Abstract
Time-varying gravity field solutions from the Gravity Recovery and Climate Experiment (GRACE) satellite mission have been used to investigate the inter-annual changes of hydrologic water storage (∆ S) within Asia, focusing on the India–China–South Asia region. Instead of computing GRACE monthly ∆ S from geopotential coefficients, we choose to compute the annually averaged ∆ S before data smoothing, which improved the accuracy for the resulting inter-annual water storage changes. We then applied a novel method of decorrelation, filtering and land signal leakage reduction to the data, which yielded more accurate and higher spatial resolution (200 km or longer, half-wavelength) GRACE storage change observables over the study region. The technique provides a tool for future more in-depth studies of terrestrial hydrology in this region or globally. GRACE inter-annual variations in water storage change (2002–2007) exhibit large extremes over the region: droughts in Eastern China in 2004 and Indo-China and Bangladesh in 2005; and flooding in Indo-China and India in 2006. In general, GRACE inter-annual ∆ S variations have significantly larger amplitudes (increase or decrease of water storage change) than the values predicted by the Global Land Data Assimilation System (GLDAS) hydrologic model, and than the total precipitation observed by the Topical Rainfall Measurement Mission (TRMM).
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- NASA:
-
National Aeronautics and Space Administration
- DLR:
-
Deutsches Zentrum für Luft- und Raumfahrt joint satellite mission
- GRACE:
-
Gravity Recovery and Climate Experiment
- TRMM:
-
Topical Rainfall Measurement Mission
- KBR:
-
K/Ka-band low-low inter-satellite ranging
- ENSO:
-
El Niño-Southern Oscillation
- GLDAS:
-
Global Land Data Assimilation System
- GIA:
-
glacial isostatic adjustment
- EOF:
-
empirical orthogonal functions
- SCs:
-
Stokes coefficients
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Acknowledgments
We used the monthly GLDAS data provided by the IERS Global Geophysical Fluids Center’s Special Bureau for Hydrology hosted by University of Texas at Austin Center for Space Research (UT/CSR). The GRACE data products are from the NASA/DLR GRACE project and we used the data products from UT/CSR. The TRMM data product is provided by NASA/GSFC. We thank Lóránt Földváry for his help in generating a figure in the paper and for valuable discussions. This research is supported by grants from NSF (EAR-0440007), from NASA (NG04GN19G), from National Geospatial-Intelligence Agency’s University Research Initiative (NURI) Program, and from the Ohio State University’s Climate, Water and Carbon Program.
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Shum, C.K. et al. (2010). Inter-annual Water Storage Changes in Asia from GRACE Data. In: Lal, R., Sivakumar, M., Faiz, S., Mustafizur Rahman, A., Islam, K. (eds) Climate Change and Food Security in South Asia. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9516-9_6
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