DOI: 10.1016/j.gloplacha.2013.06.002
论文题名: Provenance and supply of Fe-enriched terrigenous sediments in the western equatorial Pacific and their relation to precipitation variations during the late Quaternary
作者: Wu J. ; Liu Z. ; Zhou C.
刊名: Global and Planetary Change
ISSN: 0921-8248
出版年: 2013
卷: 108 起始页码: 56
结束页码: 71
语种: 英语
英文关键词: Geochemistry
; Glacial-interglacial change
; Iron
; New Guinea Coastal Undercurrent
; Precession period
; Western equatorial Pacific
Scopus关键词: Equatorial Pacific
; Equatorial undercurrents
; Glacial-interglacial change
; Intertropical convergence zone
; New Guinea coastal undercurrent
; Precession period
; Precipitation variation
; Sea-level fluctuations
; Deposition
; Geochemistry
; Glacial geology
; Iron
; Sea level
; Sediments
; Electronic guidance systems
; carbon cycle
; eolian deposit
; geochemistry
; glacial-interglacial cycle
; glacier dynamics
; iron
; marine isotope stage
; precipitation (climatology)
; provenance
; Quaternary
; sea level change
; sediment transport
; terrigenous deposit
; undercurrent
; New Guinea
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: Iron (Fe) deposition in the equatorial Pacific has important implications for the global carbon cycle, while the provenance of Fe supply and its change remain highly debated. Here, we geochemically characterize the provenance of terrigenous sediments deposited on the pathways of the Equatorial Undercurrent (EUC) and the New Guinea Coastal Undercurrent (NGCUC). The Fe-enriched sediments in the western equatorial Pacific are mostly derived from fluvial inputs of Papua New Guinea (PNG), while nearly negligible impact from eolian dust could be detected. Variability of the terrigenous Fe-enriched deposition (7.4-13.4%) for core KX21-2 in the western equatorial Pacific over the past 380. ka shows dominant precession periods, superimposed on a clear glacial-interglacial trend with higher input during glacials. The precession periods are correlated with the precipitation over PNG, in response to the local summer insolation (5°S, March) and meridional migration of the Intertropical Convergence Zone (ITCZ). The glacial-interglacial trend is induced by sea level fluctuations that significantly influence the fluvial input from southern PNG. The different expressions of precession periods between glacials and interglacials in core KX21-2 are tightly associated with the undercurrent. The subdued precession periods during interglacials can be attributed to the weakness of the NGCUC, which may link to La Niña-like conditions. The enhanced precession periods during glacials should result from increased input from southern PNG on one hand, and an intensified NGCUC on the other hand, due to the El Niño-like conditions. Compared to Fe, the proxy ln (Ti/Total) (XRF log-ratio of Ti/Total counts) for core KX21-2 preferentially indicates the northern PNG input, and therefore could be used to reflect the glacial changes in the NGCUC. Our records imply that the NGCUC was particularly stronger in MIS 6 and 10, and weaker in MIS 8. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880364911&doi=10.1016%2fj.gloplacha.2013.06.002&partnerID=40&md5=c04c9833d46888a9c245ed1de1ef9bcf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11154
Appears in Collections: 全球变化的国际研究计划
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Recommended Citation:
Wu J.,Liu Z.,Zhou C.. Provenance and supply of Fe-enriched terrigenous sediments in the western equatorial Pacific and their relation to precipitation variations during the late Quaternary[J]. Global and Planetary Change,2013-01-01,108.