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Logo: Sonderforschungsbereich geo-Q
Logo Leibniz Universität Hannover
Logo: Sonderforschungsbereich geo-Q
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C05 - Modeling of mass variations down to small scales

Gravity changes from GRACE and absolute gravimetry (Gitlein, 2009)
Gravity changes from GRACE and absolute gravimetry (Gitlein, 2009)

The performance of new sensors and system configurations opens an extended new field of applications, as then also small-scale mass variations in the Earth system can be observed. This project aims at two major objectives that are relevant for the success of geo-Q and support the maximum exploitation of the novel sensor data. First, we will thoroughly demonstrate the great potential of the new technology using mass variations in the Fennoscandian land uplift area, which are dominated by Glacial Isostatic Adjustment (GIA). We will derive a mainly data-driven model of the relevant mass changes in Fennoscandia, which are related to GIA, atmosphere and hydrology including variations of ground water and of the Baltic Sea. This model, added by the data set of Gruber et al. (2011) to also cover long-wavelength parts of the gravity field, will be applied to estimate how sensitive the observed satellite signals are with respect to various geophysical contributions and to uncertainties in the model parts. With our model that shall be supported by the novel satellite and terrestrial gravimetry data in future, we will also help to constrain the small-scale geodynamic transition zones (GIA forebulge) and to understand changes in small hydrological basins such as the Baltic Sea. Here, a further research task will cover the separation of various signal parts from the integral satellite observations (backward modeling), especially in our region but also – indirectly – in other areas.

The second objective of this project addresses the problem of de-aliasing of satellite gravity data, i.e. the reduction of high-frequency mass variations during data processing. Uncertainties in the modeling of daily atmospheric or non-modeled hydrological mass changes smear into the monthly global gravity field solutions. We will study if regional models can help in de-aliasing satellite observations, especially our model of mass variations in Fennoscandia. This may even allow the recovery of all global geopotential coefficients with higher accuracy. De-aliasing shall further be improved by applying modified analysis procedures using the knowledge about the expected signal.

Water level change of the Baltic Sea within two days and with two different wind directions
Water level change of the Baltic Sea within two days and with two different wind directions

Scientists working on this project

Balaji Devaraju
email: devarajuife.uni-hannover.de

phone: +49 511 762-17693
details

Lars Leßmann
email: lessmannife.uni-hannover.de

phone: +49 511 762-17693
details

Dr. Akbar Shabanloui
email: shabanlouiife.uni-hannover.de

phone: +49 511 762-5149
details

Selected Publications


Peer-Reviewed Literature

Shabanloui A. and Müller J. (2016): Mass variations in the Siberian permafrost region based on new GRACE results and auxiliary modeling, International Association of Geodesy Symposia, pp. 1–8.
DOI: 10.1007/1345_2015_186

Vishwakarma B. D., Devaraju B. and Sneeuw N. (2016): Minimizing the effects of filtering on catchment scale GRACE solutions, Water Resour. Res., 52, 5868–5890
DOI: 10.1002/2016WR018960

Francis O., Baumann H., Ullrich C., Castelein S., Van Camp M., de Sousa M.A., Melhorato R.L., Li C., Xu J., Su D., Wu S., Hu H., Wu K., Li G., Li Z., Hsieh W.-C., Pálinkás V., Kostelecký J., Mäkinen J., Näränen J., Merlet S., Pereira Dos Santos F., Gillot P., Hinderer J., Bernard J.-D., Le Moigne N., Fores B., Gitlein O., Schilling M., Falk R., Wilmes H., Germak A., Biolcati E., Origlia C., Iacovone D., Baccaro F., Mizushima S., De Plaen R., Klein G., Seil M., Radinovic R., Sekowski M., Dykowski P., Choi I.-M., Kim M.-S., Borreguero A., Sainz-Maza S., Calvo M., Engfeldt A., Agren J., Reudink R., Eckl M., van Westrum D., Billson R. and Ellis B. (2015): CCM.G-K2 key comparison, Metrologia Vol. 52 (1A), pp. 07009
DOI: 10.1088/0026-1394/52/1A/07009

Schilling M. and Gitlein O. (2015): Accuracy Estimation of the IfE Gravimeters Micro-g LaCoste gPhone-98 and ZLS Burris Gravity Meter B-64, Proceedings of the IAG Scientific Assembly,01.-06.09.2013, Potsdam; International Association of Geodesy Symposia Vol. 143, pp. 249-256, Springer Berlin Heidelberg
DOI: 10.1007/1345_2015_29


Non Peer-Reviewed Literature

Schilling M. and Gitlein O. (2015): Schwereregistrierungen mit dem Micro-g LaCoste gPhone-98 und dem ZLS Burris Gravity Meter B-64, Allgemeine Vermessungs-Nachrichten Vol. 122 (05), S. 176-183


Presentations, Talks and Posters

Devaraju B. and Müller J.  (2016): Quantifying tidal aliasing errors in the localized analysis of satellite tracking data, Geophysical Research Abstracts, EGU2016-4916 more

Leßmann L., Gitlein O. and Müller J. (2015): Gravity effects from non-tidal water mass changes in the Baltic Sea, 26th IUGG General Assembly, Prague, Czech Republic, 22 June – 02 July, 2015