A two million year record of low-latitude aridity linked to continental weathering from the Maldives

doi:10.1186/s40645-018-0238-x

	A two million year record of low-latitude aridity linked to continental weathering from the Maldives
	Kunkelova, Tereza 1; Jung, Simon J. A.1; de Leau, Erica S.1; Odling, Nick 1; Thomas, Alex L.1; Betzler, Christian 2; Eberli, Gregor P.3; Alvarez-Zarikian, Carlos A.4; Alonso-Garcia, Montserrat 5,6; Bialik, Or M.7
刊名	PROGRESS IN EARTH AND PLANETARY SCIENCE
	2018-12-18
卷号	5
关键词	Maldives IODP Exp 359 Non-destructive core scanning Composition of lithogenic fraction Orbital cycles Indian-Asian history of aridity Mid Pleistocene transition
ISSN号	2197-4284
DOI	10.1186/s40645-018-0238-x
英文摘要	Indian-Asian monsoon has oscillated between warm/wet interglacial periods and cool/dry glacial periods with periodicities closely linked to variations in Earth's orbital parameters. However, processes that control wet versus dry, i.e. aridity cyclical periods on the orbital time-scale in the low latitudes of the Indian-Asian continent remain poorly understood because records over millions of years are scarce. The sedimentary record from International Ocean Discovery Program (IODP) Expedition 359 provides a well-preserved, high-resolution, continuous archive of lithogenic input from the Maldives reflecting on low-latitude aridity cycles. Variability within the lithogenic component of sedimentary deposits of the Maldives results from changes in monsoon-controlled sedimentary sources. Here, we present X-ray fluorescence (XRF) core-scanning results from IODP Site U1467 for the past two million years, allowing full investigation of orbital periodicities. We specifically use the Fe/K as a terrestrial climate proxy reflecting on wet versus dry conditions in the source areas of the Indian-Asian landmass, or from further afield. The Fe/K record shows orbitally forced cycles reflecting on changes in the relative importance of aeolian (stronger winter monsoon) during glacial periods versus fluvial supply (stronger summer monsoon) during interglacial periods. For our chronology, we tuned the Fe/Kcycles to precessional insolation changes, linking Fe/K maxima/minima to insolation minima/maxima with zero phase lag. Wavelet and spectral analyses of the Fe/K record show increased dominance of the 100kyr cycles after the Mid Pleistocene Transition (MPT) at 1.25Ma in tandem with the global ice volume benthic O-18 data (LR04 record). In contrast to the LR04 record, the Fe/K profile resolves 100-kyr-like cycles around the 130kyr frequency band in the interval from 1.25 to 2 million years. These 100-kyr-like cycles likely form by bundling of two or three obliquity cycles, indicating that low-latitude Indian-Asian climate variability reflects on increased tilt sensitivity to regional eccentricity insolation changes (pacing tilt cycles) prior to the MPT. The implication of appearance of the 100kyr cycles in the LR04 and the Fe/K records since the MPT suggests strengthening of a climate link between the low and high latitudes during this period of climate transition.
资助项目	Portuguese National Science and Technology Foundation[SFRH/BPD/96960/2013] ; Portuguese National Science and Technology Foundation[PTDC/MAR-PRO/3396/2014] ; Portuguese National Science and Technology Foundation[UID/Multi/04326/2013]
WOS关键词	ELEMENT ANALYSIS ; MONSOON ; TEMPERATURE ; ATLANTIC ; ONSET
WOS研究方向	Geology
语种	英语
出版者	SPRINGEROPEN
WOS记录号	WOS:000453823300001
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25024]
专题	自然资源部第一海洋研究所
通讯作者	Kroon, Dick
作者单位	1.Univ Edinburgh, Grant Inst, Sch GeoSci, Kings Bldg,West Mains Rd, Edinburgh EH9 3JW, Midlothian, Scotland 2.Univ Hamburg, Inst Geol, CFN, Bundesstr 55, D-20146 Hamburg, Germany 3.Univ Miami, Sch Marine & Atmospher Sci, Dept Marine Geosci, Miami, FL 33149 USA 4.Texas A&M Univ, Int Ocean Discovery Program, Discovery Dr, College Stn, TX 77845 USA 5.IPMA, Div Geol Georecursos Marinhos, Rua Alfredo Magalhaes Ramalhoi 6, P-1495006 Lisbon, Portugal 6.Univ Algarve, Ctr Ciencias Mar CCMAR, Faro, Portugal 7.Univ Haifa, Dr Moses Strauss Dept Marine Geosci, Leon H Charney Sch Marine Sci, IL-31905 Haifa, Israel 8.Princeton Univ, Dept Geosci, Guyot Hall, Princeton, NJ 08544 USA 9.Calif State Univ Bakersfield, Dept Geol Sci, 9001 Stockdale Highway, Bakersfield, CA 93311 USA 10.Univ Lorraine, Ecole Natl Super Geol, 2 Rue Doyen Marcel Roubault, F-54501 Vandoeuvre Les Nancy, France
推荐引用方式 GB/T 7714	Kunkelova, Tereza,Jung, Simon J. A.,de Leau, Erica S.,et al. A two million year record of low-latitude aridity linked to continental weathering from the Maldives[J]. PROGRESS IN EARTH AND PLANETARY SCIENCE,2018,5.
APA	Kunkelova, Tereza.,Jung, Simon J. A..,de Leau, Erica S..,Odling, Nick.,Thomas, Alex L..,...&Kroon, Dick.(2018).A two million year record of low-latitude aridity linked to continental weathering from the Maldives.PROGRESS IN EARTH AND PLANETARY SCIENCE,5.
MLA	Kunkelova, Tereza,et al."A two million year record of low-latitude aridity linked to continental weathering from the Maldives".PROGRESS IN EARTH AND PLANETARY SCIENCE 5(2018).