A5072117142- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Inertial Sensor and Navigation
- Geomagnetism and Paleomagnetism Studies
- Cryospheric studies and observations
- Remote Sensing and Land Use
- Environmental Changes in China
- Ionosphere and magnetosphere dynamics
- Planetary Science and Exploration
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Quantum chaos and dynamical systems
- Advanced Frequency and Time Standards
- Nonlinear Waves and Solitons
- Soil Moisture and Remote Sensing
- Geology and Paleoclimatology Research
- Satellite Image Processing and Photogrammetry
- Reservoir Engineering and Simulation Methods
- Higher Education and Teaching Methods
- Geological Modeling and Analysis
- Remote Sensing in Agriculture
- Statistical and numerical algorithms
- Plant Water Relations and Carbon Dynamics
- 3D Surveying and Cultural Heritage
- Seismic Imaging and Inversion Techniques
Northwest University
2024-2025
Jet Propulsion Laboratory
2010-2024
Huzhou University
2023-2024
Fuzhou University
2024
CHN Energy (China)
2021
China Shenhua Energy (China)
2021
University of Science and Technology of China
2021
Fujian Agriculture and Forestry University
2019
PLA Information Engineering University
2005-2015
California Institute of Technology
1999-2015
The stress tensor orientation was estimated based on inversion from 238 first motion fault plane solutions of earthquakes with mostly M = 3.5 ± 0.6 located in the 10‐km radius Kaoiki crustal volume. Separate inversions for subvolumes containing 20–50 events yielded same results several adjacent volumes, suggesting that is homogeneous those parts area and are stable meaningful. Five spatial subsets data were found which at least one principal axes different other sets by 20°–80° confidence...
The International Terrestrial Reference Frame (ITRF) is a fundamental datum for high?precision orbit tracking, navigation, and global change monitoring. Accurately realizing maintaining ITRF origin at the mean Earth system center of mass (CM) critical to surface spacecraft based geodetic measurements including those sea level rise its sources. Although combines data from satellite laser ranging (SLR), Very Long Baseline Interferometry (VLBI), Global Positioning System (GPS), Doppler...
Monthly global surface mass distribution changes are estimated in the spherical harmonic domain with a complete spectrum up to degree and order 50. The estimates derived by inverting GPS displacement series measured at roughly 450 continuously tracking sites ocean bottom pressure (OBP) of data assimilated circulation model from 1993 2004. inversion uses hybrid estimator after singular value decomposition normalized measurement equations reduced reliance on priori spectral information....
SLR network translations estimated between a quasi‐instantaneous station position set, theoretically expressed with respect to the center of mass Earth (CM), and secular reference frame are signature motion CM crust. Geocenter is defined here be geometric solid surface (CF). translational variations cannot rigorously interpreted as identical geocenter due sparse nonuniform distribution network. Their difference called effect, which should dominated at subdecadal timescales by loading...
Abstract Detailed maps of bed elevation and ice thickness are essential for understanding projecting the evolution sheets. Such traditionally obtained using airborne radar-sounding profiler data interpolated onto regular grids geostatistical tools such as kriging. Here we compare three mapping techniques applied to a dense radar survey Russell Glacier, West Greenland, by NASA Operation IceBridge: (1) tomography (RT) processing map elevation, (2) interpolation radar-derived ordinary kriging...
Abstract The Mercury Orbiter Radio Science Experiment (MORE) of the ESA mission BepiColombo will provide an accurate estimation Mercury’s gravity field and rotational state, improved tests general relativity, a novel deep space navigation system. key experimental setup entails highly stable, multi-frequency radio link in X Ka band, enabling two-way range rate measurements 3 micron/s at nearly all solar elongation angles. In addition, high chip rate, pseudo-noise ranging system has already...
Abstract Previous studies have primarily focused on the influence of temperature and precipitation phenology. It is unclear if easily ignored climate factors with drivers vegetation growth can effect In this research, we conducted an analysis start (SOS) end (EOS) growing seasons in northern region China above 30°N from 1982 to 2014, focusing two-season We examined response phenology different types preseason climatic factors, including relative humidity (RH), shortwave radiation (SR),...
