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DOI	10.1016/j.jhydrol.2019.124339
	Assessing land water storage dynamics over South America
	Ndehedehe, Christopher E.1,2; Ferreira, Vagner G.3
通讯作者	Ndehedehe, Christopher E.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	580
英文摘要	The underlying uncertainties in the prediction of freshwater evolutions in some regions can be induced by several unmitigated human actions, multi-scale climatic drivers, and dynamic physical processes. These factors have enduring hydro-ecological effects on the environments and combine to limit our understanding of large scale hydrological processes and impacts of climate on water availability. Considering the fact that several hydrogeological perturbations and disturbances have been reported during the last decade in South America (SA), a further assessment of continental land water storage is therefore warranted. In this study, a two-step regularization approach that combined the JADE (Joint Approximate Diagonalisation of Eigen matrices) algorithm and PLSR (partial least squares regression) was employed to assess GRACE (Gravity Recovery and Climate Experiment)-terrestrial water storage (TWS) over SA. Based on the Bartlett's statistics, significant independent patterns of SST (Sea Surface Temperature) anomalies from the Pacific and Atlantic oceans were used in the PLSR scheme to model the temporal evolutions of TWS (2002 - 2017) over twelve prominent river basins in SA. From the JADE rotation of TWS over SA, strong inter-annual changes in TWS observed over the Amazon basin and within its floodplain corridors were identified. The unabated mass loss in Patagonia ice-field caused by warming of the climate and other GRACE-hydrological signals were also retrieved from the JADE scheme. The rainfall TWS relationship is considerably strong (r = 0.80 at 0 - 2 months lag) in much of tropical SA, including the Amazon basin and highlights the influence of climate variability in the region. Medium (r = 0.40) and moderately strong (r = 0.60) rainfall-TWS relationship were also found to be significant (a = 0.05) but with up to 4 months lag and more in some basins. During the 2010 - 2017 period, estimated TWS trends (a = 0.05) showed a considerable fall in Orinoco (- 38.48 +/- 7.90 mm/yr) and Sao Francisco (- 30.84 +/- 4.17) while the strongest rise was found in Uruguay (28.28 +/- 3.49 mm/yr). As the rainfall-TWS relationship is not statistically significant (a = 0.05) in some areas, the spatial distribution of trends in TWS and rainfall, especially in some arid regions, which are inconsistent confirm possible impacts resulting from complex hydrogeological processes and/or anthropogenic influence. Further, in the modelling of TWS time series using the JADE-PLSR scheme, several validation skill metrics (e.g., R-2 , Nash-Sutcliffe Efficiency) confirm the considerable agreements between predicted and observed TWS in the Amazon (R-2 = 0.95), Orinoco (R-2 = 0.94), Tocantins (R-2 = 0.91), and Chobut (R-2 = 0.88). However, GRACE-hydrological signals in some regions are somewhat complex given the relatively higher uncertainties in the multivariate models employed in this study.
英文关键词	Rainfall Sea surface temperature Amazon basin Partial least square regression ENSO Climate variability
类型	Article
语种	英语
国家	Australia ; Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000509620900042
WOS关键词	WEST-AFRICA ; SPATIOTEMPORAL VARIABILITY ; CLIMATE EXPERIMENT ; GRAVITY RECOVERY ; PLS-REGRESSION ; RIVER-BASIN ; GRACE ; DROUGHT ; RAINFALL ; TRENDS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	河海大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314981
作者单位	1.Griffith Univ, Australian Rivers Inst, Nathan, Qld 4111, Australia; 2.Griffith Univ, Griffith Sch Environm & Sci, Nathan, Qld 4111, Australia; 3.Hohai Univ, Sch Earth Sci & Engn, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Ndehedehe, Christopher E.,Ferreira, Vagner G.. Assessing land water storage dynamics over South America[J]. 河海大学,2020,580.
APA	Ndehedehe, Christopher E.,&Ferreira, Vagner G..(2020).Assessing land water storage dynamics over South America.JOURNAL OF HYDROLOGY,580.
MLA	Ndehedehe, Christopher E.,et al."Assessing land water storage dynamics over South America".JOURNAL OF HYDROLOGY 580(2020).