Earth tides and ocean tidal loading

Jentzsch, G.

doi:10.1007/bfb0011461

Cited by 42 publications

(45 citation statements)

References 25 publications

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“…For comparison, the effect from one meter of water all over the area is calculated and the results are presented in table 2. In column 2-8 load Love numbers from PREM (Jentzsch, 1997) were used and in column 9 load Love numbers from Gutenberg-Bullen earth model were used for comparison. The second column is the effect due to the direct attraction (Eq.…”

Section: Resultsmentioning

confidence: 99%

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Effects on gravity from non-tidal sea level variations in the Baltic Sea

Olsson¹,

Scherneck²,

Ågren³

2009

Journal of Geodynamics

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The main purpose of this paper is to investigate numerically the effects of non tidal sea level variations in the Baltic Sea on gravity with special emphasis on the Swedish stations in the Nordic Absolute Gravity Project.To calculate the ocean loading effect on gravity the method described by is widely used. This method is based on convolution of a Green's function for gravity with the ocean load, but does not include the direct attraction depending on the height of the observation point. It is described how this effect is included in the Green's functions and how numerical integration is performed over a dense grid bounded by a very high resolution coastline. The importance of this high resolution is shown. The major part of the direct attraction for stations close to the coast comes from relatively small water masses close to the station. The total effect from the Baltic Sea, crustal loading and direct attraction, is calculated for twelve Swedish and one Finnish absolute gravity stations. The distance from the coast for these stations varies from 10 m to 150 km. It is shown that the total non tidal gravity effect is significant, easily reaching values of 2-3 μgal for stations with high elevation close to the coast.

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Section: Resultsmentioning

confidence: 99%

“…We have decided to use precomputed load Love numbers for the PREM (Jentzsch, 1997) and Gutenberg-Bullen earth models respectively. They are given as a sparse set with respect to degree up to a maximum degree 10,000.…”

Section: Green's Function For Small θmentioning

confidence: 99%

Effects on gravity from non-tidal sea level variations in the Baltic Sea

Olsson¹,

Scherneck²,

Ågren³

2009

Journal of Geodynamics

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“…The correction is computed by a static file, using the Cartwright tables of tidal harmonics [16][17][18]. The dynamic range is about 3 cm with amplitudes on the order of 12 cm.…”

Section: Solid Earth Tide (Set)mentioning

confidence: 99%

“…The resulting load changes cause a deformation of the earth's crust. The ocean loading tide is computed after [18,19], using a static file. For this computation, the FES2004 tide model is used.…”

Section: Ocean Loading Tide (Olt)mentioning

confidence: 99%

The Impact of Geophysical Corrections on Sea-Ice Freeboard Retrieved from Satellite Altimetry

2016

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Satellite altimetry is the only method to monitor global changes in sea-ice thickness and volume over decades. Such missions (e.g., ERS, Envisat, ICESat, CryoSat-2) are based on the conversion of freeboard into thickness by assuming hydrostatic equilibrium. Freeboard, the height of the ice above the water level, is therefore a crucial parameter. Freeboard is a relative quantity, computed by subtracting the instantaneous sea surface height from the sea-ice surface elevations. Hence, the impact of geophysical range corrections depends on the performance of the interpolation between subsequent leads to retrieve the sea surface height, and the magnitude of the correction. In this study, we investigate this impact by considering CryoSat-2 sea-ice freeboard retrievals in autumn and spring. Our findings show that major parts of the Arctic are not noticeably affected by the corrections. However, we find areas with very low lead density like the multiyear ice north of Canada, and landfast ice zones, where the impact can be substantial. In March 2015, 7.17% and 2.69% of all valid CryoSat-2 freeboard grid cells are affected by the ocean tides and the inverse barometric correction by more than 1 cm. They represent by far the major contributions among the impacts of the individual corrections.

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“…Oceanic model CSR3.0 and the Green functions on the terrestrial model of Gutenberg-Bullen, [9], which does not represent any practical difference compared with the terrestrial model PREM, were used [11]. The results obtained show that in no vertex of the net the effect of the oceanic load exceeds ± 0.4x10 -8 ms -2 during the observation period.…”

Section: Reductions Due To Tide Effectsmentioning

confidence: 99%