DOI: 10.1002/2015GL064083
论文题名: Watershed geomorphology and snowmelt control stream thermal sensitivity to air temperature
作者: Lisi P.J. ; Schindler D.E. ; Cline T.J. ; Scheuerell M.D. ; Walsh P.B.
刊名: Geophysical Research Letters
ISSN: 0094-9270
EISSN: 1944-9001
出版年: 2015
卷: 42, 期: 9 起始页码: 3380
结束页码: 3388
语种: 英语
英文关键词: Bristol Bay, Alaska
; climate change
; hydrology
; MARSS
; thermal regime
Scopus关键词: Aquatic ecosystems
; Atmospheric temperature
; Hydrology
; Isotopes
; Open hearth furnaces
; Rain
; Sensitivity analysis
; Snow
; Snow melting systems
; Time series analysis
; Topography
; Watersheds
; Bristol Bay, Alaska
; Climatic conditions
; Hydrologic features
; MARSS
; Thermal heterogeneity
; Thermal regimes
; Thermal sensitivity
; Watershed topography
; Climate change
; air temperature
; geomorphology
; river basin
; seasonal variation
; snowmelt
; streamflow
; uncertainty analysis
; watershed
英文摘要: How local geomorphic and hydrologic features mediate the sensitivity of stream thermal regimes to variation in climatic conditions remains a critical uncertainty in understanding aquatic ecosystem responses to climate change. We used stable isotopes of hydrogen and oxygen to estimate contributions of snow and rainfall to 80 boreal streams and show that differences in snow contribution are controlled by watershed topography. Time series analysis of stream thermal regimes revealed that streams in rain-dominated, low-elevation watersheds were 5-8 times more sensitive to variation in summer air temperature compared to streams draining steeper topography whose flows were dominated by snowmelt. This effect was more pronounced across the landscape in early summer and less distinct in late summer. Thus, the impact of climate warming on freshwater thermal regimes will be spatially heterogeneous across river basins as controlled by geomorphic features. However, thermal heterogeneity may be lost with reduced snowpack and increased ratios of rain to snow in stream discharge. Key Points Topography controls hydrology and thereby mediates stream thermal regimes Snowmelt thermally buffers streams to air temperature in steeper watersheds Thermal heterogeneity across river basins could be lost with reduced snowpack ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930427580&doi=10.1002%2f2015GL064083&partnerID=40&md5=8a36dd247c7675febd29f54dac2c0966
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8886
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Lisi P.J.,Schindler D.E.,Cline T.J.,et al. Watershed geomorphology and snowmelt control stream thermal sensitivity to air temperature[J]. Geophysical Research Letters,2015-01-01,42(9).