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Alluvial stratigraphic evidence for channel incision during the Mediaeval Warm Period on the central Great Plains, USA

机译：美国大平原中部中世纪暖期河道切口的冲积地层证据

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Alluvial valley fills from tributaries to the upper Republican River, southwest Nebraska, USA, provide soil- and morpho-stratigraphic evidence for an episode of channel incision that occurred between c. 1100 and 800 ~(14)C yr BP, based on 11 new radiocarbon ages. This local episode of channel incision correlates with other alluvial stratigraphic studies from the central Great Plains and demonstrates regionally synchronous fluvial behaviour. Proxy records of palaeohydrologic conditions in and around the Great Plains (including lacustrine, aeolian and geomorphological sources) indicate that channel incision correlates with a multicentennial episode of common, widespread drought. Temporally, this drought episode corresponds to the period recognized in many regions as the Mediaeval Warm Period (MWP). Therefore, this research demonstrates: (1) a relationship in the semi-arid central Great Plains between drought and increased fluvial incision; and (2) a local/regional geomorphic response to a particular episode of global climate change.
机译：从支流到美国内布拉斯加州西南部的共和河上游的冲积河谷填充物为c和c之间发生的河道切口事件提供了土壤和形态地层学证据。 1100和800〜（14）C yr BP，基于11个新的放射性碳年龄。河道切口的这一局部事件与来自大平原中部的其他冲积地层学研究相关，并显示了区域同步的河流行为。大平原及其周围地区（包括湖相，风成和地貌源）的古水文条件的代理记录表明，河道切开与常见的普遍干旱的百年历史有关。从时间上看，这种干旱事件对应于许多地区公认的中世纪暖期（MWP）。因此，这项研究表明：（1）半干旱中部大平原地区干旱与河流切口增加之间的关系； （2）对全球气候变化特定事件的局部/区域地貌响应。

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