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20th Century Atmospheric Deposition and Acidification Trends in Lakes of the Sierra Nevada, California, USA

机译:美国内华达山脉的湖泊中的20世纪大气沉积和酸化趋势

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摘要

We investigated multiple lines of evidence to determine if observed and paleo-reconstructed changes in acid neutralizing capacity (ANC) in Sierra Nevada lakes were the result of changes in 20th century atmospheric deposition. Spheroidal carbonaceous particles (SCPs) (indicator of anthropogenic atmospheric deposition) and biogenic silica and δ~(13)C (productivity proxies) in lake sediments, nitrogen and sulfur emission inventories, climate variables, and long-term hydrochemistry records were compared to reconstructed ANC trends in Moat Lake. The initial decline in ANC at Moat Lake occurred between 1920 and 1930, when hydrogen ion deposition was approximately 74 eq ha~(-1) yr~(-1), and ANC recovered between 1970 and 2005. Reconstructed ANC in Moat Lake was negatively correlated with SCPs and sulfur dioxide emissions (p = 0.031 and p = 0.009). Reconstructed ANC patterns were not correlated with climate, productivity, or nitrogen oxide emissions. Late 20th century recovery of ANC at Moat Lake is supported by increasing ANC and decreasing sulfate in Emerald Lake between 19S3 and 2011 (p < 0.0001). We conclude that ANC depletion at Moat and Emerald lakes was principally caused by acid deposition, and recovery in ANC after 1970 can be attributed to the United States Clean Air Act.
机译:我们调查了多条证据,以确定内华达山脉湖泊中酸中和能力(ANC)的观测变化和古重建的变化是否是20世纪大气沉积变化的结果。比较了球形碳质颗粒(SCPs)(人为大气沉积的指标)和湖泊沉积物中的生物成因二氧化硅和δ〜(13)C(生产力代理),氮和硫的排放清单,气候变量以及长期水化学记录,将其与重建后的结果进行了比较。护城河ANC趋势。护城河ANC的最初下降发生在1920年至1930年之间,当时氢离子沉积约为74 eq ha〜(-1)yr〜(-1),ANC在1970年至2005年之间恢复。与SCPs和二氧化硫排放量相关(p = 0.031和p = 0.009)。重建的ANC模式与气候,生产力或氮氧化物排放量无关。 19世纪3到2011年之间,Moat湖中ANC的恢复受到ANC的增加和硫酸盐含量下降的支持(p <0.0001)。我们得出的结论是,护城河和翡翠湖的ANC损耗主要是由酸沉积引起的,1970年后ANC的恢复可以归因于《美国清洁空气法》。

著录项

  • 来源
    《Environmental Science & Technology》 |2014年第17期|10054-10061|共8页
  • 作者单位

    Department of Environmental Sciences, University of California, Riverside, California 92521, United States, National Park Service, 47050 Generals Highway, Three Rivers, California 93271, United States;

    Department of Environmental Sciences, University of California, Riverside, California 92521, United States;

    Environmental Change Research Centre, University College London, Gower Street, London WC1E 6BT, U.K.;

    Marine Science Institute, Evolution and Marine Biology, University of California, Santa Barbara, California 93106-6150, United States;

    Department of Environmental Sciences, University of California, Riverside, California 92521, United States;

    Marine Science Institute, Evolution and Marine Biology, University of California, Santa Barbara, California 93106-6150, United States, Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California 93106-6150, United States;

    Department of Geological Sciences, University of Florida, Gainesville, Florida 32611, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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