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Acta Geodynamica et Geomaterialia

Authors: Kiss Annamária and Földváry Lóránt
DOI: 10.13168/AGG.2018.0011
Journal: Acta Geodynamica et Geomaterialia, Vol. 15, No. 2 (190), Prague 2018
Full Text: PDF file (0.9 MB)
Keywords: GRACE; multi-annual mass variations; hydrology; gravity
Abstract: The GRACE satellites have provided gravity field solutions with approximately monthly resolution since April 2002. The monthly solutions enable investigations of the annual, semi-annual and secular mass variations, which mainly occur in a thin layer of the Earth’s surface. By the end of the GRACE science mission in 2017, the time span has increased to 15 years, making the possibility of determining longer-period variations feasible. First attempts to determine multi-annual variations, i.e. periods of some years but less than 10, are presented in this study. A combination of 3 different PSD estimation methods has been used for identifying the regions of multi-annual mass variations. As a result, 8 different areas have been found with significant multi-annual mass variations. The source of multi-annual mass variations in most detected regions can be identified as related to the ENSO cycle.