期刊
HOLOCENE
卷 28, 期 5, 页码 755-766出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0959683617744267
关键词
early Holocene; hydrogen isotope; Indian summer monsoon; Linggo Co; oxygen isotope; Tibetan Plateau
资金
- 'Strategic Priority Research Program (B)' of the Chinese Academy of Sciences [XDB01020300]
- Natural Science Foundation of China Key project [41230523]
- PhD early development program of Hebei GEO University [BQ2017018, BQ2017050]
- China Scholarships Council [201406410006]
The spatial and temporal variability, effects, and mechanisms of the Indian Summer Monsoon (ISM) have been investigated intensively during the past few decades. The pattern of a relatively strong ISM during the early to middle Holocene, and a relatively weak ISM in the late Holocene, has been widely demonstrated in both marine and continental records. However, the timing of the ISM onset during the early Holocene remains controversial. Here, we present oxygen isotope record from ostracods and hydrogen isotope record from sedimentary leaf waxes from a sediment core at Linggo Co, a glacier-fed lake on the central Tibetan Plateau, in order to investigate the onset of the ISM. The ostracod O-18 record indicates an early ISM onset at similar to 11.7 ka, whereas the leaf wax D record indicates a later ISM onset at similar to 10 ka. This apparent two-step development of the ISM revealed by aquatic and terrestrial records is confirmed by principal component analysis of nine marine records from the ISM domain. The comparison between isotope records from Linggo Co and the marine records implies that the early ISM onset was likely linked to elevated temperatures in the Northern Hemisphere, while the later ISM onset may be related to intensified precipitation.
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