ABSTRACT This paper is devoted to studying the exact controllability for Kawahara equation under influence of quasilinear perturbations sufficiently small data on circle with localized control, nonlinearities containing up five space derivatives and having a Hamiltonian structure at highest order. Firstly, we conjugate associated linearized operator time‐dependent variable coefficient bounded remainder. The major difficulties come from coupling order term coefficients other terms. strategy...
Detrended crustal deformation measurements from a global network of up to 200 continuous Global Positioning System (GPS) tracking sites are inverted for low degree and order ( n , m ≤ 6) spherical harmonic series surface mass variations. An independent geophysical model the atmosphere, oceans, water snow on land is also used guide truncation evaluate aliasing errors in results. Inversion uncertainties decrease significantly as spatial coverage data quality improve with time, especially last...
Abstract We present and discuss JTRF2014, the Terrestrial Reference Frame (TRF) Jet Propulsion Laboratory constructed by combining space‐geodetic inputs from very long baseline interferometry (VLBI), satellite laser ranging (SLR), Global Navigation Satellite Systems (GNSS), Doppler orbitography radiopositioning integrated submitted for realization of ITRF2014. Determined through a Kalman filter Rauch‐Tung‐Striebel smoother assimilating position observations, Earth orientation parameters,...
Abstract The current International Terrestrial Reference Frame is based on a piecewise linear site motion model and realized by reference epoch coordinates velocities for global set of stations. Although motions due to tectonic plates glacial isostatic adjustment dominate geodetic signals, at today's millimeter precisions, nonlinear earthquakes, volcanic activities, ice mass losses, sea level rise, hydrological changes, other processes become significant. Monitoring these (sometimes rapid)...
Abstract Geocentre motion between the centre-of-mass of Earth system and centre-of-figure solid surface is a critical signature degree-1 components global mass transport process that includes sea level rise, ice imbalance continental-scale hydrological change. To complement GRACE data for complete-spectrum monitoring, geocentre needs to be measured accurately. However, current methods geodetic translational approach inversions various combinations deformation, simulated ocean bottom pressure...
Soil moisture time series data are usually nonlinear in nature and influenced by multiple environmental factors. The traditional autoregressive integrated moving average (ARIMA) method has high prediction accuracy but is only suitable for linear problems predicts with a single column of series. gated recurrent unit neural network (GRU) can achieve the multivariate data, model does not yield optimal results. Therefore, hybrid model, BAG, combining characteristics soil moisture, proposed this...
Precise GPS measurements of elastic relative site displacements due to surface mass loading offer important constraints on global transport. We investigate effects distribution and aliasing by higher‐degree ( n ≥ 2) terms inversion data for = 1 load coefficients geocenter motion. Covariance simulation analyses are conducted assess the sensitivity mismodeling errors possible uncertainties in coefficient determination. found that use center‐of‐figure approximation inverse formulation could...
Abstract Long‐term monitoring of global mass transport within the Earth system improves our ability to mitigate natural hazards and better understand their relations climate change. Satellite gravity is widely used monitor surface variations for its unprecedented spatial temporal coverage. However, data contain signals from visco‐elastic deformation in response past ice sheet melting, preventing us extracting present‐day trend (PDMT) directly. Here we present a inversion scheme that...
Recent observations of Europa suggest that the Jovian satellite may have a liquid ocean underneath its icy surface. Geophysical models indicate tidal Love number k 2 has strong dependence on presence or absence an ocean. The ice shell thickness is also significant. Measurements static and gravity fields through their dynamic effects trajectory low Europan orbiter can be essential in detection inference other internal structures. Covariance analyses been carried out to assess accuracies using...
VLBI estimates for the retrograde annual nutation have shown that there is a 2 mas discrepancy with model results assume hydrostatically pre-stressed earth. This has been used to infer non-hydrostatic Y02 component of core-mantle-boundary (CMB) topography roughly 0.5 km in amplitude. However, possible effects other topographic components not fully examined.