DOI: 10.5194/hess-21-5089-2017
Scopus记录号: 2-s2.0-85026654371
论文题名: Using isotopes to constrain water flux and age estimates in snow-influenced catchments using the STARR (Spatially distributed Tracer-Aided Rainfall-Runoff) model
作者: Ala-Aho P ; , Tetzlaff D ; , McNamara J ; P ; , Laudon H ; , Soulsby C
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 10 起始页码: 5089
结束页码: 5110
语种: 英语
Scopus关键词: Catchments
; Digital storage
; Isotopes
; Rain
; Snow
; Snow melting systems
; Spatial distribution
; Sublimation
; Travel time
; Experimental catchments
; Fractionation process
; Isotopic fractionations
; Landscape characteristic
; Modelling framework
; Runoff generation process
; Soil characteristics
; Stable water isotopes
; Runoff
; age determination
; catchment
; flux measurement
; glacial hydrology
; isotopic analysis
; isotopic fractionation
; mixing
; rainfall-runoff modeling
; runoff
; snow
; snowmelt
; snowpack
; stream
; sublimation
; tracer
; travel time
英文摘要: Tracer-aided hydrological models are increasingly used to reveal fundamentals of runoff generation processes and water travel times in catchments. Modelling studies integrating stable water isotopes as tracers are mostly based in temperate and warm climates, leaving catchments with strong snow influences underrepresented in the literature. Such catchments are challenging, as the isotopic tracer signals in water entering the catchments as snowmelt are typically distorted from incoming precipitation due to fractionation processes in seasonal snowpack. We used the Spatially distributed Tracer-Aided Rainfall-Runoff (STARR) model to simulate fluxes, storage, and mixing of water and tracers, as well as estimating water ages in three long-term experimental catchments with varying degrees of snow influence and contrasting landscape characteristics. In the context of northern catchments the sites have exceptionally long and rich data sets of hydrometric data and - most importantly - stable water isotopes for both rain and snow conditions. To adapt the STARR model for sites with strong snow influence, we used a novel parsimonious calculation scheme that takes into account the isotopic fractionation through snow sublimation and snowmelt. The modified STARR setup simulated the streamflows, isotope ratios, and snow pack dynamics quite well in all three catchments. From this, our simulations indicated contrasting median water ages and water age distributions between catchments brought about mainly by differences in topography and soil characteristics. However, the variable degree of snow influence in catchments also had a major influence on the stream hydrograph, storage dynamics, and water age distributions, which was captured by the model. Our study suggested that snow sublimation fractionation processes can be important to include in tracer-aided modelling for catchments with seasonal snowpack, while the influence of fractionation during snowmelt could not be unequivocally shown. Our work showed the utility of isotopes to provide a proof of concept for our modelling framework in snow-influenced catchments. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79031
Appears in Collections: 气候变化事实与影响
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作者单位: Northern Rivers Institute, School of Geosciences, University of Aberdeen, United Kingdom; Department of Geosciences, Boise State University, Boise, ID, United States; Department of Forest, Ecology and Management, Swedish University of Agricultural Sciences, Umeä, Sweden
Recommended Citation:
Ala-Aho P,, Tetzlaff D,, McNamara J,et al. Using isotopes to constrain water flux and age estimates in snow-influenced catchments using the STARR (Spatially distributed Tracer-Aided Rainfall-Runoff) model[J]. Hydrology and Earth System Sciences,2017-01-01,21(10)