Untangling the influence of in-lake productivity and terrestrial organic matter flux on 4,250?years of mercury accumulation in Lake Hambre, Southern Chile
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- 作者：Yvonne-Marie Hermanns (1)
Antonio Martinez Cortizas (2)
Helge Arz (3)
Rüdiger Stein (4)
Harald Biester (1) - 关键词：Mercury ; Lake sediments ; Patagonia ; Algal scavenging ; Terrestrial organic matter
- 刊名：Journal of Paleolimnology
- 出版年：2013
- 出版时间：April 2013
- 年：2013
- 卷：49
- 期：4
- 页码：563-573
- 全文大小：513KB
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Antonio Martinez Cortizas (2)
Helge Arz (3)
Rüdiger Stein (4)
Harald Biester (1)
1. Institut für Geo?kologie, Technische Universit?t Braunschweig, Langer Kamp 19c, 38106, Braunschweig, Germany
2. Department of Pedology and Agricultural Chemistry, Faculty of Biology, University of Santiago de Compostela, Rúa Lope Gómez de Marzóa s/n, Campus Sur, 15782, Santiago de Compostela, Spain
3. Leibniz Institute for Baltic Sea Research Warnemünde, Seestra?e 15, 18819, Rostock, Warnemünde, Germany
4. Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, 27568, Bremerhaven, Germany - ISSN：1573-0417
文摘
There is ongoing debate about the relative influence of aquatic production, flux, and sedimentation of aquatic and terrestrial organic matter on mercury accumulation in lake sediments. In this study, lake sediments spanning the past 4,250?years, were collected from remote, organic-rich Lake Hambre, Patagonia (53°?S) and investigated for changes in the accumulation of pre-anthropogenic mercury and organic matter of aquatic and terrestrial origin. Natural mercury accumulation varied by up to a factor of four, comparable to the recent anthropogenic forcing of the mercury cycle (factor 3-). Hydrogen and Oxygen indices (HI and OI, Rock–Eval?) and nitrogen/carbon ratios of the organic matter, combined with multi-element sediment data, reveal intense changes in aquatic productivity as well as influx of terrestrial organic matter into the lake. Evaluation of the multi-element dataset using Principal Component Analysis shows clear covariation of mercury with other soil-derived elements such as copper and yttrium. This covariance reflects a common transport mechanism, i.e. leaching of trace-element-bearing organic matter complexes from catchment soils. Correlation between changes in aquatic productivity and mercury concentrations occurs in some sections of the record, but we do not suggest they are linked by a direct causal relationship. Mass balance approaches suggest that mercury scavenging and accumulation in this organic-rich lake is controlled by the supply of mercury from catchment soils rather than the amount of organic material produced within the water column. A common controlling mechanism, i.e. changing climate, however, is thought to independently drive variations in both the flux of terrestrial organic matter mercury complexes and aquatic productivity.