Advertisement

Changes in the Earth’s Rate of Rotation on an El Niño to Century Basis

  • Nils-Axel Mörner
Part of the NATO ASI Series book series (ASIC, volume 261)

Abstract

Accelerations and decelerations in the Earth’s rate of rotation of more than one year’s duration have generally been assumed to be balanced by corresponding core motions. It is shown, however, that changes of duration from El Niño events to 50–150 years are primarily balanced by, or rather driven by, hydrospheric motions, i.e. oceanic circulation changes. Two (or three) of the major LOD changes during the last 350 years are linked to geomagnetic “jerks”. Whilst the corresponding interchange of angular momentum primarily seems to have taken place between the “solid” Earth and the hydrosphere, the jerks seem to represent related flow changes in the outermost part of the outer core.

Keywords

Angular Momentum Gulf Stream Outer Core Virtual Geomagnetic Pole Atmospheric Angular Momentum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Barnes, R.T.H., Hide, R., White, A.A. & Wilson, C.A., 1983. Atmospheric angular momentum correlated with length of the day changes and polar motion. Proc. Roy Soc. London, A 387, 31–73.Google Scholar
  2. Courtillot, V., Ducruix, J. & Le Mouel, J-L., 1978. Sur une acceleration recente de la variation seculaire du champ magnetique terrestre. C.R. Acad. Sc. Paris 287:D, 1095–1098.Google Scholar
  3. Courtillot, V. & Le Mouel, J.-L., 1988. A reversal of geomagnetic secular variations with an emphasis on impulses (or jerks). Abstracts, the NATO Symposium on Geomagnetism and Palaeomagnetism, Newcastle upon Tyne 1988.Google Scholar
  4. Enfield, D.B. & Allen, J.S., 1980. On the structures and dynamics of monthly mean sea level anomalies along the Pacific coast of North America. J. Phys. Oceanogr., 10, 577–578.CrossRefGoogle Scholar
  5. Eubanks, T.M., Steppe, J.A., Dickey, J.O. & Callahan, P.S., 1983. A spectral analysis of the Earth’s angular momentum budget. JPL Geod. Geophys. Preprint., no.102.Google Scholar
  6. Eubanks, T.M., Dickey, J.O. & Steppe, J.A., 1984. The 1982.83 El Nino, The Southern Oscillation and changes in the length of the day. JPL Geod. Geophys. Preprint, no. 111.Google Scholar
  7. Eubanks, T.M., Steppe, J.A. & Dickey, J.O., 1986. The El Nino, the Southern Oscillation and the Earth’s Rotation. JPL Geod. Geophys. Preprint, No. 143.Google Scholar
  8. Lambeck, K. & Casenave, A., 1976. Long term variations in the length of the day and climatic change. Geophys. J.R. Astr. Soc., 46, 555–573.Google Scholar
  9. Mörner, N.-A., 1973a. Climatic changes during the last 35,000 years as indicated by land, sea and air data. Boreas, 2, 33–53.CrossRefGoogle Scholar
  10. Mörner, N.-A., 1973b. Climatic cycles during the last 35,000 years. J. interdiscipl. Cycle Res. 4, 189–192.Google Scholar
  11. Mörner, N.-A., 1984a.. Planetary, solar, atmospheric, hydrospheric and endogene processes as origin of climatic changes on the Earth. In: Climatic Changes on a Yearly to Millenial Basis (N.-A. Morner & W. Karlen, Eds.). Reidel Publ. Co., Dordrecht p. 483–507.Google Scholar
  12. Mörner, N.-A., 1984b. Climatic changes on a yearly to millenial basis. Concluding remarks. Ibid., p. 637–651.Google Scholar
  13. Mörner, N.-A., 1987a. Short-term palaeoclimatic changes. Observational data and a novel causation model. In: Climate, history, periodicity and predictability (M.R. Rampino, J.E. Sanders, W.S. Newman & L.K. Königsson, Eds.), van Nostrand Reinhold, New York, p.256–269.Google Scholar
  14. Mörner, N.-A., 1987b. Dynamic Sea Surface Changes in the Past and Redistribution of Mass and Energy. In Late Quaternary Sea-Level Changes (Y. Qin & S. Zhao, Eds.), China Ocean Press, p.26–39.Google Scholar
  15. Mörner, N.-A., 1988a. Ocean circulation changes and redistribution of energy and mass on a yearly to century time-scale. In: Long Term Changes in Marine Fish Populations (T. Wyatt, Ed.), Vigo, Spain, (in press).Google Scholar
  16. Mörner, N.-A., 1988b. Terrestrial variations within given energy, mass and momentum budgets; palaeoclimate, sea level, palaeomagnetism, differential rotation and geodynamics. In: Secular Solar and Geomagnetic Variations in the last 10,000 years (F.R. Stephenson & A.W. Wolfendale, Eds.), Reidel Publ. Co., Dordrecht, (in press).Google Scholar
  17. Mörner, N.-A., 1988c. The Earth’s differential rotation; hydrospheric changes. AGU, Geophys. Monograph. Series, (in press).Google Scholar
  18. Mörner, N.-A., & Karlén, W. (Eds.), 1984. Climatic Changes on a Yearly to Millenial Basis. Reidel Publ. Co., Dordrecht, 667 pp.Google Scholar
  19. Mörner, N.-A & Sylwan, C.A., 1988. Detailed palaeomagnetic record for the last 6300 years from varved lake deposits in northern Sweden. This volume.Google Scholar
  20. Rochester, M.G., 1984. Causes of fluctuations in the rotation of the Earth. Phil. Trans. R. Soc. Lond., A 313, 95–105.CrossRefGoogle Scholar
  21. Rosen, R.D. & Salstein, D.A., 1983. Variations in atmospheric angular momentum on global and regional scales and the length of the day. J. Geophys. Res., 36, 5451–5470.CrossRefGoogle Scholar
  22. Stephenson, F.R. & Morrison, L.V., 1984. Long-term changes in the rotation of the Earth: 700 B.C. to A.D. 1980. Phil. Trans. Soc. Lond., A 313, 47–70.CrossRefGoogle Scholar
  23. Taira, K., 1981. Holocene tectonism in eastern Asia and geoid changes. Palaeogeogr. Palaeoclim. Palaeocol., 36, 75–85.CrossRefGoogle Scholar
  24. WCDP, 1985. The global climate system. Climatic System Monitoring (CMS) of the World Climate Data Program (WCDP), WMO, Geneva, 52 ppGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Nils-Axel Mörner
    • 1
  1. 1.Paleogeophysics & GeodynamicsGeological InstituteStockholmSweden

Personalised recommendations