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Tropospheric and stratospheric wind contributions to Earth's variable rotation from NCEP/NCAR reanalyses (2000–2005)
Article first published online: 10 JUL 2008
DOI: 10.1111/j.1365-246X.2008.03843.x
© 2008 The Authors Journal compilation © 2008 RAS
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How to Cite
Zhou, Y. H., Chen, J. L. and Salstein, D. A. (2008), Tropospheric and stratospheric wind contributions to Earth's variable rotation from NCEP/NCAR reanalyses (2000–2005). Geophysical Journal International, 174: 453–463. doi: 10.1111/j.1365-246X.2008.03843.x
Publication History
- Issue published online: 17 JUL 2008
- Article first published online: 10 JUL 2008
- Accepted 2008 May 6. Received 2007 October 19; in original form 2007 May 6
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Keywords:
- Time series analysis;
- Earth rotation variations;
- Global change from geodesy
SUMMARY
The individual tropospheric and stratospheric wind contributions to the Earth's variable rotation during the period 2000–2005 are investigated to further our understanding of the role of wind in exciting polar motion and the variation of the Earth's rotational rate (or the length of day, LOD, change). Instead of the previous empirical approach, which simply assumed the tropopause as an equal-pressure level, the present study employs a tropopause, which is space- and time-dependent and is from the National Centers for Environmental Prediction–National Center for Atmospheric Research (NCEP/NCAR) reanalyses. For the axial component, the tropospheric and stratospheric wind effects are essentially additive. For the equatorial components, however, a significant cancellation is found between the tropospheric and stratospheric wind terms, based on the NCEP/NCAR reanalysis model.