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首页> 外文期刊>Journal of quaternary science: JQS >A high-resolution multi-proxy lake record of Holocene environmental change in southern Iceland
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A high-resolution multi-proxy lake record of Holocene environmental change in southern Iceland

机译：冰岛南部全新世环境变化的高分辨率多代理湖泊记录

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摘要

Vestra Gislholtsvatn, a non-glacial lake in southern Iceland, provides a continuous high-resolution multi-proxy paleoenvironmental record spanning more than 10 ka. It is characterized by an interplay between volcanic and climatic controls on the lake sediment environmental proxies. Initial lake ontogeny was disrupted by deposition of the Saksunarvatn tephra (approximate to 10.3 ka) followed by unusually slow ontogeny for 2 ka. Principal component analysis defines three climate zones between 8 and 1 ka. Quasi-stabilization and warm summer proxies between approximate to 8 and 5.7 ka define Holocene Thermal Maximum conditions. A subtle shift to cooler summers between approximate to 5.7 and approximate to 4.2 ka is interpreted as early Neoglaciation, intensifying after 4.2 ka. Following settlement of Iceland (approximate to 1.1 ka) anthropogenic signals overprint the climate record. Throughout the record short-term variability is attributed to tephra fall events in the catchment from nearby explosive volcanism, whereas centennial- and millennial-scale changes are attributed to climate. When compared with other Icelandic lakes, environmental proxies from Vestra Gislholtsvatn indicate less variability albeit similar timing of environmental change, suggesting a relatively stable flow of the Irminger Current along the south coast of Iceland compared with a more variable flow of warm Atlantic surface water along the western and northern coasts of Iceland after 8 ka.
机译：Vestra Gislholtsvatn是冰岛南部的非冰川湖泊，提供了连续的高分辨率多代理古环境记录，记录范围超过10 ka。它的特征是湖泊沉积物环境代理中的火山与气候控制之间的相互作用。最初的湖泊发育被Saksunarvatn tephra（约10.3 ka）的沉积破坏，随后异常缓慢的发育为2 ka。主成分分析定义了介于8和1 ka之间的三个气候带。准稳定化和大约在8到5.7 ka之间的夏季温暖代理定义了全新世的热最大条件。在大约5.7和大约4.2 ka之间向较凉的夏天的微妙转变被解释为早期新冰期，在4.2 ka之后加剧。冰岛定居后（约1.1 ka），人为信号覆盖了气候记录。在整个记录中，短期变化是由于附近爆炸性火山爆发导致流域的特菲拉坠落事件造成的，而百年和千禧年尺度的变化则归因于气候。与其他冰岛湖泊相比，来自Vestra Gislholtsvatn的环境指标表明，尽管环境变化的时机相似，但变化性较小，这表明沿冰岛南海岸的艾明格海流相对稳定，而沿大西洋南部的温暖的大西洋地表水则变化较大。 8 ka之后，冰岛的西部和北部海岸。

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