Climate evolution of southwest Australia in the Miocene and its main controlling factors

doi:10.1007/s11430-021-9904-y

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Climate evolution of southwest Australia in the Miocene and its main controlling factors
	Sun, Tianqi 1,4,5; Xu, Zhaokai 3,4,5,6; Chang, Fengming 3,4,5; Li, Tiegang 1,2,5
刊名	SCIENCE CHINA-EARTH SCIENCES
	2022-04-22
页码	12
关键词	Miocene Southwest Australia Climate evolution Controlling factors International ocean discovery program
ISSN号	1674-7313
DOI	10.1007/s11430-021-9904-y
通讯作者	Xu, Zhaokai(zhaokaixu@qdio.ac.cn) ; Li, Tiegang(tgli@fio.org.cn)
英文摘要	At present, the seasonal melting and expansion of the Antarctic ice sheet affect the location and intensification of the westerlies, as well as the precipitation and continental weathering and erosion in southwest Australia. The Miocene was an important period when the Earth's climate state transitioned from a warmhouse to an icehouse and the East Antarctic Ice Sheet underwent large-scale melting and expansion. At that time, Australia was closer to the Antarctic region than it is now. This makes Australia an ideal target area for studying the coupling relationship among the atmosphere, hydrosphere, lithosphere, and cryosphere. Based on the comprehensive analysis of the siliciclastic mass accumulation rate, grain size, clay minerals, and elemental composition of the sediments at Site U1516 of the International Ocean Discovery Program Expedition 369, we reconstructed the Miocene climate evolution and the continental weathering and erosion history of southwest Australia on a tectonic time scale. Our indicators show that the climate was dry and that continental weathering and erosion were weak, with a small amount of terrestrial material transported to the ocean during the Early to Middle Miocene (22-12.7 Ma). However, as mentioned in previous studies of nearby sites, precipitation and river runoff increased prominently with enhanced continental weathering at 12.7-8 Ma, which was related to the northward migration or intensification of the westerlies, possibly due to increased sea ice in the Southern Ocean. In addition, we found that the evolution of the South Asian monsoon and the westerly belt were synchronized in the Miocene, which indicates that the South Asian monsoon system at that time may also have been affected by the high-latitude signals of the Southern Hemisphere. We speculate that the significant decrease in deep-sea temperature and the expansion of the surface sea temperature gradient in latitude and longitude until the permanent East Antarctic Ice Sheet formed (similar to 12.8 Ma) played an important role in the transmission of Antarctic signals to low latitudes.
资助项目	Key Laboratory of Marine Geology and Environment of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB40010100] ; National Natural Science Foundation of China[41876034] ; National Natural Science Foundation of China[41676038]
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000787661100001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/178900]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Xu, Zhaokai; Li, Tiegang
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.MNR, Inst Oceanog 1, Key Lab Marine Sedimentol & Metallogeny, Qingdao 266061, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 5.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol, Qingdao 266061, Peoples R China 6.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Sun, Tianqi,Xu, Zhaokai,Chang, Fengming,et al. Climate evolution of southwest Australia in the Miocene and its main controlling factors[J]. SCIENCE CHINA-EARTH SCIENCES,2022:12.
APA	Sun, Tianqi,Xu, Zhaokai,Chang, Fengming,&Li, Tiegang.(2022).Climate evolution of southwest Australia in the Miocene and its main controlling factors.SCIENCE CHINA-EARTH SCIENCES,12.
MLA	Sun, Tianqi,et al."Climate evolution of southwest Australia in the Miocene and its main controlling factors".SCIENCE CHINA-EARTH SCIENCES (2022):12.