气候变化领域集成服务门户(CCPortal): Multi-year isoscapes of lake water balances across a dynamic northern freshwater delta

CCPortal

DOI	10.1088/1748-9326/abb267
	Multi-year isoscapes of lake water balances across a dynamic northern freshwater delta
	Remmer C.R.; Neary L.K.; Kay M.L.; Wolfe B.B.; Hall R.I.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Sustainable approaches capable of tracking status, trends and drivers of lake water balances in complex, remote landscapes are needed to inform ecosystem stewardship and water-security actions. At the Peace-Athabasca Delta (Alberta, Canada), a globally recognized freshwater floodplain landscape, concerns about water-level drawdown and multiple potential stressors have prompted need to improve knowledge of lake water balances and establish a lake monitoring program. Yet, the delta’s remoteness and dynamic nature present challenges to these goals. Here we use over 1000 measurements of water isotope composition at ∼60 lakes and 9 river sites during the spring, summer and fall of five consecutive years (2015–2019) to elucidate patterns in lake water balance over time and space, the influential roles of evaporation and river floodwaters, and relations with meteorological conditions and river water levels. Calculation of evaporation-to-inflow ratios using a coupled-isotope tracer approach, displayed via generalized additive models and geospatial ‘isoscapes’, reveal strongly varying lake water balances. Results identify distinct areas vulnerable to lake-level drawdown, given the likelihood of continued decline in ice-jam flood frequency, longer ice-free season duration and reduced snowmelt runoff. Results also demarcate areas of the delta where lakes are more resilient to factors that cause drawdown. The former defines the Peace sector, which is influenced by floodwaters from the Peace River during episodic ice-jam flood events, whereas the latter describes portions of the active floodplain environment of the Athabasca sector which receives more frequent contributions of Athabasca River floodwaters during both spring ice-jam and open-water seasons. Efficiency of water isotope tracers to capture the marked temporal and spatial heterogeneity in lake water balances during this 5 year time span, and their diagnostic responses to key hydrological processes, serves as a foundation for ongoing lake monitoring, an approach readily transferable to other remote and dynamic lake-rich landscapes. © 2020 The Author(s).
英文关键词	Aquatic ecosystem monitoring; Freshwater landscapes; Isotope hydrology; Lake water balance; Long-term studies; Peace-Athabasca Delta
语种	英语
scopus关键词	Banks (bodies of water); Evaporation; Floods; Ice; Isotopes; Lakes; Rivers; Tracers; Generalized additive model; Hydrological process; Lake water balance; Meteorological condition; Monitoring programs; Peace-athabasca deltas; Temporal and spatial; Water level drawdown; Water levels; drawdown; evaporation; flood; floodplain; heterogeneity; snowmelt; tracer; tracking; water budget; Alberta; Athabasca River; Canada; Peace River; Peace-Athabasca Delta
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153629
作者单位	Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Department of Geography and Environmental Studies, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
推荐引用方式 GB/T 7714	Remmer C.R.,Neary L.K.,Kay M.L.,et al. Multi-year isoscapes of lake water balances across a dynamic northern freshwater delta[J],2020,15(10).
APA	Remmer C.R.,Neary L.K.,Kay M.L.,Wolfe B.B.,&Hall R.I..(2020).Multi-year isoscapes of lake water balances across a dynamic northern freshwater delta.Environmental Research Letters,15(10).
MLA	Remmer C.R.,et al."Multi-year isoscapes of lake water balances across a dynamic northern freshwater delta".Environmental Research Letters 15.10(2020).