NATIONAL REPORT OF THE FEDERAL REPUBLIC OF ... - IAG Office

86 Commission 3 – Earth Rotation and Geodynamics
model is performed in the Adriatic, a semi-enclosed basin
in the Mediterranean Sea, by comparing model sea-surface
elevation with tide-gauge and TOPEX/POSEIDON data,
and model bottom pressure with that estimated from
temperature and salinity observations. Using the ECCO
model ocean bottom pressure data and the Green's functions
approach, the non-tidal ocean loading effect has been
modelled at the four GPS sites. The height series and the
predicted non-tidal ocean loading are highly correlated at
all four stations. A similar analysis is also presented for the
superconducting gravimeter data collected at the Medicina
station (ZERBINI et al. 2004).
In contrast to the long-term variations in the atmosphere
the high frequency band excite seismometers and gravimeters
in a different manner. Acceleration power spectral
densities of vertical seismic noise at the best seismic
stations show a minimum near 3 mHz. This minimum is
caused by a cancellation near this frequency of Newtonian
attraction vs. free air and inertial effects exerted by atmospheric
phenomena on the sensor mass. Simplistic models
of atmospheric phenomena are used to quantify this effect
and examples are shown for special atmospheric events in
ZÜRN and WIELANDT (2007).
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