globalchange  > 气候变化与战略
DOI: 10.5194/hess-24-115-2020
论文题名:
Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour
作者: Michel A.; Brauchli T.; Lehning M.; Schaefli B.; Huwald H.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期:1
起始页码: 115
结束页码: 142
语种: 英语
Scopus关键词: Atmospheric temperature ; Catchments ; Ecology ; Lakes ; Water management ; Discharge evolution ; Hydrological variables ; Mathematical frameworks ; Stream temperatures ; Strengthening effect ; Temperature thresholds ; Water temperature trend ; Waterresource management ; Rivers ; air temperature ; annual variation ; catchment ; discharge ; melting ; precipitation (climatology) ; seasonality ; stream ; warming ; water management ; water resource ; water temperature ; Alps ; Switzerland
英文摘要: Stream temperature and discharge are key hydrological variables for ecosystem and water resource management and are particularly sensitive to climate warming. Despite the wealth of meteorological and hydrological data, few studies have quantified observed stream temperature trends in the Alps. This study presents a detailed analysis of stream temperature and discharge in 52 catchments in Switzerland, a country covering a wide range of alpine and lowland hydrological regimes. The influence of discharge, precipitation, air temperature, and upstream lakes on stream temperatures and their temporal trends is analysed from multi-decadal to seasonal timescales. Stream temperature has significantly increased over the past 5 decades, with positive trends for all four seasons. The mean trends for the last 20 years are C0:37±0:11 °C per decade for water temperature, resulting from the joint effects of trends in air temperature (C0:39± 0:14 °C per decade), discharge (-10:1±4:6% per decade), and precipitation (-9:3±3:4% per decade). For a longer time period (1979-2018), the trends are C0:33±0:03 °C per decade for water temperature, +0.46±0.03°C per decade for air temperature, -3:0±0:5% per decade for discharge, and -1:3±0:5% per decade for precipitation. Furthermore, we show that snow and glacier melt compensates for air temperature warming trends in a transient way in alpine streams. Lakes, on the contrary, have a strengthening effect on downstream water temperature trends at all elevations. Moreover, the identified stream temperature trends are shown to have critical impacts on ecological and economical temperature thresholds (the spread of fish diseases and the usage of water for industrial cooling), especially in lowland rivers, suggesting that these waterways are becoming more vulnerable to the increasing air temperature forcing. Resilient alpine rivers are expected to become more vulnerable to warming in the near future due to the expected reductions in snowand glacier-melt inputs. A detailed mathematical framework along with the necessary source code are provided with this paper. © Author(s) 2020.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162820
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作者单位: Michel, A., School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, WSL Institute for Snow and Avalanche Research (SLF), Davos, Switzerland; Brauchli, T., School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, Faculty of Geosciences and Environment, University of Lausanne, Lausanne, Switzerland, Centre de Recherche sur l'Environnement Alpin (CREALP), Sion, Switzerland; Lehning, M., School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, WSL Institute for Snow and Avalanche Research (SLF), Davos, Switzerland; Schaefli, B., Faculty of Geosciences and Environment, University of Lausanne, Lausanne, Switzerland, Institute of Geography, University of Bern, Bern, Switzerland; Huwald, H., School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, WSL Institute for Snow and Avalanche Research (SLF), Davos, Switzerland

Recommended Citation:
Michel A.,Brauchli T.,Lehning M.,et al. Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour[J]. Hydrology and Earth System Sciences,2020-01-01,24(1)
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