globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12465
论文题名:
Controls on water balance of shallow thermokarst lakes and their relations with catchment characteristics: A multi-year, landscape-scale assessment based on water isotope tracers and remote sensing in Old Crow Flats, Yukon (Canada)
作者: Turner K.W.; Wolfe B.B.; Edwards T.W.D.; Lantz T.C.; Hall R.I.; Larocque G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期:5
起始页码: 1585
结束页码: 1603
语种: 英语
英文关键词: Climate change ; Hydrology ; Isotope tracers ; Land cover ; Old Crow Flats ; Remote sensing ; Spatial analysis ; Thermokarst lakes
Scopus关键词: catchment ; climate change ; hydrological response ; lake level ; lake water ; land cover ; remote sensing ; spatial analysis ; thermokarst ; tracer ; water budget ; Canada ; Old Crow Flats ; Yukon Territory
英文摘要: Many northern lake-rich regions are undergoing pronounced hydrological change, yet inadequate knowledge of the drivers of these landscape-scale responses hampers our ability to predict future conditions. We address this challenge in the thermokarst landscape of Old Crow Flats (OCF) using a combination of remote sensing imagery and monitoring of stable isotope compositions of lake waters over three thaw seasons (2007-2009). Quantitative analysis confirmed that the hydrological behavior of lakes is strongly influenced by catchment vegetation and physiography. Catchments of snowmelt-dominated lakes, typically located in southern peripheral areas of OCF, encompass high proportions of woodland/forest and tall shrub vegetation (mean percent land cover = ca. 60%). These land cover types effectively capture snow and generate abundant snowmelt runoff that offsets lake water evaporation. Rainfall-dominated lakes that are not strongly influenced by evaporation are typically located in eastern and northern OCF where their catchments have higher proportions of dwarf shrub/herbaceous and sparse vegetation (ca. 45%), as well as surface water (ca. 20%). Evaporation-dominated lakes, are located in the OCF interior where their catchments are distinguished by substantially higher lake area to catchment area ratios (LA/CA = ca. 29%) compared to low evaporation-influenced rainfall-dominated (ca. 10%) and snowmelt-dominated (ca. 4%) lakes. Lakes whose catchments contain >75% combined dwarf shrub/herbaceous vegetation and surface water are most susceptible to evaporative lake-level drawdown, especially following periods of low precipitation. Findings indicate that multiple hydrological trajectories are probable in response to climate-driven changes in precipitation amount and seasonality, vegetation composition, and thermokarst processes. These will likely include a shift to greater snowmelt influence in catchments experiencing expansion of tall shrubs, greater influence from evaporation in catchments having higher proportions of surface water, and an increase in the rate of thermokarst lake expansion and probability of drainage. Local observations suggest that some of these changes are already underway. © 2013 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62055
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geography and Environmental Studies, Wilfrid Laurier University, Waterloo, ON, N2L 3C5, Canada; Department of Geography, Brock University, St. Catharines, ON, L2S 3A1, Canada; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, N2L 3G1, Canada; School of Environmental Studies, University of Victoria, Victoria, BC, V8P 5C2, Canada; Department of Biology, University of Waterloo, Waterloo, ON, N2L 3G1, Canada; Quebec Centre for Biodiversity Science, Biology Department, McGill University, Montreal, QC H3A 1B1, Canada

Recommended Citation:
Turner K.W.,Wolfe B.B.,Edwards T.W.D.,et al. Controls on water balance of shallow thermokarst lakes and their relations with catchment characteristics: A multi-year, landscape-scale assessment based on water isotope tracers and remote sensing in Old Crow Flats, Yukon (Canada)[J]. Global Change Biology,2014-01-01,20(5)
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