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首页> 外文期刊>Theoretical and applied climatology >Intensity, frequency and spatial configuration of winter temperature inversions in the closed La Brevine valley, Switzerland
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Intensity, frequency and spatial configuration of winter temperature inversions in the closed La Brevine valley, Switzerland

机译：瑞士封闭的拉布雷文山谷冬季温度反演的强度，频率和空间配置

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摘要

Some of the world's valleys are famous for having particularly cold microclimates. The La Brevine valley, in the Swiss Jura Mountains, holds the record for the lowest temperature ever measured in an inhabited location in Switzerland. We studied cold air pools (CAPs) in this valley during the winter of 2014-2015 using 44 temperature data loggers distributed between 1033 and 1293 m asl. Our goals were to (i) describe the climatic conditions under which CAPs form in the valley, (ii) examine the spatial configuration and the temperature structure of the CAPs and (iii) quantify how often temperature inversions occur in winter using long-term series of temperature from the valley floor. Our results show that CAPs occurred every second night, on average, during the winter of 2014-2015 and were typically formed under cloudless, windless and high-pressure conditions. Strong temperature inversions up to 28 A degrees C were detected between the valley floor and the surrounding hills. The spatial temperature structure of the CAPs varies among the different inversion days, with the upper boundary of the cold pool generally situated at about 1150 m asl. Although mean temperatures have increased in this area over the period 1960-2015 in connection with climate change, the occurrences of extreme cold temperatures did not decrease in winter and are highly correlated with the North Atlantic Oscillation and the East Atlantic indices. This suggests that CAPs in sheltered valleys are largely decoupled from the free atmosphere temperature and will likely continue to occur in the next decades under warmer conditions.
机译：世界上的某些山谷因气候特别寒冷而闻名。瑞士汝拉山脉的拉布雷维恩山谷（La Brevine）保持着有人居住的瑞士有史以来最低温度的记录。我们使用分布在1033至1293 m asl之间的44个温度数据记录器研究了该山谷在2014-2015年冬季的冷气池（CAPs）。我们的目标是（i）描述山谷中CAPs形成的气候条件，（ii）检查CAPs的空间配置和温度结构，以及（iii）使用长期序列量化冬季温度反转的频率谷底温度的变化。我们的结果表明，平均而言，CAP在2014-2015年冬季每隔第二个晚上发生一次，通常是在无云，无风和高压条件下形成的。在谷底和周围的山丘之间检测到高达28 A的强烈温度反转。 CAPs的空间温度结构在不同的反演天数中有所不同，冷池的上限通常位于1150 m asl。尽管在1960-2015年期间与气候变化相关的区域平均温度有所升高，但极端寒冷温度的出现并没有在冬季下降，并且与北大西洋涛动和东大西洋指数高度相关。这表明，庇护性山谷中的CAPs在很大程度上与自由大气温度脱钩，并可能在未来几十年中在温暖的条件下继续发生。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|1073-1083|共11页
  • 作者

    Vitasse Yann; Klein Geoffrey; Kirchner James W.; Rebetez Martine;

  • 作者单位

    Univ Neuchatel, Inst Geog, CH-2000 Neuchatel, Switzerland|Swiss Fed Inst Forest Snow & Landscape Res WSL, CH-2000 Neuchatel, Switzerland|WSL Inst Snow & Avalanche Res SLF, CH-7260 Davos, Switzerland;

    Univ Neuchatel, Inst Geog, CH-2000 Neuchatel, Switzerland|Swiss Fed Inst Forest Snow & Landscape Res WSL, CH-2000 Neuchatel, Switzerland;

    Swiss Fed Inst Technol, Dept Environm Syst Sci, CH-8092 Zurich, Switzerland|Swiss Fed Inst Forest Snow & Landscape Res WSL, CH-8903 Birmensdorf, Switzerland;

    Univ Neuchatel, Inst Geog, CH-2000 Neuchatel, Switzerland|Swiss Fed Inst Forest Snow & Landscape Res WSL, CH-2000 Neuchatel, Switzerland;

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