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Determining Regional-Scale Groundwater Recharge with GRACE and GLDAS

Qifan Wu, Bingcheng Si, Hailong He, Pute Wu
2019 Remote Sensing  
Here, we estimate GR using Gravity Recovery and Climate Experiment (GRACE) and Global Land Data Assimilation System (GLDAS) data.  ...  The regional-scale GR rate is calculated based on the groundwater storage fluctuation, which is, in turn, calculated from the difference between GRACE and root zone soil water storage from GLDAS data.  ...  GRACE-measurable storage increases.  ... 
doi:10.3390/rs11020154 fatcat:4wki6ivtlvdmzovhkvufcr6gbe

Variations in China's terrestrial water storage over the past decade using GRACE data

Qian Zhao, Weiwei Wu, Yunlong Wu
2015 Geodesy and Geodynamics  
All GRACE monthly gravity field data were extended to the 60th degree/order.  ...  Furthermore, on the basis of the monthly GRACE gravity field, Leblanc [8, 9] .  ... 
doi:10.1016/j.geog.2015.03.004 fatcat:7kxqqymdanamhatx2evkpj7pqq

GRACETOOLS—GRACE Gravity Field Recovery Tools

Neda Darbeheshti, Florian Wöske, Matthias Weigelt, Christopher Mccullough, Hu Wu
2018 Geosciences  
Our aim is to initiate an open source GRACE data analysis platform, where the existing algorithms and codes for working with GRACE data are shared and improved.  ...  At the end, we demonstrate how GRACETOOLS works with simulated GRACE type observations.  ...  Abbreviations The following abbreviations are used in this manuscript: ASD Amplitude Spectral Density GRACE Gravity Recovery and Climate Experiment GRACETOOLS GRACE gravity field recovery tools GNV1B  ... 
doi:10.3390/geosciences8090350 fatcat:5zvsaixy5ngutosoly3vwnlzqq

Effectiveness of empirical orthogonal function used in decorrelation of GRACE time-variable gravity field

Qian Zhao, Yunlong Wu, Weiwei Wu
2015 Geodesy and Geodynamics  
Gravity recovery and climate experiment (GRACE) gravity field Decorrelation Terrestrial water storage Global Land Data Assimilation System (GLDAS) a b s t r a c t Empirical orthogonal function (EOF) was  ...  used to process the spherical harmonic coefficient (SHC) of 115 Gravity Recovery and Climate Experiment (GRACE) RL05 monthly gravity field models from March 2003 to February 2013 released by CSR (Center  ...  Data and realization of EOF GRACE data Along with the prolonged mission time of GRACE, the gravity field models released by CSR are under continuous updating and thus the results become more reliable  ... 
doi:10.1016/j.geog.2015.05.003 fatcat:bu2zcmo3z5fn7hm6wjx2frn62e

Characterizing the Seasonal Crustal Motion in Tianshan Area Using GPS, GRACE and Surface Loading Models

Yunlong Wu, Qian Zhao, Bao Zhang, Weiwei Wu
2017 Remote Sensing  
We attribute this discrepancy to groundwater variations, which are not resolvable by GRACE and SLMs for small-scale regions. and Climate Experiment (GRACE) and surface loading models (SLMs) [7] [8] [9]  ...  The crustal vertical deformation obtained by GRACE can be used to exclude the non-tectonic impact caused by land water storage in the GPS results.  ...  GRACE.  ... 
doi:10.3390/rs9121303 fatcat:zy57ivdesrf5xkwiygbukmseu4

Evaluation of GRACE/GRACE Follow-On Time-Variable Gravity Field Models for Earthquake Detection above Mw8.0s in Spectral Domain

Ming Xu, Xiaoyun Wan, Runjing Chen, Yunlong Wu, Wenbing Wang
2021 Remote Sensing  
This study compares the Gravity Recovery And Climate Experiment (GRACE)/GRACE Follow-On (GFO) errors with the coseismic gravity variations generated by earthquakes above Mw8.0s that occurred during April  ...  The results show that the precision of GFO monthly models is approximately 38% higher than that of the GRACE monthly model and all the detected earthquakes have signal-to-noise ratio (SNR) larger than  ...  Acknowledgments: We would like to thank CSR for providing the GRACE data.  ... 
doi:10.3390/rs13163075 fatcat:crlh6cvdljhxpk7cbiiwgiqgou

Graceful Degradation in TSS-BQS Systems

Wen-Tao WANG, Jing-Qiang LIN, Ji-Wu JING, Bo LUO
2012 Chinese Journal of Computers  
doi:10.3724/sp.j.1016.2012.01793 fatcat:frik4wv7jnew7nxpv6ytqq5xra

Dynamical Synapses Enhance Neural Information Processing: Gracefulness, Accuracy, and Mobility

C. C. Alan Fung, K. Y. Michael Wong, He Wang, Si Wu
2012 Neural Computation  
Experimental data have revealed that neuronal connection efficacy exhibits two forms of short-term plasticity, namely, short-term depression (STD) and short-term facilitation (STF). They have time constants residing between fast neural signaling and rapid learning, and may serve as substrates for neural systems manipulating temporal information on relevant time scales. The present study investigates the impact of STD and STF on the dynamics of continuous attractor neural networks (CANNs) and
more » ... ir potential roles in neural information processing. We find that STD endows the network with slow-decaying plateau behaviors-the network that is initially being stimulated to an active state decays to a silent state very slowly on the time scale of STD rather than on the time scale of neural signaling. This provides a mechanism for neural systems to hold sensory memory easily and shut off persistent activities gracefully. With STF, we find that the network can hold a memory trace of external inputs in the facilitated neuronal interactions, which provides a way to stabilize the network response to noisy inputs, leading to improved accuracy in population decoding. Furthermore, we find that STD increases the mobility of the network states. The increased mobility enhances the tracking performance of the network in response to time-varying stimuli, leading to anticipative neural responses. In general, we find that STD and STP tend to have opposite effects on network dynamics and complementary computational advantages, suggesting that the brain may employ a strategy of weighting them differentially depending on the computational purpose.
doi:10.1162/neco_a_00269 pmid:22295986 fatcat:juupicupbbexdkh34hlpi6fj2e

