36 Result(s)
within
C. K. Shum
Earth Sciences
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Article
On the harmonic correction in the gravity field determination
The “non-harmonicity” problem in residual terrain modelling (RTM) is a challenging issue, causing errors exceeding 200 mGal in the RTM gravity anomaly in rugged areas. Although various methods have been propos...
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Article
Interannual variability of vertical land motion over High Mountain Central Asia from GPS and GRACE/GRACE-FO observations
Vertical land motion (VLM) involves complex nonlinear geophysical signals, including periodic oscillations and long-term trend. Analyzing the spatial variation characteristics of VLM at different timescales is...
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Article
Open AccessA triaxial reference ellipsoid for the Earth
We present a new, physically motivated triaxial reference ellipsoid for the Earth. It is an equipotential surface in the gravity field and closely approximates the geoid, akin to the conventional reference ell...
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Article
Altimeter-derived marine gravity variations reveal the magma mass motions within the subaqueous Nishinoshima volcano, Izu–Bonin Arc, Japan
Variations of marine gravity reflect mass changes in Earth’s interior, including magma motions during volcanic eruption, which manifest in submarine mass transports. Absolute gravimeters have been used to dete...
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Article
Quality assessment of global gravity field models in coastal zones: A case study using astrogeodetic vertical deflections in Istanbul, Turkey
We present the first high-precision astrogeodetic vertical deflection (VD) observations collected in Istanbul, Turkey, using a novel lightweight total station integrated with a charge-coupled device (CCD) came...
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Article
Satellite altimetry for measuring river stages in remote regions
The advent in satellite altimetry with the most accurate satellite radar altimeter since 1992 and its successive missions have enabled the routine global monitoring of water-level (or stage) for surface waters...
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Article
Open AccessDevelo** a Complex Independent Component Analysis (CICA) Technique to Extract Non-stationary Patterns from Geophysical Time Series
In recent decades, decomposition techniques have enabled increasingly more applications for dimension reduction, as well as extraction of additional information from geophysical time series. Traditionally, the...
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Chapter
Gravity Changes over Russian River Basins from GRACE
Gravity Recovery and Climate Experiment (GRACE) twin satellites have been observing the mass transports of the Earth inferred by the monthly gravity field solutions in terms of spherical harmonic coefficients ...
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Article
Multivariate Prediction of Total Water Storage Changes Over West Africa from Multi-Satellite Data
West African countries have been exposed to changes in rainfall patterns over the last decades, including a significant negative trend. This causes adverse effects on water resources of the region, for instanc...
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Article
Erratum to: Assessing consistency of Chang’E-1 and SELENE reference frames using nearly-colocated laser altimetry footprint positions
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Article
Assessing consistency of Chang’E-1 and SELENE reference frames using nearly-colocated laser altimetry footprint positions
The consistency of the Chang’E-1 and SELENE reference frames as realized by the footprint positions of laser altimetry measurements of the lunar surface during both missions was analyzed using a global 12-para...
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Article
Effects of Gaussian filter in processing GRACE data: Gravity rate of change at Lhasa, southern Tibet
In this paper, the spatial gravity distribution over Tibetan Plateau and the gravity rate of change at Lhasa for different Gaussian filter radii are computed using GRACE data. Results show that the estimate of...
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Article
Open AccessAccuracy assessment of lunar topography models
Both the Chang’E-1 and SELenological and ENgineering Explorer (SELENE) lunar missions, launched in 2007, provide an opportunity for significant advances in lunar science. In particular, both orbiters provide refi...
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Chapter and Conference Paper
Baltic Sea Mass Variations from GRACE: Comparison with In Situ and Modelled Sea Level Heights
The monthly variation in the water mass of the semi-enclosed Baltic Sea is about 60 Gt RMS over an area of \(390,000 \textrm{km}^2\) ...
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Article
On the postprocessing removal of correlated errors in GRACE temporal gravity field solutions
We revisit the empirical moving window filtering method of Swenson and Wahr (Geophys Res Lett 33:L08402, 2006) and its variants, Chambers (Geophys Res Lett 33:L17603, 2006) and Chen et al. (Geophys Res Lett 34...
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Article
Triangulated spherical splines for geopotential reconstruction
We present an alternate mathematical technique than contemporary spherical harmonics to approximate the geopotential based on triangulated spherical spline functions, which are smooth piecewise spherical harmo...
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Article
Open AccessPreface
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Article
Open AccessSouthern Ocean mass variation studies using GRACE and satellite altimetry
The Southern Ocean is a major link between the world oceans via complicated processes associated with the melting and accumulation of the vast Antarctic ice sheets and the surrounding sea ice. The Southern Oce...
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Article
Open AccessCall for Papers: Special Issue of Earth, Planets and Space (EPS)
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Article
On the double-peak spectrum of the Chandler wobble
It is well known that two close spectral peaks with comparable amplitudes exist in the Chandler wobble (CW) band in the observed polar motion spectrum during the first half of the last century. However, it is ...
