Assessment of terrestrial water contributions to polar motion from GRACE and hydrological models

Jin, Shuanggen; Hassan, A. A.; Feng, Gao

doi:10.1016/j.jog.2012.01.009

Cited by 62 publications

(35 citation statements)

References 24 publications

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“…We have shown that the use of the new FGOALS-g2 climate model does not improve significantly the agreement with geodetic residuals GAO. Whereas we confirm other studies (Seoane et al, 2009(Seoane et al, , 2011Nastula et al, 2011Nastula et al, , 2012Jin et al, 2010Jin et al, , 2012 we also indicate in details the contribution of individual variables of this climate model. It was shown that the HAM changes obtained from FGOALS-g2 climate model do not show linear trend from 2003, expect χ 2 TWS1 HAM excitation, which the linear trend almost fits that of geodetic residuals GAO and GRACE data.…”

Section: Discussionsupporting

confidence: 92%

“…In recent years many studies on the impact of land hydrology on the polar motion excitation give inconsistent results (Chen and Wilson, 2005;Seoane et al, 2011;Nastula et al, 2011;Jin et al, 2012) with very different amplitudes and phases for polar motion excitation at seasonal scales Chen and Wilson, 2005). Indeed, these models do not represent completely hydrological variations (Chen and Wilson, 2005) because Terrestrial Water Storage (TWS) was not adequately measured at the continental scale (Lettenmaier et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…In papers by (Jin et al, 2010(Jin et al, , 2012Nastula et al, 2011), the global hydrological and gravimetric excitation functions of polar motion were compared with the residual series GAO=GAM −AAM −OAM as computed by removing atmospheric (AAM) and oceanic (OAM) contributions from the Geodetic Angular Momentum GAM series . In this study the GAM were derived from the pole coordinates time series C04 provided by International Earth Rotation and Reference System Service (IERS) .…”

Section: Introductionmentioning

confidence: 99%

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Hydrological Excitations of Polar Motion Derived from Different Variables of Fgoals − g2 Climate Model

Wińska

2016

Artificial Satellites

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The hydrological contribution to decadal, inter-annual and multi-annual suppress polar motion derived from climate model as well as from GRACE (Gravity Recovery and Climate Experiment) data is discussed here for the period 2002.3-2016.0. The data set used here are Earth Orientation Parameters Combined 04 (EOP C04), Flexible Global Ocean-Atmosphere-Land System Model: Grid-point Version 2 (FGOAL-g2) and Global Land Data Assimilation System (GLDAS) climate models and GRACE CSR RL05 data for polar motion, hydrological and gravimetric excitation, respectively. Several Hydrological Angular Momentum (HAM) functions are calculated here from the selected variables: precipitation, evaporation, runoff, soil moisture, accumulated snow of the FGOALS and GLDAS climate models as well as from the global mass change fields from GRACE data provided by the International Earth Rotation and Reference System Service (IERS) Global Geophysical Fluids Center (GGFC). The contribution of different HAM excitation functions to achieve the full agreement between geodetic observations and geophysical excitation functions of polar motion is studied here.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrological Excitations of Polar Motion Derived from Different Variables of Fgoals − g2 Climate Model

Wińska

2016

Artificial Satellites

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“…Many studies on the impact of land hydrology on the polar motion excitation have been carried out in recent years Seoane et al 2011;Nastula et al 2011;Jin et al 2012;Adhikari and Ivins 2016). However, the global land hydrology models used in such studies each tend to provide significantly different amplitudes and phases for polar motion excitation .…”

Section: Introductionmentioning

confidence: 99%

Hydrological excitation of polar motion by different variables from the GLDAS models

Wińska

Nastula

Salstein

2017

J Geod

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Continental hydrological loading by land water, snow and ice is a process that is important for the full understanding of the excitation of polar motion. In this study, we compute different estimations of hydrological excitation functions of polar motion (as hydrological angular momentum, HAM) using various variables from the Global Land Data Assimilation System (GLDAS) models of the land-based hydrosphere. The main aim of this study is to show the influence of variables from different hydrological processes including evapotranspiration, runoff, snowmelt and soil moisture, on polar motion excitations at annual and short-term timescales. Hydrological excitation functions of polar motion are determined using selected variables of these GLDAS realizations. Furthermore, we use timevariable gravity field solutions from the Gravity Recovery and Climate Experiment (GRACE) to determine the hydrological mass effects on polar motion excitation. We first conduct an intercomparison of the maps of variations of regional hydrological excitation functions, timing and phase diagrams of different regional and global HAMs. Next, we estimate the hydrological signal in geodetically observed polar motion excitation as a residual by subtracting the contributions of atmospheric angular momentum and oceanic angular momentum. Finally, the hydrological excitations are compared with those hydrological signals determined from residuals of the observed polar motion excitation series. The results will help us understand the relative importance of polar motion excitation within the individual hydrological processes, based on hydrological modeling. This method will allow us to estimate how well the polar motion excitation budget in the seasonal and inter-annual spectral ranges can be closed.

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“…The impact of continental hydrologic signals from land, water, snow and ice on polar motion excitation (Hydrological Angular Momentum; HAM), is still inadequately estimated and not as well-known as atmospheric and oceanic impacts (Chen and Wilson, 2005), (Seoane et al, 2011), ), (Jin et al, 2012, (Wińska et al, 2016). A comparison of HAM with hydrological signals in observed geodetic excitation functions is a common method of assessing the influence of land hydrology on the polar motion excitation function.…”

Section: Seasonal Hydrological Signals In Polar Motion Excitationmentioning

confidence: 99%

Geodynamic Research at the Department of Planetary Geodesy, SRC PAS

Brzeziński

Jóźwik

Kaczorowski

et al. 2016

Reports on Geodesy and Geoinformatics

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Assessment of terrestrial water contributions to polar motion from GRACE and hydrological models

Cited by 62 publications

References 24 publications

Hydrological Excitations of Polar Motion Derived from Different Variables of Fgoals − g2 Climate Model

Hydrological Excitations of Polar Motion Derived from Different Variables of Fgoals − g2 Climate Model

Hydrological excitation of polar motion by different variables from the GLDAS models

Geodynamic Research at the Department of Planetary Geodesy, SRC PAS

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