Wednesday, February 01, 2012

Geodynamics and the mean sea level

The long term periodic, and particularly, the secular changes in the mean sea level (MSL) are important in geodynamics when only linear movements are considered. The global mean secular sea level variations (eustatic) have been estimated by Carrera and Vaníček (1988), Douglas (1991), and (Peltier, 1996, 2001). The most probable contributor to eustatic variations are the melting of Antarctica’s, as well as other permanent ice sheets on the Earth surface, and the continuing adjustment of the lithosphere-asthenosphere system to the load of water freed after the last de-glaciation (Vaníček and Krakiwsky, 1986). The apparent sea level rise left after removal of the global eustatic signal is assumed to represent a vertical motion of the crust of the same magnitude but of opposite sign.

Carrera, G., and Vaníček, P. (1988). A comparison of present sea level linear trends from tide gauge data and radiocarbon curves in Eastern Canada. Palaeogeography, Palaeoclimatology, Palaeoecology, 68(2-4), 127-134, doi:10.1016/0031-0182(88)90035-1.

Douglas, B. C. (1991). Global sea level rise. Journal of Geophysical Research, 96(C4), 6981-6992.

Peltier, W. R. (1996). Global sea level rise and glacial isostatic adjustment: An analysis of data from the East Coast of North America. Geophysical Research Letters, 23(7), 717, doi:10.1029/96GL00848.

Peltier, W. R. (2001). Global glacial isostatic adjustment and modern instrumental records of relative sea level history. International Geophysics, 75, 65-95, doi:10.1016/S0074-6142(01)80007-3.

Vaníček, P., and Krakiwsky, E. J. (1986). Geodesy: the concepts (2nd ed., p. 697). Amsterdam, The Netherlands: North-Holland.

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