Venue: EGU General Assembly, Vienna, Austria
Tamisiea, M.E., E.M. Hill, R.M. Ponte, and J.L. Davis, 2006. The hydrological cycle and sea level variations, EGU General Assembly, Vienna, Austria, April 2006.
Resource Link: meetings.copernicus.org/www.cosis.net/abstracts/.../EGU06-J-08848.pdf
Creating a consistent framework for understanding sea level change over a range of time scales requires inputs from ocean dynamics, knowledge of freshwater ﬂux between the oceans and continents, and an understanding of how crustal deformation
and time-variable gravity caused by changing loads on the continents impact local observations of sea level. In this presentation, we discuss the sea level variations resulting from the hydrological cycle, which is the primary signal in the time-variable gravity ﬁeld. Only static sea level variations are considered. On annual time scales, the hydrological cycle contributes to the variation of sea level through both global and local effects. Previous studies have shown that the exchange of water between the oceans and the continents is the dominant contribution to the globally-averaged, nonsteric annual sea level variation. We ﬁnd that crustal motion and variations in gravity impact local measurements of sea level, producing signiﬁcant differences from the global signal in both the amplitude and phase. These predictions of the hydrological cycle’s inﬂuence on satellite altimetry and tide gauge observations are determined using a self consistent model that simultaneously accounts for freshwater ﬂux, crustal motion and gravity variations. We also examine initial results of extracting this signal from a set of global tide gauges.