Rapid variations in polar motion during the 2005–2006 winter season
Article first published online: 1 JUL 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 13, July 2006
How to Cite
2006), Rapid variations in polar motion during the 2005–2006 winter season, Geophys. Res. Lett., 33, L13303, doi:10.1029/2006GL026422., , and (
- Issue published online: 1 JUL 2006
- Article first published online: 1 JUL 2006
- Manuscript Accepted: 24 MAY 2006
- Manuscript Revised: 19 MAY 2006
- Manuscript Received: 27 MAR 2005
 The terrestrial motion of the Earth's rotation pole shows mainly two large oscillations: the Chandler and the annual wobbles driven by mass redistributions in surface geophysical fluids. These contributions interfere destructively every 6.4 years, slowing down the pole at that period of time. This is the case for the recent period from November 2005 till February 2006. Due to the high precision of Earth orientation data of these days and for the first time in the history of polar motion observation, very small structures of the motion are observed. We compared the observed polar motion with the contribution of atmosphere and oceans predicted from global atmospheric and oceanic analyses and models. We clearly see that centimeter level polar motion displacements during the 2005–2006 winter season are almost fully explained by major pressure events on the continents and on the ocean, especially a depression over Northern Europe in-phase with similar events over North America.