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首页> 外文期刊>The holocene >Air pollutant contamination and acidification of surface waters in the North York Moors, UK: Multi-proxy evidence from the sediments of a moorland pool
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Air pollutant contamination and acidification of surface waters in the North York Moors, UK: Multi-proxy evidence from the sediments of a moorland pool

机译：英国北约克郡高沼地的空气污染物污染和地表水酸化：来自高沼地池沉积物的多重代理证据

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摘要

Despite the extensive geographical range of palaeolimnological studies designed to assess the extent of surface water acidification in the United Kingdom during the 1980s, little attention was paid to the status of surface waters in the North York Moors (NYM). In this paper, we present sediment core data from a moorland pool in the NYM that provide a record of air pollution contamination and surface water acidification. The 41-cm-long core was divided into three lithostratigraphic units. The lower two comprise peaty soils and peats, respectively, that date to between approximately 8080 and 6740 cal. BP. The uppermost unit comprises peaty lake muds dating from between approximately ad 1790 and the present day (ad 2006). The lower two units contain pollen dominated by forest taxa, whereas the uppermost unit contains pollen indicative of open landscape conditions similar to those of the present. Heavy metal, spheroidal carbonaceous particle, mineral magnetics and stable isotope analysis of the upper sediments show clear evidence of contamination by air pollutants derived from fossil-fuel combustion over the last c. l50years, and diatom analysis indicates that the naturally acidic pool became more acidic during the 20th century. We conclude that the exceptionally acidic surface waters of the pool at present (pH = c. 4.1) are the result of a long history of air pollution and not because of naturally acidic local conditions. We argue that the highly acidic surface waters elsewhere in the NYM are similarly acidified and that the lack of evidence of significant recovery from acidification, despite major reductions in the emissions of acidic gases that have taken place over the last c. 30years, indicates the continuing influence of pollutant sulphur stored in catchment peats, a legacy of over 150years of acid deposition.
机译：尽管1980年代英国进行了旨在评估地表水酸化程度的古湖泊学研究的广泛地理范围，但对北约克郡高地（NYM）地表水的状况却鲜有关注。在本文中，我们介绍了来自纽约市高沼地池的沉积物核心数据，这些数据提供了空气污染污染和地表水酸化的记录。 41厘米长的岩心被分为三个岩石地层单元。下部的两个分别包括豌豆土和泥炭，可追溯到大约8080到6740 cal之间。 BP。最上面的单元包括从大约1790年到今天（大约2006年）之间的泥潭湖泥。最下面的两个单元包含以森林分类单元为主的花粉，而最上面的单元包含指示与当前景观相似的开放景观条件的花粉。重金属，球状碳质颗粒，矿物磁学和上部沉积物的稳定同位素分析表明，在最后c期间，化石燃料燃烧产生的空气污染物污染了明显证据。 150年来，硅藻分析表明，天然酸性物质在20世纪变得更加酸性。我们得出的结论是，目前游泳池中异常酸性的地表水（pH = c。4.1）是空气污染历史悠久的结果，而不是由于当地自然酸性条件而造成的。我们认为纽约州其他地方的高酸性地表水也被酸化，尽管过去c以来酸性气体的排放量已大大减少，但缺乏从酸化中大量回收的证据。 30年表明储藏在泥炭中的污染物硫的持续影响，这是150多年酸沉降的遗产。

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