On the analysis of temporal geoid height variations obtained from GRACE-based GGMs over the area of Poland

Walyeldeen Godah,Malgorzata Szelachowska,Jan Krynski

doi:10.1007/s11600-017-0064-3

Walyeldeen Godah, Malgorzata Szelachowska + Show 1 more

Open Access

https://doi.org/10.1007/s11600-017-0064-3

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Journal: Acta Geophysica	Publication Date: Jul 21, 2017
Citations: 15	License type: open-access

Affiliation: Institute of Geodesy and Cartography

Abstract

Temporal mass variations in the Earth system, which can be detected from the Gravity Recovery and Climate Experiment (GRACE) mission data, cause temporal variations of geoid heights. The main objective of this contribution is to analyze temporal variations of geoid heights over the area of Poland using global geopotential models (GGMs) developed on the basis of GRACE mission data. Time series of geoid height variations were calculated for the chosen subareas of the aforementioned area using those GGMs. Thereafter, these variations were analyzed using two different methods. On the basis of the analysis results, models of temporal geoid height variations were developed and discussed. The possibility of prediction of geoid height variations using GRACE mission data over the area of Poland was also investigated. The main findings reveal that the geoid height over the area of Poland vary within 1.1 cm which should be considered when defining the geoid model of 1 cm accuracy for this area.

Highlights

Knowledge of a precise geoid represented by the equipotential surface at the mean sea level of a hypothetical ocean at rest is one of the fundamental tasks of geodesy
Temporal mass variations in the Earth system, which can be detected from the Gravity Recovery and Climate Experiment (GRACE) mission data, cause temporal variations of geoid heights
The investigation of temporal variations of geoid heights, obtained from GFZ release 05 (RL05) GRACE-based global geopotential models (GGMs) filtered using DDK3 filter and truncated at d/o 60, over the area of Poland divided into four 3° 9 5° subareas reveals that in the absolute sense, differences between geoid height variations from epoch to epoch can reach 10 mm

Summary

Introduction

Knowledge of a precise geoid represented by the equipotential surface at the mean sea level of a hypothetical ocean at rest is one of the fundamental tasks of geodesy. The modelling of regional geoid/quasi-geoid with sub-centimetre accuracy is considered as one of the activities of the Commission 2—Gravity Field of the International Association of Geodesy (IAG). The Joint Study Group 0.15 (JSG 0.15) concerning the regional geoid/quasi-geoid modelling—Theoretical framework for the sub-centimetre accuracy at the Intercommission Committee on Theory (ICCT) has been established for the period from 2015 to 2019 (see Drewes et al 2016).

Objectives

Conclusion