气候变化领域集成服务门户(CCPortal): On the use of the GRACE normal equation of inter-satellite tracking data for estimation of soil moisture and groundwater in Australia

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DOI	10.5194/hess-22-1811-2018
	On the use of the GRACE normal equation of inter-satellite tracking data for estimation of soil moisture and groundwater in Australia
	Tangdamrongsub N.; Han S.-C.; Decker M.; Yeo I.-Y.; Kim H.
发表日期	2018
ISSN	1027-5606
起始页码	1811
结束页码	1829
卷号	22 期号:3
英文摘要	An accurate estimation of soil moisture and groundwater is essential for monitoring the availability of water supply in domestic and agricultural sectors. In order to improve the water storage estimates, previous studies assimilated terrestrial water storage variation (δTWS) derived from the Gravity Recovery and Climate Experiment (GRACE) into land surface models (LSMs). However, the GRACE-derived δTWS was generally computed from the high-level products (e.g. time-variable gravity fields, i.e. level 2, and land grid from the level 3 product). The gridded data products are subjected to several drawbacks such as signal attenuation and/or distortion caused by a posteriori filters and a lack of error covariance information. The post-processing of GRACE data might lead to the undesired alteration of the signal and its statistical property. This study uses the GRACE least-squares normal equation data to exploit the GRACE information rigorously and negate these limitations. Our approach combines GRACE's least-squares normal equation (obtained from ITSG-Grace2016 product) with the results from the Community Atmosphere Biosphere Land Exchange (CABLE) model to improve soil moisture and groundwater estimates. This study demonstrates, for the first time, an importance of using the GRACE raw data. The GRACE-combined (GC) approach is developed for optimal least-squares combination and the approach is applied to estimate the soil moisture and groundwater over 10 Australian river basins. The results are validated against the satellite soil moisture observation and the in situ groundwater data. Comparing to CABLE, we demonstrate the GC approach delivers evident improvement of water storage estimates, consistently from all basins, yielding better agreement on seasonal and inter-annual timescales. Significant improvement is found in groundwater storage while marginal improvement is observed in surface soil moisture estimates. © 2018 Author(s).
语种	英语
scopus关键词	Cables; Climate models; Data handling; Digital storage; Geodetic satellites; Groundwater; Moisture; Soil moisture; Soils; Tracking (position); Water conservation; Water supply; Error covariance information; Gravity recovery and climate experiments; Satellite soil moisture; Satellite tracking data; Statistical properties; Surface soil moisture; Terrestrial water storage; Time-variable gravity; Soil surveys; annual variation; equation; estimation method; GRACE; groundwater; least squares method; river basin; satellite altimetry; satellite data; seasonal variation; soil moisture; tracking; water storage; Australia
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160082
作者单位	Tangdamrongsub, N., School of Engineering, University of Newcastle, Callaghan, NSW, Australia; Han, S.-C., School of Engineering, University of Newcastle, Callaghan, NSW, Australia; Decker, M., ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW, Australia; Yeo, I.-Y., School of Engineering, University of Newcastle, Callaghan, NSW, Australia; Kim, H., Institute of Industrial Science, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Tangdamrongsub N.,Han S.-C.,Decker M.,et al. On the use of the GRACE normal equation of inter-satellite tracking data for estimation of soil moisture and groundwater in Australia[J],2018,22(3).
APA	Tangdamrongsub N.,Han S.-C.,Decker M.,Yeo I.-Y.,&Kim H..(2018).On the use of the GRACE normal equation of inter-satellite tracking data for estimation of soil moisture and groundwater in Australia.Hydrology and Earth System Sciences,22(3).
MLA	Tangdamrongsub N.,et al."On the use of the GRACE normal equation of inter-satellite tracking data for estimation of soil moisture and groundwater in Australia".Hydrology and Earth System Sciences 22.3(2018).