Hydrological signals in polar motion excitation - Evidence after fifteen years of the GRACE mission

Jolanta Nastula , Małgorzata Wińska , Justyna Śliwińska , D. Salstein

Abstract

We investigate the contribution of continental hydrology signals to polar motion excitation resulting from changes in mass distribution associated with terrestrial water and snow/ice based on a variety of datasets. The impact of the former is less well known than that of other geophysical fluids, namely atmospheric and oceanic angular momentum signals, especially for oscillations over shorter-than-annual periods. The geodetic excitation function of polar motion can be determined from observations, while the hydrological excitation function can be estimated either from global models of the land-based hydrosphere or from indirect observations of variations in the Earth’s gravity field. With more than 15 years of data, the pair of GRACE satellites has provided valid datasets for studying interannual polar motion excitation. Recent results are promising and indicate agreement between GRACE-derived interannual hydrological excitations and the corresponding geodetic observations. Our work focuses on the non-seasonal spectral range, and compares hydrological excitations based on recent GRACE solutions from different centres with signals from climate models, and as a residual from geodetic observations.
Author Jolanta Nastula
Jolanta Nastula,,
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, Małgorzata Wińska (FCE / IRB)
Małgorzata Wińska,,
- The Institute of Roads and Bridges
, Justyna Śliwińska
Justyna Śliwińska,,
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, D. Salstein
D. Salstein,,
-
Journal seriesJournal of Geodynamics, ISSN 0264-3707, (N/A 100 pkt)
Issue year2019
Vol124
Pages119-132
Publication size in sheets0.65
Keywords in PolishGLDAS; CMIP5, hydrologia
Keywords in EnglishGRACE; Hydrological polar motion excitation; GLDAS; CMIP5
ASJC Classification1904 Earth-Surface Processes; 1908 Geophysics
DOIDOI:10.1016/j.jog.2019.01.014
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 20-10-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.042; WoS Impact Factor: 2017 = 2.142 (2) - 2017=2.418 (5)
Citation count*1 (2019-10-03)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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