Decoupling of monsoon activity across the northern and southern Indo-Pacific during the Late Glacial
Decoupling of monsoon activity across the northern and southern Indo-Pacific during the Late Glacial
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冰川晚期印度-太平洋北部和南部季风活动的脱钩
DOI：
10.1016/j.quascirev.2017.09.014
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发表时间：
2017-11-15
影响因子：
4
通讯作者：
Lucker, S.
中科院分区：
文献类型：
--
作者：
Denniston, R. F.;Asmerom, Y.;Lucker, S.
最近对印度尼西亚南半球热带地区石笋的研究表明，季风活动的两个变化在南半球季风系统的北半球部分的记录中并不明显：在Heinrich Stadial 1之前的类似19 ka的降雨增强间隔，以及在类似9 ka的降水急剧增加。确定这些事件是特定地点的还是区域性的，对于理解南亚季风的全部敏感性是很重要的。本文报道了澳大利亚中北部热带地区金伯利地区两个洞穴石笋的不连续40凯尔碳同位素记录。海因里希退阶段由明显的负碳同位素异常,表明提高降雨与向南转移的热带辐合区和符合hydroclimatic变化观察到在亚洲和印支。然而，在20 - 8 ka之间，金伯利石笋与印度尼西亚的记录一样，揭示了季风行为与东南亚的脱钩，包括早期去冰湿期（我们称之为晚冰期雨期）和全新世早期季风降雨的突然加强。(C) 2017 Elsevier Ltd.版权所有。
Recent studies of stalagmites from the Southern Hemisphere tropics of Indonesia reveal two shifts in monsoon activity not apparent in records from the Northern Hemisphere sectors of the Austral-Asian monsoon system: an interval of enhanced rainfall at similar to 19 ka, immediately prior to Heinrich Stadial 1, and a sharp increase in precipitation at similar to 9 ka. Determining whether these events are site-specific or regional is important for understanding the full range of sensitivities of the Austral-Asian monsoon. We present a discontinuous 40 kyr carbon isotope record of stalagmites from two caves in the Kimberley region of the north-central Australian tropics. Heinrich stadials are represented by pronounced negative carbon isotopic anomalies, indicative of enhanced rainfall associated with a southward shift of the intertropical convergence zone and consistent with hydroclimatic changes observed across Asia and the Indo-Pacific. Between 20 and 8 ka, however, the Kimberley stalagmites, like the Indonesian record, reveal decoupling of monsoon behavior from Southeast Asia, including the early deglacial wet period (which we term the Late Glacial Pluvial) and the abrupt strengthening of early Holocene monsoon rainfall. (C) 2017 Elsevier Ltd. All rights reserved.