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首页> 外文期刊>Climate of the Past Discussions >Variability of the Asian summer monsoon during the penultimate glacial/interglacial period inferred from stalagmite oxygen isotope records from Yangkou cave, Chongqing, Southwestern China
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Variability of the Asian summer monsoon during the penultimate glacial/interglacial period inferred from stalagmite oxygen isotope records from Yangkou cave, Chongqing, Southwestern China

机译：根据重庆市阳口洞石笋氧同位素记录推断的倒数第二个冰期/间冰期亚洲夏季风的变化

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摘要

The orbital-timescale dynamics of the Quaternary Asian summer monsoons (ASM) are frequently attributed to precession-dominated Northern Hemisphere summer insolation. However, this ASM variability is inferred primarily from oxygen isotope records of stalagmites, mainly from Sanbao cave in mainland China, and may not provide a comprehensive picture of ASM evolution. A new spliced stalagmite oxygen isotope record from Yangkou cave tracks summer monsoon precipitation variation from 124–206 thousand years ago in Chongqing, southwest China. When superimposed on the Sanbao record, the Yangkou-inferred precipitation time series is shown to support the strong ASM periods at marine isotope stages (MIS) 6.3, 6.5, and 7.1 and weak ASM intervals at MIS 6.2, 6.4, and 7.0. This consistency confirms that ASM events affected most of mainland China. We show that change in glacial/interglacial (G/IG) ASM intensity was also governed by the Walker Circulation by combining our results with published paleo-Pacific thermal and salinity records. One of the strongest ASM events over the past fiver G/IG cycles, at MIS 6.5, was enhanced by such zonal forcing associated with prevailing trade winds in the Pacific.
机译：亚洲第四纪季风（ASM）的轨道-时标动力学经常归因于以旋进为主的北半球夏季日射。但是，这种ASM的变化主要是由石笋的氧同位素记录（主要是中国大陆的三宝洞）推断的，可能无法提供ASM演化的全面情况。羊口洞的一个新的拼接石笋氧同位素记录追踪了中国西南重庆地区124－20.6万年前的夏季风降水变化。当叠加在三宝记录上时，表明洋口推断的降水时间序列支持海洋同位素阶段（MIS）6.3、6.5和7.1的强ASM周期，以及MIS 6.2、6.4和7.0的弱ASM间隔。这种一致性证实了ASM事件影响了中国大部分地区。我们通过将我们的结果与已发布的古太平洋热和盐度记录相结合，显示了冰川/冰川间（G / IG）ASM强度的变化也受沃克环流控制。在过去的五个G / IG周期中，MIS 6.5是最强的ASM事件之一，这是由于与太平洋盛行的贸易风相关的区域强迫而增强的。

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