It is well known that Arctic sea ice and Arctic amplification have played an important role in recent climate change in middle to high latitudes of the Northern Hemisphere. We present a high-resolution elemental data set, spanning the past 9,000 years, obtained using in-situ synchrotron radiation X-ray fluorescence measurements of a lake sediment core from Lake Shuang in the Altai Mountains. Based on calibration against the local instrumental climatic record, the Rb/Sr ratio of the sediments is interpreted as an indicator of weathering intensity, which is related to precipitation and temperature variations. There is very little bromine in the granites and moyites in the catchment of Lake Shuang, and the sedimentary Br is derived primarily from wet deposition originating from precipitation and enriched by biogenic processes in this open lake system. The Br variation is positively correlated with local precipitation. The Rb/Sr and Br time series show distinct decadal-scale to millennial-scale cycles that are similar to those of Arctic sea-ice variations, which implies the important role of Artic sea ice in modulating environmental change at Lake Shuang. Our results support a previous suggestion that sea ice loss would cause an increase in atmospheric water vapor content in the Arctic, resulting in the frequent incursion of cold air masses from the Arctic into middle latitudes, and leading to increased snow cover and precipitation, and vice versa.

中文翻译：

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来自阿尔泰山脉中部高山湖泊全新世沉积物的高分辨率元素记录：对北极海冰变化的影响

众所周知，北极海冰和北极放大在近期北半球中高纬度地区的气候变化中发挥了重要作用。我们提供了一个跨越过去 9,000 年的高分辨率元素数据集，这些数据集是通过对阿尔泰山脉双湖湖沉积物核心的原位同步辐射 X 射线荧光测量获得的。基于对当地仪器气候记录的校准，沉积物的 Rb/Sr 比被解释为风化强度的指标，它与降水和温度变化有关。双湖集水区的花岗岩和黑斑岩中溴含量极少，沉积溴主要来源于该开放湖系统中降水产生的湿沉积，并通过生物成因过程富集。Br 变化与当地降水呈正相关。Rb/Sr 和 Br 时间序列显示出与北极海冰变化相似的不同年代际尺度到千年尺度的循环，这意味着北极海冰在调节双湖环境变化中的重要作用。我们的研究结果支持先前的观点，即海冰消失会导致北极大气水汽含量增加，导致冷气团从北极频繁侵入中纬度地区，导致积雪和降水增加，反之亦然。反之。这意味着北极海冰在调节双湖环境变化中的重要作用。我们的研究结果支持先前的观点，即海冰消失会导致北极大气水汽含量增加，导致冷气团从北极频繁侵入中纬度地区，导致积雪和降水增加，反之亦然。反之。这意味着北极海冰在调节双湖环境变化中的重要作用。我们的研究结果支持先前的观点，即海冰消失会导致北极大气水汽含量增加，导致冷气团从北极频繁侵入中纬度地区，导致积雪和降水增加，反之亦然。反之。