Luminescence dating of sand–loess sequences and response of Mu Us and Otindag sand fields (north China) to climatic changes
Luminescence dating of sand–loess sequences and response of Mu Us and Otindag sand fields (north China) to climatic changes
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DOI：
10.1002/jqs.1234
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发表时间：
2009-05
影响因子：
2.3
通讯作者：
Yali Zhou;Huayu Lu;Jia-Fu Zhang;J. Mason;Liping Zhou
中科院分区：
文献类型：
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作者：
Yali Zhou;Huayu Lu;Jia-Fu Zhang;J. Mason;Liping Zhou
中国北方沙-黄过渡带对气候变化敏感，是研究过去环境变化的理想场所。然而，由于有限的数字测年，该地区过去千年-百年时间尺度的气候变化尚未得到很好的重建。沿着沙-黄土过渡带的毛乌素和奥亭达格沙地的桑迪壤土与风成砂层的交替，表明沙丘活动和稳定性的多个间隔。这种变化可能是对晚第四纪东亚季风气候变化的响应。单等分再生（SAR）光释光（OSL）测年协议，这已成功地应用于风成沉积物在世界各地，这两个砂场在这项研究中。光释光年龄为重建亚轨道时间尺度上过去气候变化提供了可靠的约束条件。这两个砂场的剖面都含有风成沙床，记录了千年尺度的干旱气候和广泛的沙丘活化事件，包括与北大西洋地区的海因里希事件5和新仙女木事件几乎同时发生的事件。这些结果表明，在中国北方半干旱地区的风成沉积物记录千年尺度的气候事件的潜力，也表明，在中国沙漠边缘的干湿气候变化可能与其他地方的气候变化在北方半球，通过大气环流。这篇文章于2008年11月27日在网上发表。后来发现了一个错误。该通知在网上和印刷版中均有刊登，以表明两者均已更正（2008年12月16日）。版权所有© 2008约翰威利父子有限公司。
The sand–loess transition zone in north China is sensitive to climate change, and is an ideal place to investigate past environmental changes. However, past climate change at millennial–centennial timescales in this region has not been well reconstructed because of limited numerical dating. Alternations of sandy loam soils with aeolian sand layers in the Mu Us and Otindag sand fields, which lie along the sand–loess transition zone, indicate multiple intervals of dune activity and stability. This change is probably a response to variations of the East Asian monsoon climate during the late Quaternary. The single aliquot regeneration (SAR) optically stimulated luminescence (OSL) dating protocol, which has been successfully applied to aeolian deposits worldwide, is applied to these two sand fields in this study. The OSL ages provide reliable constraints for reconstruction of past climate changes at suborbital timescale. Sections in both sand fields contain aeolian sand beds recording millennial‐scale episodes of dry climate and widespread dune activation, including episodes at about the same time as Heinrich Event 5 and the Younger Dryas in the North Atlantic region. These results demonstrate the potential of aeolian sediments in semi‐arid north China to record millennial‐scale climatic events, and also suggest that dry–wet climate variation at the desert margin in China may be linked to climatic change elsewhere in the Northern Hemisphere, through atmospheric circulation. This article was published online on 27 November 2008. An error was subsequently identified. This notice is included in the online and print versions to indicate that both have been corrected (16 December 2008). Copyright © 2008 John Wiley & Sons, Ltd.