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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Late Miocene-Pliocene Asian summer monsoon variability linked to both tropical Pacific temperature and Walker Circulation
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Late Miocene-Pliocene Asian summer monsoon variability linked to both tropical Pacific temperature and Walker Circulation

机译：晚期内科 - 全世界亚洲夏季季风变异与热带太平洋温度和助行器循环有关

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The Pliocene climate, characterized by sustained global warmth and weakened Walker Circulation, might be a potential analogue of our future climate. How Asian Summer Monsoon (ASM) evolved over this period and its controlling mechanisms remain controversial, which limits our understanding of future monsoon behavior. Here, we present alkenone- and GDGT-based records reconstructed from the northern coast of the South China Sea, interpreted to document the strength of ASM-induced upwelling/mixing effect, to infer Late Miocene-Pliocene ASM variability. Cooler local sea surface temperatures occurred between similar to 5.6 million years ago (Ma) and 4.3 Ma, corresponding to Pliocene warmer conditions, effectively capturing the cooling signal induced by summer upwelling. Our multiple biomarker records consistently indicate three phases of Late Miocene-Pliocene ASM evolution: weak ASM strength at similar to 6.5-5.6 Ma, substantially enhanced strength at 5.6-4.3 Ma, and reduced strength but with a slightly strengthening trend after similar to 4.3 Ma. The three features have been reported collectively from previous terrestrial and marine records. The close correspondence of the ASM strength to tropical temperature before similar to 4.3 Ma suggests a dominant tropical temperature control, whereas the increasing ASM strength after that, opposite to temperature changes, implies that the developed Walker Circulation started to influence ASM strength over the Late Pliocene. Hence, tropical temperature and Walker Circulation appear to have exerted competing roles in the Late Miocene-Pliocene ASM evolution. (C) 2021 Elsevier B.V. All rights reserved.
机译：以全球持续变暖和沃克环流减弱为特征的上新世气候可能与我们未来的气候类似。亚洲夏季风（ASM）在这一时期的演变及其控制机制仍然存在争议，这限制了我们对未来季风行为的理解。在这里，我们展示了从南海北部海岸重建的基于烯酮和GDGT的记录，解释为记录ASM诱导的上升流/混合效应的强度，以推断中新世晚期上新世ASM的变异性。较冷的局部海面温度出现在560万年前（Ma）和4.3 Ma之间，与上新世的温暖条件相对应，有效地捕捉了夏季上升流引起的冷却信号。我们的多个生物标志物记录一致表明晚中新世-上新世ASM演化的三个阶段：类似于6.5-5.6 Ma的弱ASM强度，5.6-4.3 Ma的强度显著增强，以及类似于4.3 Ma后强度降低但略有增强的趋势。这三个特征是从以前的陆地和海洋记录中集体报告的。ASM强度与4.3 Ma之前热带温度的密切对应表明，热带温度控制占主导地位，而与温度变化相反，之后ASM强度的增加意味着发达的Walker环流在上新世晚期开始影响ASM强度。因此，热带温度和沃克环流似乎在中新世晚期上新世ASM演化中发挥了相互竞争的作用。（c）2021爱思唯尔B.V.保留所有权利。

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