ICEAGE - Modelling Snow-ice Cover Evolution and Associated Gravitational Effects with GOCE Constraints
This investigation of SIR was performed using terrestrial, space- borne interferometric, altimetric, and gravity field data. Special emphasis was given to estimate the impact and scientific contribution of ESA’s satellite gravity gradiometry mission GOCE to regional inland cryospheric studies.
By comparing consecutive geometrical models, changes in the cryosphere and its masses are detectable. These variations in ice masses can also be seen in changes of the Earth’s gravity field. Thus, a detailed knowledge of the gravity field can deliver valuable information of temporal mass variations in the cryosphere.
In consequence, the Institute of Navigation and Satellite Geodesy, TU Graz, and the Institute of Digital Image Processing, Remote Sensing Group, JOANNEUM RESEARCH Forschungs- gesellschaft mbH, investigated cryospheric changes within the non-homogenous gravity field.
To obtain the most accurate regional gravity field information, gravity gradients observed by GOCE were used as input data for a least squares collocation process, resulting in gravity anomalies and geoid heights for the test region. These computations were compared to local results of numerical forward modelling, based on a digital terrain model enhanced by vertical density distribution simulations.
As study areas several large European ice caps situated around the Barents Sea, namely the main ice sheet in north Novaya Zemlya, ice domes in north-eastern Svalbard, and ice caps in the central part of Franz Josef Land have been selected.
In the light of climate research the investigation of the cryosphere contributes to a better understanding and forecasting of recent and potential changes of the largest European glaciers, while the improved knowledge of the geoid provides a solid datum for glacier remote sensing and mapping in the study regions.
Graz University of Technology, Institute of Navigation and Satellite Geodesy - 2008 – 2009: Prof. Roland Pail, since 2010: Florian Heuberger
JOANNEUM RESEARCH Forschungsgesellschaft mbH, Institute of Digital Image Processing - Aleksey Sharov
Graz University of Technology - Institute of Navigation and Satellite Geodesy