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首页> 外文期刊>Environmental Science & Technology >Spatial and Temporal Assessment of Mercury and Organic Matter in Thermokarst Affected Lakes of the Mackenzie Delta Uplands, NT, Canada
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Spatial and Temporal Assessment of Mercury and Organic Matter in Thermokarst Affected Lakes of the Mackenzie Delta Uplands, NT, Canada

机译：加拿大新罕布什尔州麦肯齐三角洲高地受喀斯特影响的湖泊中汞和有机质的时空评估

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摘要

We examined dated sediment cores from 14 thermokarst affected lakes in the Mackenzie Delta uplands, NT, Arctic Canada, using a case-control analysis to determine how retrogressive thaw slump development from degrading permafrost affected the delivery of mercury (Hg) and organic carbon (OC) to lakes. We show that sediments from the lakes with retrogressive thaw slump development on their shorelines (slump-affected lakes) had higher sedimentation rates and lower total Hg (THg), methyl mercury (MeHg), and lower organic carbon concentrations compared to lakes where thaw slumps were absent (reference lakes). There was no difference in focus-corrected Hg flux to sediments between reference lakes and slump-affected lakes, indicating that the lower sediment Hg concentration in slump-affected lakes was due to dilution by rapid inorganic sedimentation in the slump-affected lakes. Sedimentation rates were inversely correlated with THg concentrations in sediments among the 14 lakes considered, and explained 68% of the variance in THg concentration in surface sediment, further supporting the dilution hypothesis. We observed higher S2 (algal-derived carbon) and particulate organic carbon (POC) concentrations in sediment profiles from reference lakes than in slump lakes, likely because of dilution by inorganic siliciclastic matter in cores from slump-affected lakes. We conclude that retrogressive thaw slump development increases inorganic sedimentation in lakes, and decreases concentrations of organic carbon and associated Hg and MeHg in sediments.
机译：我们使用病例对照分析研究了来自加拿大北极地区麦肯齐三角洲高地，西北麦肯奇三角洲高地的14个受热喀斯特影响的沉积岩心，并通过病例对照分析确定了由于多年冻土退化导致的退融性坍落度发展如何影响汞（Hg）和有机碳（OC）的输送）到湖泊。我们显示，与融化坍塌的湖泊相比，海岸线上融化坍塌发展缓慢的湖泊（受坍塌影响的湖泊）的沉积物具有更高的沉积速率和更低的总汞（THg），甲基汞（MeHg）和较低的有机碳浓度。缺席（参考湖泊）。在参考湖泊和受塌陷影响的湖泊之间，经校正后的沉积物汞通量没有差异，表明受塌陷影响的湖泊中较低的沉积物汞浓度是由于受塌陷影响的湖泊中无机物快速沉积所稀释。沉积速率与所考虑的14个湖泊中沉积物中THg浓度成反比，并解释了表层沉积物中THg浓度变化的68％，进一步支持了稀释假说。我们观察到参考湖中沉积物剖面中的S2（藻类碳）和颗粒有机碳（POC）浓度高于坍落度湖泊，这可能是由于受坍落度影响的湖泊岩心中的无机硅质物质稀释所致。我们得出的结论是，退融性坍落度的发展会增加湖泊中的无机沉积，并降低沉积物中有机碳的浓度以及相关的Hg和MeHg。

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  • 来源
    《Environmental Science & Technology》 |2012年第16期|p.8748-8755|共8页
  • 作者

    Ramin Deison; John P. Smol; Steve V. Kokelj; Michael F. J. Pisaric; Linda E. Kimpe; Alexandre J. Poulain; Hamed Sanei; Joshua R. Thienpont; Jules M. Blais;

  • 作者单位

    Program for Chemical and Environmental Toxicology, Department of Biology, University of Ottawa, ON, KIN 6N5, Canada;

    Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen's University, Kingston, ON, K7L 3N6, Canada;

    Cumulative Impact Monitoring Program, Aboriginal Affairs and Northern Development Canada, NWT Geoscience Office, P.O. Box 1500, Yellowknife, NT, X1A 2R3, Canada;

    Department of Geography and Environmental Studies, B353 Loeb Building, Carleton University, 1125 Colonel By Drive Ottawa, ON, K1S-5B6, Canada;

    Program for Chemical and Environmental Toxicology, Department of Biology, University of Ottawa, ON, KIN 6N5, Canada;

    Program for Chemical and Environmental Toxicology, Department of Biology, University of Ottawa, ON, KIN 6N5, Canada;

    Geological Survey of Canada-Calgary, 3303 33rd Street NW, Calgary, AB, T2L 2A7, Canada;

    Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen's University, Kingston, ON, K7L 3N6, Canada;

    Program for Chemical and Environmental Toxicology, Department of Biology, University of Ottawa, ON, KIN 6N5, Canada;

  • 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);
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