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首页> 外文期刊>African Journal of Aquatic Science >Water level fluctuations in Lake Baringo, Kenya, during the 19th and 20th centuries: Evidence from lake sediments
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Water level fluctuations in Lake Baringo, Kenya, during the 19th and 20th centuries: Evidence from lake sediments

机译：19世纪和第20世纪，肯尼亚湖的水位波动：来自湖泊沉积物的证据

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摘要

This article presents a fossil diatom-based, semi-quantitative reconstruction of water level fluctuations for Lake Baringo over the past 200 years as a consequence of climatic variations. A 285 cm long sediment core sample was collected using a Rod-Operated Single-drive Stationary Piston corer. Lake level was inferred using indices based on the proportion of planktonic to benthic diatom taxa (P/B ratio). The sediment archive presented distinct zones dominated by planktonic and benthic diatom flora. An initial transgression in the early 19th century was characterised as a shallow water environment dominated by planktonic Aulacoseira spp. This was a response to extreme drought during the late 18th to early 19th century. Mid-19th century was defined by a high lake stand. The late 19th to early 20th centuries experienced low water level following the widely documented aridity at the time. The mid-20th century was marked by a spectacular rise in water level that coincided with remarkably wet years during the early 1960s and late 1970s. The first decade of the 21st century witnessed widespread changes in water level. The proxy records show that lake ramping and drawdown over the years follow approximately 50-year climatic cycles.
机译：本文由于气候变化，在过去的200年中提出了一种基于化石硅藻基，半量值重建水位的水位波动，这是气候变化的结果。使用杆操作的单驱静止式活塞乙醇机收集285厘米长的沉积物核心样品。使用基于浮游硅藻毒征（P / B比率）的浮游比例的指数推断湖泊水平。沉积物归档呈现由浮游和底栖硅藻土占主导地位的独特区域。 19世纪初的初步违规的特征在于由浮游菌Aulacoseira SPP主导的浅水环境。这是在18世纪末至19世纪初期对极端干旱的回应。 19世纪中期由高湖站定义。 20世纪初期到20世纪初期经历了低水位，后者当时广泛记录的美丽。 20世纪中期被水位的壮观崛起标志着，在20世纪60年代初和20世纪70年代初期恰逢潮湿。 21世纪的第一个十年目睹了水位的广泛变化。代理记录表明，多年来的湖坡道和缩减遵循大约为50年的气候周期。

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