Holocene temperature and precipitation variability on the central Tibetan Plateau revealed by multiple palaeo-climatic proxy records from an alpine wetland sequence

被引:20
作者
Cheung, Man-Ching [1 ]
Zong, Yongqiang [1 ]
Zheng, Zhuo [2 ]
Liu, Zhonghui [1 ]
Aitchison, Jonathan C. [3 ]
机构
[1] Univ Hong Kong HKU, Dept Earth Sci, James Lee Sci Bldg,Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
[2] Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou, Guangdong, Peoples R China
[3] Univ Queensland, Sch Earth & Environm Sci, St Lucia, Qld, Australia
基金
中国国家自然科学基金;
关键词
alpine wetland sediment; Asian monsoon; GDGTs; global ice volume; n-alkanes; organic carbon isotopes; Tibetan Plateau; Westerlies; NORTH-ATLANTIC CLIMATE; EAST-ASIAN MONSOON; TETRAETHER MEMBRANE-LIPIDS; INDIAN-SUMMER MONSOON; BASIN WESTERN TIBET; HIGH-RESOLUTION; POLLEN RECORD; CENTRAL CHINA; LAKE QINGHAI; PALEOCLIMATIC CHANGES;
D O I
10.1177/0959683617702225
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
This study has reconstructed the Holocene environmental history of central Tibetan Plateau, a transitional area between monsoon-dominated Asia and Westerlies-dominated Asia, to examine the interplay between the two circulation systems and effects of other potential mechanisms on the temporal variability of Holocene climatic conditions in the study area. Specifically, this study has produced a twin record of palaeo-hydrology and palaeo-temperature from an alpine wetland sediment sequence using two sets of lipid-based biomarker indices: n-alkanes and branched glycerol dialkyl glycerol tetraethers (bGDGTs). The results show that (1) the Asian summer monsoon has supplied moisture that helped initiate the wetland habitat around 8000 cal. yr BP, about 2000 years later than locations along the southeastern edge of the plateau; (2) a significant decline in moisture supply is evident since the Medieval Warm period; (3) the Westerlies have transmitted variability of the North Atlantic climate to the study area, resulting in periodic increases in evaporation and causing short-term expansion or contraction of the wetland and (4) the palaeo-air temperature change follows closely that of global sea level and sea surface temperature, implying a link to global ice volume change throughout the Holocene. This study concludes that the Holocene climate history of central Tibetan Plateau is a result of monsoonal moisture supply interacted with the Westerlies variability, while the palaeo-temperature has followed changes in global ice volume during the present warm interglacial.
引用
收藏
页码:1669 / 1681
页数:13
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