基于小波分析的腾冲青海沉积记录全新世气候变化研究
首发时间:2016-01-12
摘要:通过对腾冲青海火山湖沉积物的中值粒径、有机质、碳酸盐含量及磁化率环境代用指标综合分析,结合AMS14C年代序列及小波变换,探讨了探讨全新世以来腾冲青海流域全新世气候波动及周期,进而探究全新世以来西南季风全新世气候的演化特征及驱动机制。研究结果表明:全新世以来腾冲青海气候记录中存在~1000a,~500a,~250a三个较为明显的准周期信号,其中1000a、500a准周期信号较强,且一直存在于全新世阶段。青海湖沉积记录中的1000a准周期受太阳辐射变化驱动,500a准周期与大西洋温盐环流相关,而250a准周期则与太阳deVries 周期一致。
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The Holocene climate fluctuations and cycle of the Qinghai Lake catchment in Southwest China based on wavelet analysis
Abstract:Based on the environmental multi-proxy indicators of Qinghai Lake, such as grain-size, total organic carbon (TOC), and carbonate content (CaCO3), magnetic susceptibility. With the AMS14C datings and wavelet analysis method, the climate periodic signal of Qinghai Lake, and its mechanism during the Holocene have been discussed. The results show that the environmental proxies of the lake basin are exist ~1000a, ~500a, ~250a quasi-cycles, and the ~1000a, ~500a cycle is obvious during the whole Holocene. 1000a quasi-cycle in the study area since the Holocene is mainly controlled by the solar radiation, 500a quasi-cycles is linked to the thermohaline circulation, and 250a quasi-cycle is related to the solar de Vries cycle.
Keywords: Qinghai Holocene climate change wavelet analysis Asian Southwest monsoon
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No.4675098100436014****
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