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首页> 外文期刊>Journal of Asian earth sciences >Lacustrine lignin biomarker record reveals a severe drought during the late Younger Dryas in southern Taiwan
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Lacustrine lignin biomarker record reveals a severe drought during the late Younger Dryas in southern Taiwan

机译：Lacustrine木质素生物标志物记录显示台湾南部Younger Dryas晚期严重干旱

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The Younger Dryas (YD) event, which punctuated the last glacial-Holocene transition period and had a profound impact on global climate, is the most well studied millennial-scale climate event although the triggering mechanism remains debate. Weakened Asian summer monsoon during the YD is recorded in oxygen isotopes of stalagmite from Mainland China. However, lacustrine climate record of the YD event has not been reported from the subtropical land-ocean boundary of the Asian continent near the Pacific warm pool. We provide a lignin biomarker record covering the last deglaciation and early Holocene (17-9 ka BP) from the Dongyuan Lake, southern Taiwan, located at the frontal zone of typhoon invasion. The lignin phenol ratio S/V shows that the vegetation in the catchments had shifted from gymnosperm dominant to angiosperm dominant plants since 12.2 ka BP. Significantly decreased lignin concentrations (TLP and lambda(8)) and elevated lignin degradation parameters ((Ad/A1)v, P/(V + S), DHBA/V) in combination with other organic proxies (TOC, delta 13Corg) during the late YD suggest a severe drought had occurred in southern Taiwan during this specific period. Changes in the lignin proxies from the Dongyuan Lake lagged the climate changes registered in stalagmite records by around 500-800 years, suggesting a slow response of vegetation and soil processes to rapid climate changes. (c) 2017 Elsevier Ltd. All rights reserved.
机译：尽管触发机制仍存在争议，但最年轻的千禧年规模气候事件是始于最后一个冰川-全新世过渡时期的事件，对全球气候产生了深远影响。 YD期间亚洲夏季风减弱，记录在来自中国大陆的石笋的氧同位素中。然而，尚未从太平洋暖池附近亚洲大陆的亚热带陆地-海洋边界报告YD事件的湖面气候记录。我们提供了木质素生物标志物记录，涵盖了台湾南部位于台风侵袭前缘的东源湖的最后一次冰消和全新世（17-9 ka BP）。木质素酚比S / V表明，自12.2 ka BP以来，流域的植被已从裸子植物优势植物转变为被子植物优势植物。与其他有机代理（TOC，δ13Corg）结合使用时，木质素浓度（TLP和lambda（8））显着降低，木质素降解参数（（Ad / A1）v，P /（V + S），DHBA / V）升高。年初至今表明台湾在此特定时期发生了严重的干旱。东源湖木质素代理的变化落后石笋记录中记录的气候变化约500-800年，表明植被和土壤过程对快速气候变化的响应较慢。 （c）2017 Elsevier Ltd.保留所有权利。

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