High‐resolution records of climate change in arid eastern central Asia during MIS 3 (51 600–25 300 cal a BP) from Wulungu Lake, north‐western China
High‐resolution records of climate change in arid eastern central Asia during MIS 3 (51 600–25 300 cal a BP) from Wulungu Lake, north‐western China
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DOI：
10.1002/jqs.2881
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发表时间：
2016-08
影响因子：
2.3
通讯作者：
Xiaonan Zhang;Aifeng Zhou;Can Zhang;S. Hao;Yongtao Zhao;C. An
中科院分区：
文献类型：
--
作者：
Xiaonan Zhang;Aifeng Zhou;Can Zhang;S. Hao;Yongtao Zhao;C. An
在干旱的中亚地区，末次冰期气候变化的详细记录很少。本文介绍了中国西北部乌伦古湖的沉积学和地球化学记录，首次提供了该地区海洋同位素阶段（MIS）3（51 600-25 300 cal a BP）的高分辨率连续沉积记录。高湖动力（端元2值）和生物生产力与低陆源碎屑输入一致表明，在46 180-39 770、31 680-30 080和27 780-26 540 cal a BP期间湖水位较高，在51 600-46 180和39 770-31 680 cal a BP期间为中等湿润条件。该湖在30080卡BP后达到最低水位。在研究的时间段内，记录了几个以高池功率（端元3值）和陆源输入为特征的干事件，其中三个与Heinrich事件5-3相关。我们的研究支持了一个假设，即北方半球7月的太阳辐射正异常，增加了低纬和高纬之间的温度梯度，增加了西风的强度，增加了北大西洋的海表温度，导致更多的水汽输送到干旱的亚洲中部的西风。
Detailed records of climate change during the Last Glaciation in arid central Asia are scarce. Here we present a sedimentological and geochemical record from Wulungu Lake in north‐western China, providing the first high‐resolution, continuous sedimentary records in this region covering Marine Isotope Stage (MIS) 3 (51 600–25 300 cal a BP). High lake power (end‐member 2 values) and bioproductivity concurrent with low terrigenous clastic input unanimously indicate high lake water levels during 46 180–39 770, 31 680–30 080 and 27 780–26 540 cal a BP, and moderately wet conditions during 51 600–46 180 and 39 770–31 680 cal a BP. The lake attained its lowest water levels after 30 080 cal a BP. Few dry events characterized by high pool power (end‐member 3 values) and terrigenous input are documented for the studied interval and three of them are correlative with Heinrich events 5–3. Our study supports the hypothesis for a positive Northern Hemisphere July insolation anomaly which increased the temperature gradient between low and high latitudes, increasing the strength of Westerlies and increasing sea surface temperatures in the North Atlantic, resulting in more moisture transported to arid central Asian by Westerlies.