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首页> 外文期刊>Journal of hydrometeorology >Ocean-atmosphere forcing of summer streamflow drought in Great Britain
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Ocean-atmosphere forcing of summer streamflow drought in Great Britain

机译：英国夏季洋流干旱的海洋强迫

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摘要

Droughts are high-impact events that have substantial implications for both human and natural systems. As such, improved understanding of the hydroclimatological processes involved in drought development is a major scientific imperative of direct practical relevance. To address this research need, this paper investigates the chain of processes linking antecedent ocean-atmosphere variation to summer streamflow drought in Great Britain. Analyses are structured around four distinct drought regions (defined using hierarchical cluster analysis) for the period 1964-2001. Droughts were identified using a novel regional drought area index. Composite analysis of monthly sea surface temperature (SST) prior to drought onset reveals a horseshoe- or tripole-shaped pattern of North Atlantic SST anomalies that is similar to patterns of SST anomalies associated with the North Atlantic Oscillation (NAO). Patterns in geopotential height, wind, moisture vapor flux, and precipitation prior to drought onset support the influence of the NAO but also demonstrate that the atmospheric bridge linking North Atlantic SST to drought development is too complex to be described solely by indices of the NAO. In revealing new information on the chain of processes leading to the development of hydrological drought in Great Britain, this paper has the potential to inform droughtforecasting research and so improve drought preparedness and management.
机译：干旱是影响人类和自然系统的重大事件。因此，对与干旱发展有关的水文气候过程的更好的了解是直接具有实际意义的主要科学要务。为了满足这一研究需求，本文研究了将前期海洋大气变化与英国夏季河流干旱联系起来的过程链。围绕1964-2001年的四个不同干旱地区（使用层次聚类分析定义）进行了分析。使用新的区域干旱地区指数来确定干旱。干旱开始之前的每月海表温度（SST）的综合分析显示，北大西洋SST异常的马蹄形或三脚形形状的模式类似于与北大西洋涛动（NAO）相关的SST异常的模式。干旱发生之前的地势高度，风，水汽通量和降水的模式支持了NAO的影响，但也表明将北大西洋海温与干旱发展联系在一起的大气桥太复杂了，无法仅由NAO的指标来描述。在揭示有关导致英国水文干旱发展的过程链的新信息时，本文有可能为干旱预测研究提供信息，从而改善干旱的准备和管理。

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