On the Validity of Environmental Parameters in Gravimetric Tidal Analyses.
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Accession number;01A0565428
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| Title;On the Validity of Environmental Parameters in Gravimetric Tidal Analyses. |
| Author;
DITTFELD H-J
(Geoforschungszentrum Potsdam(gfz), Potsdam, Deu)
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Journal Title;Journal of the Geodetic Society of Japan
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Journal Code:G0199A
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ISSN:0038-0830
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VOL.47;NO.1;PAGE.287-293(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;While the significance of air pressure coefficients in tidal analysis results is unquestionable, and their application clearly improves the results, the correlation with other environmental parameters is often weak and improvements are rather small if they are introduced. In spite of the progress in modelling in recent years, there seems to be a limit to the accuracy that can be achieved, and one has rather to look for possibilities of avoiding some environmental influences from the beginning. Some reasons for the disappointing success of this correlation are here discussed for a 6-year recording of a superconducting gravimeter operating in Potsdam. We are particularly concerned with groundwater level, room temperature, and rainfall. Even though the residual noise is more or less decreased, the results are practically independent of the influence of the additional parameters. It is shown that the correlation is not persistent enough through the data to achieve the expected improvement, or perhaps on the other the actual influences are partly screened. For example, the effect of rainfall is difficult to estimate if the water flow superficially away from the station and the soil moisture does not correspond to the precipitation at the point of the rain gauge. (author abst.) |
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