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Changes in the atmospheric pressure loading service
There are several changes in the atmospheric pressure loading service:
1) Currently, the atmospheric pressure loading service provides station
displacements with respect to the center of the solid Earth, while
the service of the atmospheric contribution to gravity provides atmospheric
contribution to geopotential of the total Earth: the solid Earth and
the atmosphere. In order to eliminate this inconsistency, the new series
of displacements with respect to the total Earth, the solid Earth and
the atmosphere are being computed. The new series will replace existing
in mid June 2005.
2) The displacements caused by S1, S2 variations of the atmospheric pressure
with respect to the total Earth has already been computed and are available
These displacements were computed for both 619 sites and for nodes of the
1.0x1.0 deg grid. These displacements were computed for both cases when
the inverted barometer hypothesis is invoked and when the ocean response
is considered the same as the land response.
A small error in re-gridded Ponte-Ray model reported by T. van Dam has
3) Numerous plots of gridded amplitudes and phases of the S1 and S2 atmospheric
pressure variations, Up, East and North components of displacements
caused by loading for both the IB and non-IB cases were posted at the
atmospheric pressure loading Web page.
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