Construction of Earth's gravitational field model from CHAMP, GRACE and GOCE data

Xiaogang Liu, Xiaoping Wu
2015 Geodesy and Geodynamics  
and CHAMP þ GRACE þ GOCE are derived.  ...  A syncretic model constructed from CHAMP, GRACE and GOCE data, which is expressed by champ þ grace þ goce, is obtained based on spectral combination method.  ...  2 À s 2 n Á GRACE þ À s 2 n Á GRACE À s 2 n Á GOCE þ À s 2 n Á GRACE !  ... 
doi:10.1016/j.geog.2015.06.001 fatcat:32d7f27435bfhb5gslcxcwgily

Gravity Variation in Siberia: GRACE Observation and Possible Causes

Benjamin Fong Chao, Yun Hao Wu, ZiZhan Zhang, Rokyo Ogawa
2011 Terrestrial, Atmospheric and Oceanic Sciences  
We report the finding, from the GRACE observation, of an increasing trend in the gravity anomaly in Siberia at the rate of up to 0.5 μgal yr -1 during 2003/1 -2009/12, in the backdrop of a negative anomaly  ...  Wu, and D. Garcia for inspiring discussions, and S. Tatavian and D. San'kov for providing Siberia geodetic measurements.  ...  The standard GRACE data are released in the form of spherical harmonic coefficients typically up to degree n = 120 at monthly intervals (Tapley et al. 2004 ; see grace/documentation.html  ... 
doi:10.3319/tao.2010.07.26.03(tibxs) fatcat:ekfrwc5hrjgirnqrrsnjicegoe

GRACE Data-based High Accuracy Global Static Earth's Gravity Field Model

CHEN Qiujie, SHEN Yunzhong, ZHANG Xingfu, CHEN Wu, XU Houze
2016 Acta Geodaetica et Cartographica Sinica  
The results demonstrate that the Tongji-Dyn01s has the same accuracy level with those of the latest GRACE-only models, while the Tongji-Dyn01k model is closer to the EIGEN6C2 than the other GRACE-only  ...  To recover the highly accurate static earth's gravity field by using GRACE satellite data is one of the hot topics in geodesy.  ...  Wu h a n : Wu h a nUn i v e r s i t y r a v i t yF i e l dR e c o v e r yf r om CHAMP O r b i t a n d A c c e l e r om e t e r D a t a [ D ] .Z h e n g z h o u : T h e P LA I n f o r m a t i o nE n g  ... 
doi:10.11947/j.agcs.2016.20150422 doaj:236fc73ab1f44c799b73de21337c5fe3 fatcat:gcu5iwazand2naozt32jq6p54a


Xufeng S. Wu, Grace L. Tsan, John A. Hammer
2006 Journal of Cell Biology  
doi:10.1083/jcb.20050302820060126c pmcid:PMC2063681 fatcat:43edhfyrmbeyxp2ckfpq4e3ugm

Temporal Evolution of Regional Drought Detected from GRACE TWSA and CCI SM in Yunnan Province, China

Siyu Ma, Qianxin Wu, Jie Wang, Shiqiang Zhang
2017 Remote Sensing  
In this study, the direction, magnitude, start time, and duration of droughts were investigated, based on Total Water Storage Anomalies (TWSA) of Gravity Recovery and Climate Experiment (GRACE), Climate  ...  GRACE observations and CCI SM can be used as important indicators of the spatial distribution of the drought process and its impact on the environment and local communities, which will improve the management  ...  Deriving month-to-month gravity field variations from GRACE observations requires a complex inversion of the changing observations between the two formation-flying GRACE spacecrafts, combined with precise  ... 
doi:10.3390/rs9111124 fatcat:mthrka7zlffxznjwtz7zdagj3e

Application of Accelerometer Data in Precise Orbit Determination of GRACE -A and -B

Dong-Ju Peng, Bin Wu
2008 Chinese Journal of Astronomy and Astrophysics  
We investigate how well the GRACE satellite orbits can be determined using the onboard GPS data combined with the accelerometer data.  ...  The relative accuracy between the two GRACE satellites is validated by the KBR data to be on a level of 1.29 cm for the SD, and 1.03 cm for the ZD solution.  ...  Acknowledgements The authors extend special thanks to the information system and data center (ISDC) of GeoForschungesZentrum (GFZ), for providing the GPS satellites orbit and GRACE Level 1B data.  ... 
doi:10.1088/1009-9271/8/5/11 fatcat:houour5sf5fnlgupo3hzqtwcta

Phase Error Modeling and Its Impact on Precise Orbit Determination of GRACE Satellites

Jia Tu, Defeng Gu, Yi Wu, Dongyun Yi, Jiasong Wang
2012 Mathematical Problems in Engineering  
are 0.0068 m and 0.0075 m for GRACE A and GRACE B, respectively.  ...  The three-dimensional (3D) orbit improvements derived from phase error model correction are 0.0153 m for GRACE A and 0.0131 m for GRACE B, and the 3D influences arisen from random part of phase error model  ...  Acknowledgments The authors are grateful to GeoForschungsZentrum GFZ for providing GPS observation data, attitude data, KBR data, and precise science orbit data of GRACE mission.  ... 
doi:10.1155/2012/710586 fatcat:cfqa6i6vyje7zbeql5iblg2wzu
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