A high-resolved record of the Asian Summer Monsoon from Dongge Cave, China for the past 1200 years

A high-resolved record of the Asian Summer Monsoon from Dongge Cave, China for the past 1200 years
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中国东阁洞近1200年来亚洲夏季风的高分辨率记录

DOI:
10.1016/j.quascirev.2015.05.030
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发表时间:
2015-08
影响因子:
4
通讯作者:
Xinggong Kong
Xinggong Kong
中科院分区:
地球科学1区
文献类型:
--
作者:
R. Lawrence Edwards;Hai Cheng;Dianbing Liu;Xinggong Kong

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东阁洞石笋氧同位素(δ 18 O)记录的两个年层积和230 Th定年记录,提供了过去1200年高分辨率的亚洲夏季风(ASM)历史。年条带厚度和稳定同位素分析(δ 13 C和δ 18 O)之间的密切相似性表明方解石δ 18 O最有可能是与ASM降水相关的代理。两个石笋δ ~(18)O记录的重复表明,ASM的变化周期约为1.220年,与太阳活动的一个主要周期相一致。在Spörer极小期(1450-1550 A.D.)期间出现了一段强烈的ASM活动,随后在公元1580年左右急剧下降这可能与中国明朝(公元1368-1644年)最后几十年的社会动荡相一致。在过去的一千年中,ASM降水的百年尺度变化与热带大西洋海面温度(SST)和南美夏季季风降水的变化很好地吻合。我们的研究结果表明,低纬度季风降水的变化可能是由热带辐合区(ITCZ)的平均位置的变化,这是进一步介导的太阳活动和热带SST。
Two annually-laminated and230Th-dated stalagmite oxygen isotope (δ18O) records from Dongge Cave, China, provided a high-resolution Asian Summer Monsoon (ASM) history for the past 1200 years. A close similarity between annual band thickness and stable isotope analyses (δ13C and δ18O) suggests the calcite δ18O is most likely a proxy associated with ASM precipitation. The two duplicated stalagmite δ18O records show that the ASM varies at a periodicity of ∼220 years, concordant with a dominant cycle of solar activity. A period of strong ASM activity occurred during the Spörer Minimum (1450–1550 A.D.), followed by a striking drop circa 1580 A.D., potentially consistent with the social unrest in the final decades of China's Ming Dynasty (1368–1644 A.D.). Centennial-scale changes in ASM precipitation over the last millennium match well with changes in tropical Atlantic sea surface temperatures (SSTs) and South American summer monsoon precipitation. Our findings suggest that variations in low-latitude monsoon precipitation are probably driven by shifts in the mean position of the intertropical convergence zone (ITCZ), which is further mediated by solar activity and tropical SSTs.
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