Indian monsoon variability on millennial-orbital timescales.
Indian monsoon variability on millennial-orbital timescales.
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印度季风在千年轨道时间尺度上的变化
DOI：
10.1038/srep24374
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发表时间：
2016-04-13
影响因子：
4.6
通讯作者：
Breitenbach SF
中科院分区：
文献类型：
--
作者：
Kathayat G;Cheng H;Sinha A;Spötl C;Edwards RL;Zhang H;Li X;Yi L;Ning Y;Cai Y;Lui WL;Breitenbach SF
印度夏季风（ISM）季风对生活在该地区的数十亿人至关重要。然而，在千禧年轨道时间尺度上，ISM的主要驱动因素仍存在重大争论。本文利用来自印度北部Bittoo洞穴的洞穴氧同位素（δ18O）数据重建了过去28万年的ISM变化。研究发现，东亚风域的北印度和中国洞穴δ18O记录具有较强的一致性，表明两个亚洲季风子系统对北半球夏季日照（NHSI）的变化表现出耦合响应，没有明显的时间滞后，支持了热带-亚热带季风变率直接受进动引起的NHSI变化驱动的观点。将北印度记录与南极冰芯和南印度洋末次冰期海表温度记录进行比较，并不表明南半球气候过程在千年轨道时间尺度上调节ISM变率方面起主导作用。
The Indian summer monsoon (ISM) monsoon is critical to billions of people living in the region. Yet, significant debates remain on primary ISM drivers on millennial-orbital timescales. Here, we use speleothem oxygen isotope (δ18O) data from Bittoo cave, Northern India to reconstruct ISM variability over the past 280,000 years. We find strong coherence between North Indian and Chinese speleothem δ18O records from the East Asian monsoon domain, suggesting that both Asian monsoon subsystems exhibit a coupled response to changes in Northern Hemisphere summer insolation (NHSI) without significant temporal lags, supporting the view that the tropical-subtropical monsoon variability is driven directly by precession-induced changes in NHSI. Comparisons of the North Indian record with both Antarctic ice core and sea-surface temperature records from the southern Indian Ocean over the last glacial period do not suggest a dominant role of Southern Hemisphere climate processes in regulating the ISM variability on millennial-orbital timescales.