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The 'Little Ice Age' recorded by sediment chemistry in Lake Erhai, southwest China

机译：沉积物化学记录的“小冰河期”在中国西南Age海

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摘要

On the basis of concentrations of 21 major and minor elements in a well-dated sediment core from the deepwater part of Lake Erhai, principal component analysis (PCA) reveals three main factors controlling the inorganic chemical composition of lake sediments. These are physical erosion in the watershed (Component 1), autochthonous calcite precipitation in lake water (Component 2) and early diagenesis in sediments (Component 3). Variations of factor scores of Component 1 and Component 3 may reflect fluctuations in rainfall and temperature, respectively in the lake region. High factor scores of Component 3 correlate with low factor scores of Component 1 in sediments within the intervals AD 1340-1550 and AD 1890-1950, indicating two warm-dry episodes. Low factor scores of Component 3 correlate with high factor scores of Component 1 from AD 1550-1890, indicating a cold-wet climate corresponding to the 'Little Ice Age' in Europe. Our study provides a new approach to reconstructing palaeoclimate, and adds to a growing body of evidence for a widespread cooling during the 'Little Ice Age". The alternation between warm-dry and cool-humid conditions possibly implies different climate change characteristics between the southwest monsoon zone and the southeast monsoon zone where the climate pattern is warm-humid and cool-dry.
机译：根据Er海深水区一个陈旧的沉积岩心中21种主要和次要元素的浓度，主成分分析（PCA）揭示了控制湖泊沉积物无机化学成分的三个主要因素。这些是流域的物理侵蚀（组分1），湖水中的方解石沉淀（组分2）和沉积物中的早期成岩作用（组分3）。组件1和组件3的因子得分的变化可能分别反映了湖区降雨和温度的波动。在时间间隔AD 1340-1550和AD 1890-1950内，沉积物中组分3的高因子得分与组分1的低因子得分相关，表明出现了两次暖干事件。组分3的低因子得分与公元1550-1890年的组分1的高因子得分相关，表明与欧洲的“小冰河时代”相对应的冷湿气候。我们的研究提供了一种重建古气候的新方法，并为“小冰期”期间广泛的降温提供了越来越多的证据，暖干和冷湿条件的交替可能暗示西南地区之间气候变化特征不同。季风区和东南季风区，气候模式为温暖湿润和凉爽干燥。

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