram meters near the North Pole in winter, indicating interhemispheric mass exchange of 1.0 × 1016 ± 0.2 × 1016 kilograms.Keywords
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This publication has 14 references indexed in Scilit:
- Crustal displacements due to continental water loadingGeophysical Research Letters, 2001
- The role of the Siberian high in northern hemisphere climate variabilityGeophysical Research Letters, 2001
- Interhemispheric oscillations in the surface air pressure fieldGeophysical Research Letters, 2001
- Methodology for global geodetic time series estimation: A new tool for geodynamicsJournal of Geophysical Research, 2000
- Geophysical interpretation of observed geocenter variationsJournal of Geophysical Research, 1999
- Modeling environment loading effects: a reviewPhysics and Chemistry of the Earth, 1998
- Some remarks about the degree-one deformation of the EarthGeophysical Journal International, 1997
- Effect of melting glaciers on the Earth's rotation and gravitational field: 1965-1984Geophysical Journal International, 1992
- Satellite sensor estimates of northern hemisphere snow volumeInternational Journal of Remote Sensing, 1990
- Deformation of the Earth by surface loadsReviews of Geophysics, 1972