Significance of secular trends of mass variations determined from GRACE solutions

International audience Since 2002 the Earth's gravity field is globally observed by the Gravity Recovery and Climate Experiment (GRACE) satellite mission. The GRACE monthly gravity field solutions, available from several analysis centres, reflect mass variations in the atmosphere, hydrosphere a...

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Bibliographic Details
Published in:Journal of Geodynamics
Main Authors: Steffen, Holger, Petrovic, Svetozar, Müller, Jürgen, Schmidt, Roland, Wünsch, Johann, Barthelmes, Franz, Kusche, Jürgen
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2009
Subjects:
GRACE
filtering
mass variation
glacial isostatic adjustment
global hydrology models
Fennoscandia
Online Access:https://hal.archives-ouvertes.fr/hal-00594417
https://hal.archives-ouvertes.fr/hal-00594417/document
https://hal.archives-ouvertes.fr/hal-00594417/file/PEER_stage2_10.1016%252Fj.jog.2009.09.029.pdf
https://doi.org/10.1016/j.jog.2009.09.029
Description
Summary:International audience Since 2002 the Earth's gravity field is globally observed by the Gravity Recovery and Climate Experiment (GRACE) satellite mission. The GRACE monthly gravity field solutions, available from several analysis centres, reflect mass variations in the atmosphere, hydrosphere and geosphere. Due to correlated noise contained in these solutions, it is, however, first necessary to apply an appropriate filtering technique. The resulting, smoothed time series are applied not only to determine variations with different periodic signatures (e.g., seasonal, short and medium-term), but to derive long-periodic mass variations and secular trends as well. As the GRACEmonthly solutions always show the integral effect of all mass variations, for separation of single processes, like the GIA (Glacial isostatic adjustment)- related mass increase in Fennoscandia, appropriate reduction models (e.g. from hydrology) are necessary.

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