Changing hydroclimate dynamics and the 19th to 20th century wetting trend in the English Channel region of northwest Europe

Changing hydroclimate dynamics and the 19th to 20th century wetting trend in the English Channel region of northwest Europe
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欧洲西北部英吉利海峡地区不断变化的水文气候动态和 19 至 20 世纪的湿润趋势

DOI:
10.1007/s00382-021-05977-5
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发表时间:
2021
期刊:
影响因子:
4.6
通讯作者:
Baek, Seung Hun
Baek, Seung Hun
中科院分区:
地球科学2区
文献类型:
--
作者:
Scholz, Serena R.;Seager, Richard;Ting, Mingfang;Kushnir, Yochanan;Smerdon, Jason E.;Cook, Benjamin I.;Cook, Edward R.;Baek, Seung Hun

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在过去的150年里,西北欧经历了一个越来越潮湿的冬天的趋势,几乎没有解释是什么导致了这种水文气候变化。在这里,我们使用旧世界干旱地图集(OWDA),一个基于树木年轮的重建自校准帕尔默干旱严重程度指数(scPDSI),检查这种湿润的趋势,并将其放置在一个较长的水文气候背景。我们发现,在欧洲西北部的scPDSI的变化是密切相关的主导模式的OWDA在过去的千年(1000-2012)。这种领先的模式,这里命名为“英吉利海峡”(EC)模式,有明显的年际变化百年的时间尺度,并在scPDSI的表达类似于东大西洋遥相关模式。在19世纪和20世纪,EC模式从长期的负相转变为更中性的条件,这与英格兰、威尔士和欧洲大陆北方大部分地区的湿润趋势有关。EC模态是大约1000-1850年的主导scPDSI模态,之后其主导性减弱,有利于次级“南北”(NS)模态,其在scPDSI中的表达类似于冬季北大西洋涛动(NAO)。我们研究这两种模式的动力学性质,以及它们如何在年际到百年的时间尺度上变化。我们的研究结果提供了深入了解欧洲水文气候变化的性质之前,仪器观测的广泛使用。
Northwestern Europe has experienced a trend of increasingly wet winters over the past 150 years, with few explanations for what may have driven this hydroclimatic change. Here we use the Old World Drought Atlas (OWDA), a tree-ring based reconstruction of the self-calibrating Palmer Drought Severity Index (scPDSI), to examine this wetting trend and place it in a longer hydroclimatic context. We find that scPDSI variability in northwestern Europe is strongly correlated with the leading mode of the OWDA during the last millennium (1000–2012). This leading mode, here named the ‘English Channel’ (EC) mode, has pronounced variability on interannual to centennial timescales and has an expression in scPDSI similar to that of the East Atlantic teleconnection pattern. A shift in the EC mode from a prolonged negative phase to more neutral conditions during the 19th and 20th centuries is associated with the wetting trend over its area of influence in England, Wales, and much of northern continental Europe. The EC mode is the dominant scPDSI mode from approximately 1000–1850, after which its dominance waned in favor of the secondary ‘North–South’ (NS) mode, which has an expression in scPDSI similar to that of the winter North Atlantic Oscillation (NAO). We examine the dynamical nature of both of these modes and how they vary on interannual to centennial timescales. Our results provide insight into the nature of hydroclimate variability in Europe before the widespread availability of instrumental observations.
DOI: 10.1175/jcli-d-20-0011.1
发表时间: 2020
期刊: Journal of Climate
影响因子: 4.9
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影响因子: 4.1
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