Diatom-based inference of variations in the strength of Asian winter monsoon winds between 17,500 and 6000 calendar years B.P
Diatom-based inference of variations in the strength of Asian winter monsoon winds between 17,500 and 6000 calendar years B.P
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DOI：
10.1029/2008jd010145
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发表时间：
2008-11
影响因子：
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通讯作者：
Luo Wang;Houyuan Lu;Jia-qi Liu;Z. Gu;J. Mingram;G. Chu;Jingjing Li;P. Rioual;J. Negendank;Jingtai Han;Tung-sheng Liu
中科院分区：
文献类型：
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作者：
Luo Wang;Houyuan Lu;Jia-qi Liu;Z. Gu;J. Mingram;G. Chu;Jingjing Li;P. Rioual;J. Negendank;Jingtai Han;Tung-sheng Liu
[1]本文报道了中国东南部湖广玛珥湖（HML）硅藻化石的连续记录，时间跨度为17，500 ~ 6000年优势硅藻类群Aulacoseira和Cyclotella物种相对丰度的季节性变化可用作冬季季风强度（WMW）的代表，这是支持在HML的沉积物陷阱实验的结果，并通过对这些物种的自生态学的文献进行了广泛的审查。在沉积物中，高C. stelligera丰度和高硅藻浓度，这表明温暖的条件和低风力驱动的水柱湍流，表征相当于格陵兰Interstadial 1的间隔。其次是低硅藻浓度的间隔和Aulacoseira物种，这表明高风力驱动的湍流，因此强大的WMW为主的组合。这段时间与格陵兰体育场1相对应。在全新世早期和中期，另外两个事件与强大的WMW是明显的，从10,000和8500之间和7000和6000 cal年B. P.的硅藻记录表明，强大的冬季风事件不仅发生在末次冰期-全新世的过渡，而且在全新世的“热最大”。
[1] We present a continuous record of fossil diatoms from Huguang Maar Lake (HML) in southeastern China, spanning the time interval 17,500 to 6000 calendar years (cal years) B.P. The seasonal change in relative abundance of the dominant diatom taxa, Aulacoseira and Cyclotella species, can be used as a proxy of the strength of winter monsoon winds (WMW), which is supported by the results of a sediment trap experiment in HML and by an extensive review of the literature on the autoecologies of these species. In the sediment, high C. stelligera abundance and high-diatom concentration, which indicate warm conditions and low wind-driven turbulence of the water column, characterize an interval equivalent to the Greenland Interstadial 1. This is followed by an interval with low-diatom concentration and with assemblages dominated by Aulacoseira species, which suggests high wind-driven turbulence and therefore strong WMW. This interval corresponds with the Greenland Stadial 1. During the early and middle Holocene, another two episodes with strong WMW are evident from the data between 10,000 and 8500 and between 7000 and 6000 cal years B.P. The diatom record implies that strong winter monsoon episodes not only occurred during the last glacial-Holocene transition but also during the Holocene “thermal maximum.”