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首页> 外文期刊>Journal of Paleolimnology >Late Quaternary paleoenvironments of an ephemeral wetland in North Dakota, USA: relative interactions of ground-water hydrology and climate change
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Late Quaternary paleoenvironments of an ephemeral wetland in North Dakota, USA: relative interactions of ground-water hydrology and climate change

机译：美国北达科他州一个短暂湿地的晚第四纪古环境：地下水水文学与气候变化的相对相互作用

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摘要

This study of fossils (pollen, plant macrofossils, stomata and fish) and sediments (lithostratigraphy and geochemistry) from the Wendel site in North Dakota, USA, emphasizes the importance of considering ground-water hydrology when deciphering paleoclimate signals from lakes in postglacial landscapes. The Wendel site was a paleolake from about 11,500 14C yr BP to 11,100 14C yr BP. Afterwards, the lake-level lowered until it became a prairie marsh by 9,300 14C yr BP and finally, at 8,500 14C yr BP, an ephemeral wetland as it is today. Meanwhile, the vegetation changed from a white spruce parkland (11,500 to 10,500 14C yr BP) to deciduous parkland, followed by grassland at 9,300 14C yr BP. The pattern and timing of these aquatic and terrestrial changes are similar to coeval kettle lake records from adjacent uplands, providing a regional aridity signal. However, two local sources of ground water were identified from the fossil and geochemical data, which mediated atmospheric inputs to the Wendel basin. First, the paleolake received water from the melting of stagnant ice buried under local till for about 900 years after glacier recession. Later, Holocene droughts probably caused the lower-elevation Wendel site to capture the ground water of up-gradient lakes.
机译：这项对美国北达科他州温德尔遗址的化石（花粉，植物大化石，气孔和鱼类）和沉积物（岩石地层学和地球化学）的研究强调了在解读冰川后景观中湖泊的古气候信号时，必须考虑地下水水文学的重要性。 Wendel地点是古隆起，从大约11,500 14 yr BP到11,100 14 yr BP。此后，湖水位下降，直到9300年BP成为草原沼泽，最后在8500 14 BP成为今天的临时湿地。同时，植被从白色的云杉林地（从11 500到14500 s yr BP）变为落叶的草原，然后是9300 14 yr的草地。这些水生和陆地变化的模式和时间与邻近高地的同期壶湖记录相似，提供了区域干旱信号。但是，从化石和地球化学数据中发现了两个当地地下水源，这些数据介导了向温德尔盆地的大气输入。首先，古冰川在冰川退缩后约900年的时间里吸收了停滞在当地的停滞冰融化后的水。后来，全新世的干旱可能导致海拔较低的Wendel地点捕获了上升湖泊的地下水。

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