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1

Assessment of the Global and Regional Land Hydrosphere and Its Impact on the Balance of the Geophysical Excitation Function of Polar Motion

Wińska M., Nastula J., Kołaczek B.

Acta Geophysica

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2016

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Vol. 64, no. 1

270--292

EN

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.

2

Comparison of the geophysical excitations of polar motion from the period: 1980.0-2009.0

Nastula J., Paśnicka M., Kołaczek B.

Acta Geophysica

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2011

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Vol. 59, no. 3

561-577

EN

In this study we compared contributions to polar motion excitation determined separately from each of three kinds of geophysical data: atmospheric pressure, equivalent water height estimated from hydrological models, and harmonic coefficients of the Earth gravity field obtained from Gravity Recovery and Climate Experiment (GRACE). Hydrological excitation function (Hydrological Angular Momentum - HAM) has been estimated from models of global hydrology, based on the observed distribution of surface water, snow, ice, and soil moisture. In our consideration we used several global models of land hydrosphere and models of Atmospheric Angular Momentum (AAM) and Oceanic Angular Momentum (OAM). All of them were compared with observed Geodetic Angular Momentum (GAM). The spectra of the following excitation functions of polar motion: GAM, AAM+OAM, AAM+OAM+HAM, GAM-AAM-OAM residual geodetic excitation function, and HAM were computed too. The time variable spectra of geodetic, gravimetric, and the sum of atmospheric, oceanic, and hydrological excitation functions are also presented. Phasor diagrams of the seasonal components of polar motion excitation functions of all HAM excitation functions as well as of two GRACE solutions: Center for Space Research (CSR), Centre National d'Etudes Spatiales/Groupe de Recherche en Geodesie Spatiale (CNES/GRGS) were determined and discussed.

3

Fifty years of observation activities at Astro-Geodetic Observatory in Józefosław

Rogowski J. B., Kołaczek B.

Reports on Geodesy

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2008

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z. 2/85

151-166

4

Professor Aleksander Brzeziński - a winner of the prestigious 2003 EU Descartes Prize

Kołaczek B.

Geodezja i Kartografia

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2004

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T. 53, z. 2

79-83

EN

Prof. Aleksander Brzeziński, Ph.D of the Planetary Geodesy Department of the Space Research Center of the Polish Akademy of sciences, was awarded the Descartes Prize as a member of the team of 25 researchers from 9 countries, headed by professor Veronique Dehant from the royal observatory of Belgium for completing the research on "Non-rigid Earth nutation model". In the note some information about two 2003 EU Descartes Prizes is given. The 1980 IAU model of nutation worked out by J. Wahr is mentioned and the most important achievements of the Working group on "Non-Rigid Earth nutation model", with the emphasis on A. Brzeziński contribution, are presented.

PL

Prof. dr hab. Aleksander Brzeziński został nagrodzony w 2003 r. Europejską Nagrodą Kartezjusza w zespole 25 naukowców z 9 krajów, kierowanym przez prof. Veronique Dehant z królewskiego Obserwatorium Belgijskiego, za pracę pt. "Model nutacji dla niesztywnej Ziemi". W notatce podane są informacje o dwóch Europejskich Nagrodach Kartezjusza przyznanych w 2003 r. W notatce wspomniano o teorii nutacji opracowanej przez Wahr'a w 1980 r. i ważniejszych wynikach wyznaczeń nutacji Ziemi niesztywnej i sztywnej uzyskanych w zespole prof. Veronique Dehant z podkreśleniem prac wykonanych przez prof. Brzezińskiego.

5

Geodynamic investigations on the threshold of XXI century

Kołaczek B., Barlik M.

Geodezja i Kartografia

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1998

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T. 47, z. 1-2

41-57