Article (Scientific journals)
Topographically corrected atmospheric loading effects
van Dam, Tonie; Altamimi, Z.; Collileux, X. et al.
2010In Journal of Geophysical Research, (115), p. 5-6
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Keywords :
environmental loading effects; atmospheric loading; GPS
Abstract :
[en] Atmospheric pressure variations are known to induce vertical displacements of the Earth’s surface with magnitudes large enough to be detected by geodetic observations. Estimates of these loading effects are derived using global reanalysis fields of surface pressure as input. The input surface pressure has a minimum spatial sampling, which does not capture true surface pressure variations due to high topographic variability in some regions. In this paper, we investigate the effect that unmodeled topographic variability has on surface pressure estimates and subsequent estimates of vertical surface displacements. We find that the estimated height changes from the topographic surface pressure can be significant (2–4 mm) for sites in regions of high topographic variability. When we compare the estimated height changes to Global Positioning System residuals from the 2005 International Terrestrial Reference Frame Realization, we find that the heights derived from the topographic surface pressure, versus those from the normal surface pressure, perform better at reducing the scatter on the height coordinate time series.
Disciplines :
Earth sciences & physical geography
Physics
Identifiers :
UNILU:UL-ARTICLE-2011-033
Author, co-author :
van Dam, Tonie ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Altamimi, Z.;  IGN/LAREG and GRGS, France
Collileux, X.;  IGN/LAREG and GRGS, France
Ray, J.;  NGS, NOAA, USA
Language :
English
Title :
Topographically corrected atmospheric loading effects
Publication date :
2010
Journal title :
Journal of Geophysical Research
ISSN :
2156-2202
Publisher :
American Geophysical Union (AGU), Washington, United States - District of Columbia
Issue :
115
Pages :
5-6
Peer reviewed :
Peer Reviewed verified by ORBi
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