Assessment of the global and regional land hydrosphere and its impact on the balance of the geophysical excitation function of polar motion

Małgorzata Wińska , Jolanta Nastula , Barbara Kołaczek

Abstract

The impact of continental hydrological loading from land water, snow and ice on polar motion excitation, calculated as hydrological angular momentum (HAM), is difficult to estimate, and not as much is known about it as about atmospheric angular momentum (AAM) and oceanic angular momentum (OAM). In this paper, regional hydrological excitations to polar motion are investigated using monthly terrestrial water storage data derived from the Gravity Recovery and Climate Experiment (GRACE) mission and from the five models of land hydrology. The results show that the areas where the variance shows large variability are similar for the different models of land hydrology and for the GRACE data. Areas which have a small amplitude on the maps make an important contribution to the global hydrological excitation function of polar motion. The comparison of geodetic residuals and global hydrological excitation functions of polar motion shows that none of the hydrological excitation has enough energy to significantly improve the agreement between the observed geodetic excitation and geophysical ones.
Author Małgorzata Wińska IDM
Małgorzata Wińska,,
- The Institute of Roads and Bridges
, Jolanta Nastula
Jolanta Nastula,,
-
, Barbara Kołaczek
Barbara Kołaczek,,
-
Journal seriesActa Geophysica, ISSN 1895-6572
Issue year2016
Vol64
No1
Pages270-292
Publication size in sheets1.1
Keywords in Englishpolar motion, land hydrosphere models, GRACE data
DOIDOI:10.1515/acgeo-2015-0041
Languageen angielski
File
zalacznik nr 2.pdf (file archived - login or check accessibility on faculty) zalacznik nr 2.pdf 1.2 MB
Score (nominal)20
ScoreMinisterial score = 20.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 20.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 0.968 (2) - 2016=1.27 (5)
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