Trends in Swiss Alpine snow days: The role of local‐ and large‐scale climate variability
Trends in Swiss Alpine snow days: The role of local‐ and large‐scale climate variability
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DOI：
10.1029/2004gl020255
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发表时间：
2004-07
影响因子：
5.2
通讯作者：
S. Scherrer;C. Appenzeller;M. Laternser
中科院分区：
文献类型：
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作者：
S. Scherrer;C. Appenzeller;M. Laternser
瑞士阿尔卑斯山的积雪在年际到十年的时间尺度上变化很大。在20世纪后期，观测到海拔1300米以下的站点的降雪天数(SD)有所减少。在这项工作中使用回归模型来量化平均温度和降水量以及大范围气候变率的重要性，以便解释观察到的趋势。在观测到的季节变化中，本地模式和大型模式都只占了一小部分。结果表明，近期低海拔积雪减少的主要原因是气温上升。在大尺度气候模式的影响方面，瑞士北部和南部存在差异。与南部高山地区相比，北部高山地区的SD年际变化几乎不受北大西洋涛动(NAO)的影响。然而，年代际趋势只能通过包含解释变量NAO的模型来解释。
Swiss Alpine snow cover is varying substantially on interannual to decadal time scales. In the late 20th century decreases in snow days (SD) have been observed for stations below 1300 m asl. A regression model is used in this work to quantify the importance of mean temperature and precipitation as well as large‐scale climate variability in order to explain the observed trends. Both, local‐ and large‐scale models account for a modest fraction of the observed seasonal variability. Results suggest that the recent decrease in low altitude snow cover can mainly be attributed to an increase in temperature. Differences are found for northern and southern Switzerland concerning the influence of large‐scale climate patterns. In contrast to southern Alpine regions, northern Alpine interannual SD variability is almost unaffected by the North Atlantic Oscillation (NAO). Decadal trends, however, can be explained via temperature only by a model that includes the explanatory variable NAO.