DBPapers
DOI: 10.5593/SGEM2014/B51/S20.061

MODERN APPROACH FOR DETERMINATION OF ABSOLUTE CLIMATE EUSTAZY

G. Metreveli, K. Bilashvili, N. Tsivtsivadze, M. Goginava, R. Diasamidze, M. Beridze
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-17-9 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 1, 453-460 pp

ABSTRACT
A statistical method of the absolute eustasy (ECa) calculation, one of the major
parameters of World Ocean (WO) level fluctuation, caused by climate change, is used. This parameter specifies to a sea level fluctuation relatively to its starting position and numerically is equal to sum of relative eustasy (Ecr mm/year) and the value of "geological trend", i.e. the velocity of shore secular vertical movement (C mm/year) The starting position of sea level is its value at the beginning of the current global warming, which changes according to latitudes. Therefore, if level statistical series (LCS) covers the periods before and after the current climate fluctuation (so-called "long statistical series), it should be split into two fragments and Eca value calculation make by the second of them, using the equality ECa = Ecr  C. As along the WO shores geological trend varies widely (glacioizostatic processis, tectonics, ground’ subsiding, etc.), where C > Ecr, the sea level is reduced relatively to shore (Ecr<0), but not relative to its starting value (Eca > 0). Throughout the WO regions Eca > 0, but has different values depending on the coefficient of thermal expansion of sea water and incoming discharge to WO, from the long-term stocks of land water. The main features of the ECa = ƒ (Ecr, C), as well as Eca calculation are presented in table and conclusions.

Кеуwords: eustasy, level series, climate, subsiding.