Searched for: subject:"GRACE"
(1 - 20 of 49)

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Tangdamrongsub, Natthachet (author), Han, Shin Chan (author), Yeo, In Young (author), Dong, Jianzhi (author), Steele-Dunne, S.C. (author), Willgoose, Garry (author), Walker, Jeffrey P. (author)
Assimilating remote sensing observations into land surface models has become common practice to improve the accuracy of terrestrial water storage (TWS) estimates such as soil moisture and groundwater, for understanding the land surface interaction with the climate system, as well as assessing regional and global water resources. Such remote...
journal article 2020
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Xu, Z. (author)
In the 21st century, polar land ice melting became one of the driving factors of global sea level rise, which is discussed widely by the media and the public. Although the fact of the shrinking ice caps and accompanying changes in the sea level is established, the actual amount of polar ice melting still needs to be quantified in separate...
doctoral thesis 2019
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Wouters, B. (author), Gardner, Alex S. (author), Moholdt, Geir (author)
Glaciers outside of the ice sheets are known to be important contributors to sea level rise. In this work, we provide an overview of changes in the mass of the world's glaciers, excluding those in Greenland and Antarctica, between 2002 and 2016, based on satellite gravimetry observations of the Gravity Recovery and Climate Experiment (GRACE)....
journal article 2019
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Groh, Andreas (author), Horwath, Martin (author), Horvath, Alexander (author), Meister, Rakia (author), Wouters, B. (author), Ditmar, P.G. (author), Ran, J. (author), Klees, R. (author), Schrama, E.J.O. (author)
Satellite gravimetry data acquired by the Gravity Recovery and Climate Experiment (GRACE) allows to derive the temporal evolution in ice mass for both the Antarctic Ice Sheet (AIS) and the Greenland Ice Sheet (GIS). Various algorithms have been used in a wide range of studies to generate Gravimetric Mass Balance (GMB) products. Results from...
journal article 2019
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Sun, Y. (author), Riva, R.E.M. (author), Ditmar, P.G. (author), Rietbroek, Roelof (author)
We present a new approach to estimate time variations in J2. Those variations are represented as the sum of contributions from individual sources. This approach uses solely Gravity Recovery And Climate Experiment (GRACE) data and the geoid fingerprints of mass redistributions that take place both at the surface and in the interior of the solid...
journal article 2019
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Li, Bailing (author), Rodell, Matthew (author), Kumar, Sujay (author), Beaudoing, Hiroko Kato (author), Getirana, Augusto (author), Zaitchik, Benjamin F. (author), de Goncalves, Luis Gustavo (author), Cossetin, Camila (author), Steele-Dunne, S.C. (author)
The scarcity of groundwater storage change data at the global scale hinders our ability to monitor groundwater resources effectively. In this study, we assimilate a state-of-the-art terrestrial water storage product derived from Gravity Recovery and Climate Experiment (GRACE) satellite observations into NASA's Catchment land surface model ...
journal article 2019
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Ditmar, P.G. (author)
Time-varying Stokes coefficients estimated from GRACE satellite data are routinely converted into mass anomalies at the Earth’s surface with the expression proposed for that purpose by Wahr et al. (J Geophys Res 103(B12):30,205–30,229, 1998). However, the results obtained with it represent mass transport at the spherical surface of 6378 km...
journal article 2018
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Ditmar, P.G. (author), Tangdamrongsub, N. (author), Ran, J. (author), Klees, R. (author)
We propose a technique to regularize a GRACE-based mass-anomaly time-series in order to (i) quantify the Standard Deviation (SD) of random noise in the data, and (ii) reduce the level of that noise. The proposed regularization functional minimizes the Month-to-month Year-to-year Double Differences (MYDD) of mass anomalies. As such, it does...
journal article 2018
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Zhang, Hongyue (author), Sun, Y. (author)
Annual cycles in the geocenter motion time series are primarily driven by mass changes in the Earth’s hydrologic system, which includes land hydrology, atmosphere, and oceans. Seasonal variations of the geocenter motion have been reliably determined according to Sun et al. (J Geophys Res Solid Earth 121(11):8352–8370, 2016) by combining the...
journal article 2018
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Didova, O. (author), Gunter, B.C. (author), Riva, R.E.M. (author), Klees, R. (author)
To fully exploit data from the Gravity Recovery and Climate Experiment (GRACE), we separate geophysical signals observed by GRACE in Antarctica by deriving high-spatial resolution maps for present-day glacial isostatic adjustment (GIA) and ice-mass changes with the least possible noise level. For this, we simultaneously (i) improve the...
