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首页> 外文期刊>Journal of great lakes research >Temporal and spatial differences in deposition of organic matter and black carbon in Lake Michigan sediments over the period 1850-2010
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Temporal and spatial differences in deposition of organic matter and black carbon in Lake Michigan sediments over the period 1850-2010

机译：1850-2010年密歇根湖沉积物中有机质和黑碳沉积的时空差异

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Inorganic carbon (IC), total organic carbon (OC), and black carbon (BC) were analyzed in eight sediment cores obtained from deep water (30 m) sediments in the Chippewa and south Chippewa basins, as well as Green Bay in Lake Michigan. These cores were segmented at high resolution and radio-dated to reconstruct a detailed history of deposition to the lake both spatially and temporally since ca.1850 CE. To help interpret the depositional record, cores were also characterized for stable isotopes (C-13 and N-15), as well as particle size distribution, density, organic matter (OM), and other parameters. Fine (silt and clay) sediment particles contained OM of primarily lacustrine algal biomass origin. Sedimentation fluxes showed large increases in OM and OC fluxes through much of the lake during the onset of industrialization and the period of rapid industrialization to onset of Great Lakes environmental legislation. In contrast, fluxes and loading of BC increased dramatically in the southern basin until the 1930's, then decreased substantially after the 1940's. This observation was due largely to results from site M009 nearest the steel mills and industrial zones of Chicago and northern Indiana. Together, whole lake loadings of OM and BC provide evidence that changing industrial activity and legislation intended to curb air pollution in the Great Lakes region have had a fairly rapid and dramatic impact In contrast, legislation intended to decrease eutrophication through reductions in nutrient loading to the lake have not had a similar impact on sedimentation of OM in the lake. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
机译：分析了从奇珀瓦盆地和奇珀瓦盆地南部的深水（> 30 m）沉积物中获得的八个沉积物芯中的无机碳（IC），总有机碳（OC）和黑碳（BC），以及湖中的绿湾密西根州自1850年左右以来，这些岩心以高分辨率进行了分段，并进行了放射性测年，以重建该湖在空间和时间上的详细沉积历史。为了帮助解释沉积记录，还对岩心进行了稳定同位素（C-13和N-15）以及粒径分布，密度，有机物（OM）和其他参数的表征。细（淤泥和粘土）沉积物颗粒主要包含湖藻藻类生物质来源的OM。在工业化初期以及大湖区环境立法开始快速工业化期间，沉积物通量在整个湖泊中的OM和OC通量大大增加。相反，在南部盆地直到1930年代，BC的通量和通量都急剧增加，而在1940年代之后，则显着下降。该观察结果主要是由于M009站点的结果最接近芝加哥和印第安纳州北部的钢铁厂和工业区。总的来说，OM和BC的整个湖水负荷提供​​了证据，表明不断变化的工业活动和旨在遏制大湖区空气污染的立法产生了相当迅速而显着的影响。相反，旨在通过减少营养盐负荷来减少富营养化的立法。湖泊对OM在湖泊中的沉积没有类似的影响。由Elsevier B.V.代表国际大湖研究协会出版。

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