气候变化领域集成服务门户(CCPortal): Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour

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DOI	10.5194/hess-24-115-2020
	Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour
	Michel A.; Brauchli T.; Lehning M.; Schaefli B.; Huwald H.
发表日期	2020
ISSN	1027-5606
起始页码	115
结束页码	142
卷号	24 期号:1
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.
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159530
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 Lausa...
推荐引用方式 GB/T 7714	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],2020,24(1).
APA	Michel A.,Brauchli T.,Lehning M.,Schaefli B.,&Huwald H..(2020).Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour.Hydrology and Earth System Sciences,24(1).
MLA	Michel A.,et al."Stream temperature and discharge evolution in Switzerland over the last 50 years: annual and seasonal behaviour".Hydrology and Earth System Sciences 24.1(2020).