journal article 2018
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Didova, O. (author)
The main goal of this thesis involves the development of a refined methodology to<br/>separate the mass change signals associated with glacial isostatic adjustment (GIA)<br/>from those of surface ice/firn by exploiting the strengths of independent data sets,<br/>such as those from gravimetry, altimetry, climate data, and others. To achieve this,...
doctoral thesis 2017
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Sun, Y. (author)
Geocenter motion and changes in the Earth’s dynamic oblateness (J2) are of great importance in many applications. Among others, they are critical indicators of largescale mass redistributions, which is invaluable to understand ongoing global climate change. The revolutionary Gravity Recovery and Climate Experiment (GRACE) satellite mission...
doctoral thesis 2017
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Kleinherenbrink, M. (author), Riva, R.E.M. (author), Frederikse, T. (author), Merrifield, Mark (author), Wada, Yoshihide (author)
The mass and steric components of sea level changes have been separated in the Tropical Asian Seas (TAS) using a statistically optimal combination of Jason satellite altimetry, GRACE satellite gravimetry, and ocean reanalyses. Using observational uncertainties, statistically optimally weighted time series for both components have been...
journal article 2017
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Ran, J. (author)
The Greenland ice sheet (GrIS) is currently losing mass, as a result of complex mechanisms of ice-climate interaction that need to be understood for reliable projections of future sea level rise. The thesis focuses on the estimation of mass anomalies in Greenland using data from the GRACE satellite gravity mission. Monthly GRACE gravity field...
doctoral thesis 2017
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Hashemi Farahani, H. (author), Ditmar, P.G. (author), Miragaia Gomes Inacio, P. (author), Didova, O. (author), Gunter, B.C. (author), Klees, R. (author), Guo, X. (author), Guo, Jing (author), Sun, Y. (author), Liu, Xianglin (author), Zhao, Qile (author), Riva, R.E.M. (author)
We present a high resolution model of the linear trend in the Earth’s mass variations based on DMT-2 (Delft Mass Transport model, release 2). DMT-2 was produced primarily from K-Band Ranging (KBR) data of the Gravity Recovery And Climate Experiment (GRACE). It comprises a time series of monthly solutions complete to spherical harmonic degree 120...
journal article 2017
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Simon, K.M. (author), Riva, R.E.M. (author), Kleinherenbrink, M. (author), Tangdamrongsub, N. (author)
Geodetic measurements of vertical land motion and gravity change are incorporated into an a priori model of present-day glacial isostatic adjustment (GIA) in North America via least-squares adjustment. The result is an updated GIA model wherein the final predicted signal is informed by both observational data, and prior knowledge (or...
journal article 2017
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Ran, J. (author), Ditmar, P.G. (author), Klees, R. (author), Farahani, H. (author)
We present an improved mascon approach to transform monthly spherical harmonic solutions based on GRACE satellite data into mass anomaly estimates in Greenland. The GRACE-based spherical harmonic coefficients are used to synthesize gravity anomalies at satellite altitude, which are then inverted into mass anomalies per mascon. The limited...
journal article 2017
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de Teixeira da Encarnacao, J.G. (author), Arnold, Daniel (author), Bezděk, Aleš (author), Dahle, Christoph (author), Doornbos, E.N. (author), van den IJssel, J.A.A. (author), Jäggi, Adrian (author), Mayer-Gürr, Torsten (author), Sebera, Josef (author), Visser, P.N.A.M. (author), Zehentner, Norbert (author)
It is of great interest to numerous geophysical studies that the time series of global gravity field models derived from Gravity Recovery and Climate Experiment (GRACE) data remains uninterrupted after the end of this mission. With this in mind, some institutes have been spending efforts to estimate gravity field models from alternative...
journal article 2016
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Tangdamrongsub, N. (author), Ditmar, P.G. (author), Steele-Dunne, S.C. (author), Gunter, B.C. (author), Sutanudjaja, E. H. (author)
In this study, satellite observations including gravity (GRACE), terrestrial reflectance (MODIS), and global precipitation (TRMM) data, along with the output from the PCR-GLOBWB hydrological model, are used to generate monthly and sub-monthly terrestrial water storage (TWS) estimates and quantify flood events over the Tonlé Sap basin between...
journal article 2016
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Fuchs, Martin Johann (author), Hooper, Andrew (author), Broerse, D.B.T. (author), Bouman, Johannes (author)
The Gravity Recovery and Climate Experiment (GRACE) mission (launched 2002) and the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) mission (March 2009 to November 2013) collected spaceborne gravity data for the preseismic and postseismic periods of the 2011 Tohoku-Oki earthquake. In addition, the dense Japan GeoNet Global...
journal article 2016
Searched for: subject:"GRACE"
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