干旱区生态环境知识资源中心(Arid): Assessing the sensitivity of modelled water partitioning to global precipitation datasets in a data-scarce dryland region

Arid

DOI	10.1002/hyp.15047
	Assessing the sensitivity of modelled water partitioning to global precipitation datasets in a data-scarce dryland region
	Quichimbo, E. A.; Singer, M. B.; Michaelides, K.; Rosolem, R.; Macleod, D. A.; Asfaw, D. T.; Cuthbert, M. O.
通讯作者	Quichimbo, EA
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2023
卷号	37 期号:12
英文摘要	Precipitation is the primary driver of hydrological models, and its spatial and temporal variability have a great impact on water partitioning. However, in data-sparse regions, uncertainty in precipitation estimates is high and the sensitivity of water partitioning to this uncertainty is unknown. This is a particular challenge in drylands (semi-arid and arid regions) where the water balance is highly sensitive to rainfall, yet there is commonly a lack of in situ rain gauge data. To understand the impact of precipitation uncertainty on the water balance in drylands, here we have performed simulations with a process-based hydrological model developed to characterize the water balance in arid and semi-arid regions (DRYP: DRYland water Partitioning model). We performed a series of numerical analyses in the Upper Ewaso Ng'iro basin, Kenya driven by three gridded precipitation datasets with different spatio-temporal resolutions (IMERG, MSWEP, and ERA5), evaluating simulations against streamflow observations and remotely sensed data products of soil moisture, actual evapotranspiration, and total water storage. We found that despite the great differences in the spatial distribution of rainfall across a climatic gradient within the basin, DRYP shows good performance for representing streamflow (KGE >0.6), soil moisture, actual evapotranspiration, and total water storage (r >0.5). However, the choice of precipitation datasets greatly influences surface (infiltration, runoff, and transmission losses) and subsurface fluxes (groundwater recharge and discharge) across different climatic zones of the Ewaso Ng'iro basin. Within humid areas, evapotranspiration does not show sensitivity to the choice of precipitation dataset, however, in dry lowland areas it becomes more sensitive to precipitation rates as water-limited conditions develop. The analysis shows that the highest rates of precipitation produce high rates of diffuse recharge in Ewaso uplands and also propagate into runoff, transmission losses and, ultimately focused recharge, with the latter acting as the main mechanism of groundwater recharge in low dry areas. The results from this modelling exercise suggest that care must be taken in selecting forcing precipitation data to drive hydrological modelling efforts, especially in basins that span a climatic gradient. These results also suggest that more effort is required to reduce uncertainty between different precipitation datasets, which will in turn result in more consistent quantification of the water balance.
英文关键词	dryland ephemeral streams groundwater recharge transmission losses water partitioning
类型	Article
语种	英语
开放获取类型	Green Accepted, hybrid
收录类别	SCI-E
WOS记录号	WOS:001133402300001
WOS关键词	NGIRO RIVER-BASIN ; POTENTIAL EVAPOTRANSPIRATION ; HYDROLOGICAL IMPACTS ; RAINFALL PRODUCTS ; RESOLUTION ; CLIMATE ; SCALE ; GROUNDWATER ; PATTERNS ; MODIS
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396879
推荐引用方式 GB/T 7714	Quichimbo, E. A.,Singer, M. B.,Michaelides, K.,et al. Assessing the sensitivity of modelled water partitioning to global precipitation datasets in a data-scarce dryland region[J],2023,37(12).
APA	Quichimbo, E. A..,Singer, M. B..,Michaelides, K..,Rosolem, R..,Macleod, D. A..,...&Cuthbert, M. O..(2023).Assessing the sensitivity of modelled water partitioning to global precipitation datasets in a data-scarce dryland region.HYDROLOGICAL PROCESSES,37(12).
MLA	Quichimbo, E. A.,et al."Assessing the sensitivity of modelled water partitioning to global precipitation datasets in a data-scarce dryland region".HYDROLOGICAL PROCESSES 37.12(2023).