DOI: 10.5194/hess-21-5427-2017
Scopus记录号: 2-s2.0-85032912327
论文题名: Forest impacts on snow accumulation and ablation across an elevation gradient in a temperate montane environment
作者: Roth T ; R ; , Nolin A ; W
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 11 起始页码: 5427
结束页码: 5442
语种: 英语
Scopus关键词: Ablation
; Snow
; Snow melting systems
; Water resources
; Wind
; Canopy interception
; Elevation gradient
; Forested environment
; Long-wave radiation
; Meteorological variables
; Model representation
; Snow water equivalent
; Turbulent energies
; Forestry
; ablation
; elevation
; energy balance
; forest canopy
; forest cover
; interception
; longwave radiation
; mountain environment
; snow accumulation
; snow water equivalent
; snowpack
; Cascade Range
; Oregon
; United States
英文摘要: Forest cover modifies snow accumulation and ablation rates via canopy interception and changes in sub-canopy energy balance processes. However, the ways in which snowpacks are affected by forest canopy processes vary depending on climatic, topographic and forest characteristics. Here we present results from a 4-year study of snow-forest interactions in the Oregon Cascades. We continuously monitored snow and meteorological variables at paired forested and open sites at three elevations representing the Low, Mid, and High seasonal snow zones in the study region. On a monthly to bi-weekly basis, we surveyed snow depth and snow water equivalent across 900 m transects connecting the forested and open pairs of sites. Our results show that relative to nearby open areas, the dense, relatively warm forests at Low and Mid sites impede snow accumulation via canopy snow interception and increase sub-canopy snowpack energy inputs via longwave radiation. Compared with the Forest sites, snowpacks are deeper and last longer in the Open site at the Low and Mid sites (4-26 and 11-33 days, respectively). However, we see the opposite relationship at the relatively colder High sites, with the Forest site maintaining snow longer into the spring by 15-29 days relative to the nearby Open site. Canopy interception efficiency (CIE) values at the Low and Mid Forest sites averaged 79 and 76 % of the total event snowfall, whereas CIE was 31 % at the lower density High Forest site. At all elevations, longwave radiation in forested environments appears to be the primary energy component due to the maritime climate and forest presence, accounting for 93, 92, and 47 % of total energy inputs to the snowpack at the Low, Mid, and High Forest sites, respectively. Higher wind speeds in the High Open site significantly increase turbulent energy exchanges and snow sublimation. Lower wind speeds in the High Forest site create preferential snowfall deposition. These results show the importance of understanding the effects of forest cover on sub-canopy snowpack evolution and highlight the need for improved forest cover model representation to accurately predict water resources in maritime forests. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79011
Appears in Collections: 气候变化事实与影响
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作者单位: Water Resource Sciences, Oregon State University, Corvallis, OR, United States
Recommended Citation:
Roth T,R,, Nolin A,et al. Forest impacts on snow accumulation and ablation across an elevation gradient in a temperate montane environment[J]. Hydrology and Earth System Sciences,2017-01-01,21(11)