气候变化领域集成服务门户(CCPortal): Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr

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DOI	10.1016/j.quascirev.2020.106465
	Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr
	Jia Q.; Li T.; Xiong Z.; Steinke S.; Algeo T.J.; Jiang F.; Chang F.; Qin B.
发表日期	2020
ISSN	0277-3791
卷号	244
英文摘要	Variations in thermoclinal conditions play an important role in the evolution of the Western Pacific Warm Pool (WPWP) and in connecting the tropical and extratropical regions of the Pacific Ocean. However, secular thermoclinal changes in the northwestern part of the WPWP and their forcing mechanisms are not yet well understood, particularly on orbital timescales. In this study, we report thermoclinal variation at Site MD06-3047 B in the western Philippine Sea over the last 700 kyr. Our data show that variations in thermocline temperature and salinity in the study area were correlated with changes in Earth's obliquity, with warmer and saltier (colder and fresher) thermocline waters corresponding to high (low) Earth-axial obliquity. At high obliquity, increases in thermocline temperature and salinity may have been linked to advection of warm North Pacific tropical water. In the study area, a lower (higher) vertical temperature gradient in the upper water column suggests a deeper (shallower) thermocline during glacials (interglacials). The main factor leading to thermoclinal deepening during glacials was strengthening of the East Asian winter monsoon (EAWM), and more La Niña-like conditions may have contributed to concurrent subsurface warming and thus thermoclinal deepening. In-phase thermoclinal deepening in the northern and peri-equatorial southern WPWP during glacial stages may have been triggered by changes in glacial boundary conditions, such as increased ice sheet thickness, through intensification of the EAWM and strengthening of the tropical Trade Winds. © 2020 Elsevier Ltd
英文关键词	Obliquity; Thermocline depth; Western pacific warm pool; Western philippine sea; WPWP; δ18O
语种	英语
scopus关键词	Glacial geology; Orbits; Tropics; East Asian winter monsoon; North pacific tropical waters; Philippine seas; Subsurface warming; Thermocline temperature; Upper water column; Vertical temperature gradients; Western Pacific Warm Pool; Stream flow; glacial-interglacial cycle; ice sheet; ice thickness; La Nina; salinity; seawater; temperature gradient; thermocline; warm pool; Pacific Ocean; Pacific Ocean (North); Philippine Sea
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151358
作者单位	First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, China; Department of Geological Oceanography and State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, United States; State Key Laboratories of Biogeology and Environmental Geology, and Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
推荐引用方式 GB/T 7714	Jia Q.,Li T.,Xiong Z.,et al. Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr[J],2020,244.
APA	Jia Q..,Li T..,Xiong Z..,Steinke S..,Algeo T.J..,...&Qin B..(2020).Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr.Quaternary Science Reviews,244.
MLA	Jia Q.,et al."Thermocline dynamics in the northwestern tropical Pacific over the past 700 kyr".Quaternary Science Reviews 244(2020).