Spaceborne Gravity Sensors for Continental Hydrology and Geodynamic Studies
- Resource Type
- Article
- Authors
- C. K. Shum; Shin Chan Han; Alexander Braun
- Source
- 대한원격탐사학회지 / Korean Journal of Remote Sensing. Feb 01, 2005 21(1):51
- Subject
- Gravity
Temporal Gravity
Hydrology
Geodynamics
Plate Convergence
Earthquakes
Glacial Isostatic Adjustment
- Language
- Korean
English
- ISSN
- 1225-6161
The currently operating NASA/GFZ Gravity Recovery and Climate Experiment (GRACE) mission is designed to measure small mass changes over a large spatial scale, including the mapping of continental water storage changes and other geophysical signals in the form of monthly temporal gravity field. The European Space Agency`s Gravity field and steady state Ocean Circulation Explorer (GOCE) space gravity gradiometer (SGG) mission is anticipated to determine the mean Earth gravity field with an unprecedented geoid accuracy of several cm (rms) with wavelength of 130 km or longer. In this paper, we present a summary of present GRACE studies for the recovery of hydrological signals in the Amazon basin using alternative processing and filtering techniques, and local inversion to enhance the temporal and spatial resolutions by two-folds or better. Simulation studies for the potential GRACE detection of slow deformations due to Nazca-South America plate convergence and glacial isostatic adjustment (GIA) signals show that these signals are at present difficult to detect without long-term data averaging and further improvement of GRACE measurement accuracy.