干旱区生态环境知识资源中心(Arid): Assessing the Steady-State Assumption in Water Balance Calculation Across Global Catchments

Arid

DOI	10.1029/2020WR027392
	Assessing the Steady-State Assumption in Water Balance Calculation Across Global Catchments
	Han, Juntai; Yang, Yuting; Roderick, Michael L.; McVicar, Tim R.; Yang, Dawen; Zhang, Shulei; Beck, Hylke E.
通讯作者	Yang, YT
来源期刊	WATER RESOURCES RESEARCH
ISSN	0043-1397
EISSN	1944-7973
出版年	2020
卷号	56 期号:7
英文摘要	It has long been assumed that over a sufficiently long period of time, changes in catchment water storage (Delta S) are a relatively minor term compared to other fluxes and can be neglected in the catchment water balance equation. However, the validity of this fundamental assumption has rarely been tested, and the associated uncertainties in water balance calculations remain unknown. Here, we use long-term (1982-2011) observations of monthly streamflow (Q) and precipitation (P) for 1,057 global unimpaired catchments, combined with four independent evapotranspiration (E) estimates to infer Delta S and to provide a global assessment of the steady-state assumption in catchment water balance calculations. Results show that when the threshold for steady state is set to 5% of the mean monthly P, similar to 70% of the catchments attain steady state within 10 years while similar to 6% of the catchments fail to reach a steady state even after 30 years. The time needed for a catchment to reach steady state (tau(s)) shows a close relationship with climatic aridity and vegetation coverage, with arid/semiarid and sparsely vegetated catchments generally having a longer tau(s). Additionally, increasing snowfall fraction also increases tau(s). The imbalance (e(wb)) caused by ignoring Delta Sdecreases as averaging period for water balance calculations increases as expected. For a typical 10-year averaging period,e(wb)accounts for similar to 7% of P in arid, but that decreases to similar to 3% ofPin humid catchments. These results suggest that catchment properties should be considered when applying the steady-state assumption and call for caution when ignoring Delta Sin arid/semiarid regions.
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000556141400001
WOS关键词	INTERANNUAL VARIABILITY ; VEGETATION CONTROL ; CLIMATE ; EVAPOTRANSPIRATION ; PRECIPITATION ; LAND ; SOIL ; EVAPORATION ; FRAMEWORK ; STREAMFLOW
WOS类目	Environmental Sciences ; Limnology ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
来源机构	北京师范大学 ; 清华大学 ; Commonwealth Scientific and Industrial Research Organisation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325441
作者单位	[Han, Juntai; Yang, Yuting; Yang, Dawen] Tsinghua Univ, Dept Hydraul Engn, State Key Lab Ilydrosci & Engn, Beijing, Peoples R China; [Roderick, Michael L.] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia; [Roderick, Michael L.; McVicar, Tim R.] Australian Res Council Ctr Excellence Climate Ext, Canberra, ACT, Australia; [McVicar, Tim R.] CSIRO Land & Water, Canberra, ACT, Australia; [Zhang, Shulei] Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; [Beck, Hylke E.] Princeton Univ, Dept Civil & Environm Engn, Princeton, NJ 08544 USA
推荐引用方式 GB/T 7714	Han, Juntai,Yang, Yuting,Roderick, Michael L.,et al. Assessing the Steady-State Assumption in Water Balance Calculation Across Global Catchments[J]. 北京师范大学, 清华大学, Commonwealth Scientific and Industrial Research Organisation,2020,56(7).
APA	Han, Juntai.,Yang, Yuting.,Roderick, Michael L..,McVicar, Tim R..,Yang, Dawen.,...&Beck, Hylke E..(2020).Assessing the Steady-State Assumption in Water Balance Calculation Across Global Catchments.WATER RESOURCES RESEARCH,56(7).
MLA	Han, Juntai,et al."Assessing the Steady-State Assumption in Water Balance Calculation Across Global Catchments".WATER RESOURCES RESEARCH 56.7(2020).