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Changing summer precipitation variability in the Alpine region: on the role of scale dependent atmospheric drivers
Climate Dynamics ( IF 4.6 ) Pub Date : 2021-04-10 , DOI: 10.1007/s00382-021-05753-5
Klaus Haslinger 1 , Michael Hofstätter 2 , Wolfgang Schöner 3 , Günter Blöschl 4
Affiliation  

Summer precipitation totals in the Alpine Region do not exhibit a systematic trend over the last 120 years. However, we find significant low frequency periodicity of interannual variability which occurs in synchronization with a dominant two-phase state of the atmospheric circulation over the Alps. Enhanced meridional flow increases precipitation variability through positive soil moisture precipitation feedbacks on the regional scale, whereas enhanced zonal flow results in less variability through constant moisture flow from the Atlantic and suppressed feedbacks with the land surface. The dominant state of the atmospheric circulation over the Alps in these periods appears to be steered by zonal sea surface temperature gradients in the mid-latitude North Atlantic. The strength and the location of the westerlies in the mid-latitude Atlantic play an important role in the physical mechanisms linking atmosphere and oceanic temperature gradients and the meridional/zonal circulation characteristics.



中文翻译:

阿尔卑斯地区夏季降水变化的变化:关于尺度依赖的大气驱动因素的作用

在过去的 120 年中,高山地区的夏季降水总量没有表现出系统性的趋势。然而,我们发现年际变化的显着低频周期性与阿尔卑斯山大气环流的主要两相状态同步发生。增强的经向流通过区域尺度上土壤水分降水的正反馈增加了降水变异性,而增强的纬向流通过来自大西洋的恒定水分流和抑制与地表的反馈导致了较小的变异性。在这些时期阿尔卑斯山大气环流的主导状态似乎受到北大西洋中纬度地区海面温度梯度的控制。

更新日期:2021-04-11
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