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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Seasonal controls on sediment transport and deposition in Lake Ohau, South Island, New Zealand: Implications for a high-resolution Holocene palaeoclimate reconstruction
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Seasonal controls on sediment transport and deposition in Lake Ohau, South Island, New Zealand: Implications for a high-resolution Holocene palaeoclimate reconstruction

机译：新西兰南岛奥豪湖沉积物运移和沉积的季节性控制：对高分辨率全新世古气候重建的启示

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摘要

Laminated sediments in Lake Ohau, Mackenzie Basin, New Zealand, offer a potential high-resolution climate record for the past 17 kyr. Such records are particularly important due to the relative paucity of detailed palaeoclimate data from the Southern Hemisphere mid-latitudes. This paper presents outcomes of a study of the sedimentation processes of this temperate lake setting. Hydrometeorological, limnological and sedimentological data were collected over a 14 month period between 2011 and 2013. These data indicate that seasonality in the hydrometeorological system in combination with internal lake dynamics drives a distinct seasonal pattern of sediment dispersal and deposition on a basin-wide scale. Sedimentary layers that accumulate proximal to the lake inflow at the northern end of the lake form in response to discrete inflow events throughout the year and display an event stratigraphy. In contrast, seasonal change in the lake system controls accumulation of light (winter) and dark (summer) laminations at the distal end of the lake, resulting in the preservation of varves. This study documents the key processes influencing sediment deposition throughout Lake Ohau and provides fundamental data for generating a high-resolution palaeoclimate record from this temperate lake.
机译：新西兰麦肯齐盆地奥豪湖的层状沉积物提供了过去17年的高分辨率气候记录。由于来自南半球中纬度的详细古气候数据相对较少，因此此类记录尤为重要。本文介绍了对这个温带湖泊环境沉积过程的研究成果。在2011年至2013年之间的14个月内，收集了水文气象学，湖泊学和沉积学数据。这些数据表明，水文气象系统的季节性与内部湖泊动态相结合，在整个盆地范围内驱动了独特的季节性沉积物扩散和沉积模式。在全年中，由于对离散的入渗事件的响应，形成了沉积层，这些沉积层在湖泊北端的湖泊入流附近积累，并形成了一个地层。相反，湖泊系统的季节性变化控制了湖泊远端的浅色（冬季）和深色（夏季）层积，从而保护了脉管。这项研究记录了影响整个奥豪湖沉积物的关键过程，并提供了从该温带湖泊生成高分辨率古气候记录的基础数据。

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