Inhaltsbereich
Publications
Abstract (EDOC: 15342)
Effective angular momentum functions from atmosphere, oceans,
and terrestrial water storage are obtained from ECMWF atmospheric data
and corresponding simulations with the ocean model OMCT and the land
surface model LSDM. Mass exchanges among the sub-systems are realized
by means of freshwater fjuxes, causing the total ocean mass to vary predom-
inantly annually. Variations in total ocean mass affect the oceanic excitations
of the annual wobble by almost 1 mas for both pro- and retrograde compo-
nents, whereas the motion term contributions of terrestrial water flow de-
rived from LSDM are found to be three orders of magnitude smaller. Since
differences to geodetic excitations are not substantially reduced, and regional
de-compositions demonstrate the large spatial variability of contributions to
seasonal polar motion excitation that compensate each other when integrated
globally, it is concluded that the closure of the seasonal excitation budget
is still inhibited by remaining model errors in all sub-systems.
(2010): Seasonal polar motion excitation from numerical models of atmosphere, ocean, and continental hydrosphere. Journal of Geophysical Research, 115, B10406.
(2010): Seasonal polar motion excitation from numerical models of atmosphere, ocean, and continental hydrosphere. Journal of Geophysical Research, 115, B10406.