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DOI	10.1016/j.palaeo.2018.11.040
	Indian Summer Monsoon variations and competing influences between hemispheres since ~35 ka recorded in Tengchongqinghai Lake; southwestern China
	Peng J.; Yang X.; Toney J.L.; Ruan J.; Li G.; Zhou Q.; Gao H.; Xie Y.; Chen Q.; Zhang T.
发表日期	2019
ISSN	0031-0182
起始页码	113
结束页码	125
卷号	516
英文摘要	The southwestern Yunnan Province of China, which is located at the southeastern margin of the Tibetan Plateau and close to Bay of Bengal, is significantly influenced by the Indian Summer Monsoon (ISM). In this study, we reconstruct proxies for the ISM from 35 to 1 ka through detailed analysis of grain-size distribution, geochemical composition and environmental magnetism from a 7.96 m sediment core from Tengchongqinghai Lake, Yunnan Province, China. Globally recognized, abrupt climatic events, including Heinrich Events 0–3 (H0−H3) and the Bølling-Allerød (B/A) warm period are identified in most of our proxies, and the long-term trend is consistent with other published records such as stalagmite oxygen isotopes (δ18O) from Sangxing Cave. Northern Hemisphere (NH) temperature, which is influenced by NH solar insolation, is commonly suggested to play a dominant role in controlling the ISM. A comparison of our record with the δ18O variations of ice cores from Greenland and Antarctica, a sea surface temperature (SST) record from the Bay of Bengal, and summer solar insolation at 25°N latitude demonstrates that the general pattern of ISM change does follow variations in summer insolation; however, the ISM lags summer insolation by thousands of years. While the ISM fluctuations are highly correlated with NH temperature on shorter timescales (centennial-millennial), the gradually weakened ISM from 22.5 ka until the Last Glacial Maximum (LGM) indicates a close relationship with the rise of Southern Hemisphere (SH) temperature and the relatively cold background of the SH. Our record expands on the findings of ISM records from Heqing paleolake basin in southwestern China and the Arabian Sea sediments, suggesting that the NH and SH have a competitive influence on ISM by controlling the cross-equatorial pressure gradient. This relationship means that when NH temperatures are relatively high, it has a stronger influence on the ISM than SH influences. In contrast, when the SH temperature is relatively low, it has a dominant influence on ISM. In addition, we speculate that the change of SH temperature not only influences the cross-equatorial pressure gradient directly, but also likely modulates the circulation system of ocean energy by influencing the Atlantic Meridional Overturning Circulation (AMOC). © 2018 Elsevier B.V.
英文关键词	Chemical weathering; Indian Monsoon; Lacustrine sediment; Lake level; Southern Hemisphere
语种	英语
scopus关键词	chemical weathering; ice core; insolation; lacustrine deposit; lake level; Last Glacial Maximum; marine sediment; monsoon; Northern Hemisphere; oceanic circulation; overturn; paleoclimate; paleoenvironment; pressure gradient; sea surface temperature; sediment core; Southern Hemisphere; summer; timescale; Antarctica; Arabian Sea; Arctic; Bay of Bengal; China; Greenland; Heqing Lake; Indian Ocean; Qinghai-Xizang Plateau; Yunnan
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151106
作者单位	School of Earth Science and Engineering/Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, Sun Yat-sen University, Guangzhou, 510275, China; Geographical & Earth Sciences, University of Glasgow, United Kingdom
推荐引用方式 GB/T 7714	Peng J.,Yang X.,Toney J.L.,等. Indian Summer Monsoon variations and competing influences between hemispheres since ~35 ka recorded in Tengchongqinghai Lake; southwestern China[J],2019,516.
APA	Peng J..,Yang X..,Toney J.L..,Ruan J..,Li G..,...&Zhang T..(2019).Indian Summer Monsoon variations and competing influences between hemispheres since ~35 ka recorded in Tengchongqinghai Lake; southwestern China.Palaeogeography, Palaeoclimatology, Palaeoecology,516.
MLA	Peng J.,et al."Indian Summer Monsoon variations and competing influences between hemispheres since ~35 ka recorded in Tengchongqinghai Lake; southwestern China".Palaeogeography, Palaeoclimatology, Palaeoecology 516(2019).