Modelling atmospheric and induced non-tidal oceanic loading contributions to surface gravity and tilt measurements. Boy, J.; Longuevergne, L.; Boudin, F.; Jacob, T.; Lyard, F.; Llubes, M.; Florsch, N.; and Esnoult, M. 48(3):182–188. Number: 3
Modelling atmospheric and induced non-tidal oceanic loading contributions to surface gravity and tilt measurements [link]Paper  doi  abstract   bibtex   
We investigate the contribution of atmospheric and its induced non-tidal oceanic loading effects on surface time-varying gravity and tilt measurements for several stations in Western Europe. The ocean response to pressure forcing can be modelled accordingly to the inverted barometer, i.e. assuming that air pressure variations are fully compensated by static sea height changes, or using ocean general circulation models. We validate two runs of the HUGO-m barotropic ocean model by comparing predicted sea surface height variations with hundred tide-gauge measurements along the European coasts. We then show that global surface pressure field, as well as a barotropic high-resolution ocean model forced by air pressure and winds allow in most cases a significant reduction of the variance of gravity residuals and, to a smaller extends tilt residuals. We finally show that precise gravity measurements with superconducting gravimeters allow the observation of large storm surges, occurring in the North Sea, even for inland stations. However, we also confirm that the continental hydrology contribution cannot be neglected. Thanks to their specific sensitivity feature, only tiltmeters closest to the coast can clearly detect the loading due to these storm surges.
@article{boy_modelling_2009,
	title = {Modelling atmospheric and induced non-tidal oceanic loading contributions to surface gravity and tilt measurements},
	volume = {48},
	issn = {0264-3707},
	url = {http://www.sciencedirect.com/science/article/pii/S0264370709000891},
	doi = {10.1016/j.jog.2009.09.022},
	series = {New Challenges in Earth's Dynamics - Proceedings of the 16th International Symposium on Earth Tides},
	abstract = {We investigate the contribution of atmospheric and its induced non-tidal oceanic loading effects on surface time-varying gravity and tilt measurements for several stations in Western Europe. The ocean response to pressure forcing can be modelled accordingly to the inverted barometer, i.e. assuming that air pressure variations are fully compensated by static sea height changes, or using ocean general circulation models. We validate two runs of the {HUGO}-m barotropic ocean model by comparing predicted sea surface height variations with hundred tide-gauge measurements along the European coasts. We then show that global surface pressure field, as well as a barotropic high-resolution ocean model forced by air pressure and winds allow in most cases a significant reduction of the variance of gravity residuals and, to a smaller extends tilt residuals. We finally show that precise gravity measurements with superconducting gravimeters allow the observation of large storm surges, occurring in the North Sea, even for inland stations. However, we also confirm that the continental hydrology contribution cannot be neglected. Thanks to their specific sensitivity feature, only tiltmeters closest to the coast can clearly detect the loading due to these storm surges.},
	pages = {182--188},
	number = {3},
	journaltitle = {Journal of Geodynamics},
	shortjournal = {Journal of Geodynamics},
	author = {Boy, Jean-Paul and Longuevergne, Laurent and Boudin, Frédéric and Jacob, Thomas and Lyard, Florent and Llubes, Muriel and Florsch, Nicolas and Esnoult, Marie-France},
	urldate = {2019-04-17},
	date = {2009-12-01},
	note = {Number: 3},
	keywords = {Storm surges, Atmospheric loading, Hydrostatic tiltmeters, Non-tidal oceanic loading, Superconducting gravimeters}
}
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