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Time variations of the gravity ﬁeld over Europe obtained from GRACE data

Kloch-Glowka G., Krynski J., Szelachowska M.

Reports on Geodesy

2012

z. 1/92

175--190

Time variations of the gravity field derived from time series of geopotential model developed from GRACE data can be interpreted in terms of geoid heights, and mass time variations with unprecedented temporal resolution. Following the results of authors previous research presented at 2nd General Assembly of the IGFS, 20-22 September 2010, Fairbanks, Alaska, the series of monthly solutions of geopotential models developed from GRACE data in JPL, filtered with the use of DKK1 filter, and GLDAS hydrological model were used in the analyses. Variations of hydrology as well as variations of geoid heights for the period August 2002 – June 2010 at the continental part of Europe and selected 14 subareas were estimated with spatial resolution of 0.5° x 0.5° . Variations in mass distribution obtained from geopotential models were compared with the respective results obtained from hydrological data. Models of geoid height changes (parameters of trend and seasonal variations) were determined for the area of Europe and for 14 subareas. To verify models of geoid height changes, over the period July 2010 - October 2010 values of geoid height changes calculated using GRACE data were compared with values based on the models developed.

Application of the global geopotential models for determination of the levelling normal correction

Marganski S., Kalinczuk-Stanałowska K., Olszak T.

Reports on Geodesy

2010

z. 1/88

115-120

Vertical networks in Poland are processed in the normal heights system called Kronstatt'86. Levelling evaluation of high precision measurements requires a determinations of normal levelling corrections, based on gravity Faye's anomalies. The purposes of the paper is to analyze the possibility of using in this computations the anomalies generated from global geopotential models while maintaining accuracy analysis which indicate a possible accuracy of Faye's anomalies. Author have compared gravity anomalies obtained directly from measurements with gravity anomalies generated from different global geopotential models EGM96, PGM96, EGM2008. Authors have prospered an algorithm of gravity anomalies computation on geoid surface after free-air moving anomalies from geopotential models. Comparison was made on points of vertical network located in medium-hill areas (around Starachowice near Kielce) and lowland (around Gostyn and Grudziadz) and on others test fields in Poland. The ability to use the geopotential models depends on their resultation. As a result of analysis concluded that only in the plain and lowland areas is possible to use data from global geopotential models with resolution above degree 720.