DOI: 10.5194/hess-23-1667-2019
论文题名: Impact of glacier loss and vegetation succession on annual basin runoff
作者: Carnahan E. ; Amundson J.M. ; Hood E.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 3 起始页码: 1667
结束页码: 1681
语种: 英语
Scopus关键词: Climate change
; Climate models
; Vegetation
; Climate forcings
; Climate regime
; Glacier dynamics
; Glacier retreat
; Landscape model
; Orographic precipitation
; Out of equilibrium
; Vegetation successions
; Runoff
; climate forcing
; evapotranspiration
; glacier
; glacier dynamics
; glacier retreat
; precipitation (climatology)
; runoff
; vegetation type
英文摘要: We use a simplified glacier-landscape model to investigate the degree to which basin topography, climate regime, and vegetation succession impact centennial variations in basin runoff during glacier retreat. In all simulations, annual basin runoff initially increases as water is released from glacier storage but ultimately decreases to below preretreat levels due to increases in evapotranspiration and decreases in orographic precipitation. We characterize the long-term ( > 200 years) annual basin runoff curves with four metrics: The magnitude and timing of peak basin runoff, the time to preretreat basin runoff, and the magnitude of end basin runoff. We find that basin slope and climate regime have strong impacts on the magnitude and timing of peak basin runoff. Shallow sloping basins exhibit a later and larger peak basin runoff than steep basins and, similarly, continental glaciers produce later and larger peak basin runoff compared to maritime glaciers. Vegetation succession following glacier loss has little impact on the peak basin runoff but becomes increasingly important as time progresses, with more rapid and extensive vegetation leading to shorter times to preretreat basin runoff and lower levels of end basin runoff.We suggest that differences in the magnitude and timing of peak basin runoff in our simulations can largely be attributed to glacier dynamics: Glaciers with long response times (i.e., those that respond slowly to climate change) are pushed farther out of equilibrium for a given climate forcing and produce larger variations in basin runoff than glaciers with short response times. Overall, our results demonstrate that glacier dynamics and vegetation succession should receive roughly equal attention when assessing the impacts of glacier mass loss on water resources. © 2019 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163008
Appears in Collections: 气候变化与战略
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作者单位: Carnahan, E., Department of Natural Sciences, University of Alaska Southeast, Juneau, AK 99801, United States, Institute for Geophysics, University of Texas at Austin, Austin, TX 78758, United States; Amundson, J.M., Department of Natural Sciences, University of Alaska Southeast, Juneau, AK 99801, United States; Hood, E., Department of Natural Sciences, University of Alaska Southeast, Juneau, AK 99801, United States
Recommended Citation:
Carnahan E.,Amundson J.M.,Hood E.. Impact of glacier loss and vegetation succession on annual basin runoff[J]. Hydrology and Earth System Sciences,2019-01-01,23(3)