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A high-resolution diatom-based Middle and Late Holocene environmental history of the Little Belt region, Baltic Sea

机译：基于高分辨率的硅藻基中期和晚期全新世环境历史，波罗的海

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摘要

The large-scale shifts in the salinity of the Baltic Sea over the Holocene are well understood and have been comprehensively documented using sedimentary proxy records. More recent work has focused on understanding how past salinity fluctuations have affected other ecological parameters (e.g. primary productivity, nutrient content) of the Baltic basin, and salinity changes over key events and over short time scales are still not well understood. The International Ocean Drilling Program Expedition 347 cored the Baltic basin in order to collect basin-wide environmental records through a glacial-interglacial cycle. Site M0059 is located in the Little Belt between the Baltic Sea and the Atlantic Ocean. A composite splice section from Site M0059 was analysed at a decadal resolution to study changes in salinity, nutrient conditions and other surface water column parameters based on changes in diatom assemblages and on quantitative diatom-based salinity inferences. A mesotrophic slightly brackish assemblage is seen in the lowermost analysed depths, corresponding to 7800-7500 cal. a BP. An increase in salinity and nutrient content of the water column leads into a meso-eutrophic brackish phase. The observed salinity increase is rapid, lasting from 7500 to 7150 cal. a BP. Subsequently, the Little Belt becomes oligotrophic and is dominated by tychopelagic diatoms from c. 7100 to c. 3900 cal. a BP. This interval contains some of the highest salinities observed followed by diatom assemblages similar to those of the Northern Atlantic Ocean, composed primarily of cosmopolitan open oceanmarine diatoms. A return to tychopelagic productivity is seen from 3850 to 980 cal. a BP. Anthropogenic eutrophication is detected in the last 300 years of the record, which intensifies in the uppermost sediments. These results represent the first decadally resolved record in the region and provide new insight into the transition to a brackish basin and subsequent ecological development.
机译：在全新世中，波罗的海盐度的大规模偏移得到了很好的理解，并通过沉积代理记录全面记录。最近的工作侧重于了解过去盐度波动如何影响波罗的盆地的其他生态参数（例如，初级生产力，营养含量），并在关键事件和短时间内进行盐度变化仍然无法清楚地理解。国际海洋钻井计划探险347核心波罗的海盆地，以通过冰川界循环收集盆地环境记录。网站M0059位于波罗的海和大西洋之间的小皮带中。分析来自位点M0059的复合剪接部分，以分辨率分析，以研究基于硅藻组合的变化和基于定量的硅藻基盐度推理的盐度，营养条件和其他表面水柱参数的变化。在最下分析的深度中看到了一种脑抚养的略微脆弱的组合，对应于7800-7500 Cal。 BP。水柱的盐度和营养素含量的增加导致脱蛋白蛋白质咸晶相。观察到的盐度增加迅速，持续7500至7150克。 BP。随后，小皮带变得低营养，由来自C的Tychopelagic硅藻占主导地位。 7100到c。 3900 cal。 BP。该间隔包含观察到的一些最高盐度，然后是北大西洋的硅藻汇编，主要由国际大陆海洋氨基氨纶硅藻土组成。从3850到980 Cal返回Tychopelagic生产率。 BP。在过去300年的记录中检测到人为富营养化，其在最上层沉积物中。这些结果代表了该地区的第一个截然解决的记录，并为转型到咸水盆地和随后的生态发展提供了新的洞察力。

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  • 来源
    《Boreas》 |2020年第1期|共16页
  • 作者

    Warnock Jonathan; Andren Elinor; Juggins Steve; Lewis Jonathan; Ryves David B.; Andren Thomas; Weckstrom Kaarina;

  • 作者单位

    Indiana Univ Penn Dept Geosci Indiana PA 15705 USA;

    Sodertorn Univ Sch Nat Sci Technol &

    Environm Studies SE-14189 Huddinge Sweden;

    Newcastle Univ Sch Geog Polit &

    Sociol Newcastle Upon Tyne NE1 7 RU Tyne &

    Wear England;

    Loughborough Univ Geog &

    Environm Loughborough LE11 3TU Leics England;

    Loughborough Univ Geog &

    Environm Loughborough LE11 3TU Leics England;

    Sodertorn Univ Sch Nat Sci Technol &

    Environm Studies SE-14189 Huddinge Sweden;

    Univ Helsinki Helsinki Inst Sustainabil Sci Ecosyst &

    Environm Res Programme ECRU POB 65 Viikinkaari 1 FIN-00014 Helsinki Finland;

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  • 正文语种 eng
  • 中图分类 历史地质学、地层学;
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