干旱区生态环境知识资源中心(Arid): Mid-Holocene deepening of the Southeast Pacific oxycline

Arid

DOI	10.1016/j.gloplacha.2018.10.020
	Mid-Holocene deepening of the Southeast Pacific oxycline
	Mollier-Vogel, Elfi 1; Martinez, Philippe 2; Blanz, Thomas 1; Robinson, Rebecca 3; Desprat, Stephanie 2,4; Etourneau, Johan 5; Charlier, Karine 2; Schneider, Ralph R.1
通讯作者	Martinez, Philippe
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2019
卷号	172 页码:365-373
英文摘要	This study presents new high resolution sedimentary delta N-15 records from piston cores collected within and outside the present-day eastern south Pacific oxygen minimum zone along a latitudinal transect from 3.5 degrees S to 15 degrees S. Radiocarbon dating of foraminifera and organic matter show that the cores cover the Holocene and the last deglaciation with high sedimentation rate allowing interpretations at millennial to centennial timescale. High delta N-15 values, reaching 10 parts per thousand and large amplitude changes, with a magnitude of similar to 4 parts per thousand, are observed in the southern part of the studied area during the last 18 ka BP. In contrast, the northern Peruvian cores located on the edge of the OMZ show low delta N-15 values varying from 4 to 6 parts per thousand with amplitude of only 1 parts per thousand, during the same time period. delta N-15 values decrease in all the studied cores from the last deglaciation to the early Holocene (17 to 8.5 ka BP) and reach a minimum value during the mid-Holocene. The delta N-15 variations are attributed to microbial N-loss to N-2, e.g. denitrification and/or anammox, and the characteristic N-15-enriched signal that is recorded in the underlying sediments under suboxic to anoxic conditions where denitrifiers thrive. Surprisingly, delta N-15 values from cores located within the OMZ show similar values as the more northern cores located outside the OMZ between 5 and 8.5 ka BP. This minimum is not related to local changes in export production, reconstructed from sedimentary organic carbon, total nitrogen and bromine, but appears to be controlled by changes in the ventilation of the area. The low delta N-15 values recorded between 8.5 and 5 ka BP are well correlated with more arid conditions developed along the Peruvian margin and an increase of the sea surface temperature gradient along the Peruvian margin and between the West and East Pacific along the equator, implying an intensification of the Hadley circulation and climatic conditions similar to La Nina-like state. Consequently, these mid-Holocene conditions led to greater ventilation of subsurface waters that deepened the Peruvian oxycline then revealing similar conditions as observed today in the northern part of the study area.
英文关键词	Oxygen minimum zone Peruvian margin Holocene ENSO Nitrogen isotopes
类型	Article
语种	英语
国家	Germany ; France ; USA ; Spain
收录类别	SCI-E
WOS记录号	WOS:000456222800027
WOS关键词	EASTERN TROPICAL PACIFIC ; OXYGEN MINIMUM ZONE ; NUTRIENT UTILIZATION ; UPWELLING SYSTEM ; HOLOCENE CHANGES ; ATMOSPHERIC N2O ; EL-NINO ; PERU ; PRODUCTIVITY ; VARIABILITY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216061
作者单位	1.Christian Albrechts Univ Kiel, Inst Geowissensch, Kiel, Germany; 2.Univ Bordeaux, CNRS, UMR 5805, EPOC, Pessac, France; 3.Univ Rhode Isl, Grad Sch Oceanog, Narrangasett, RI USA; 4.PSL Res Univ, EPHE, Pessac, France; 5.CSIC, Inst Andaluz Ciencias Tierra, Granada, Spain
推荐引用方式 GB/T 7714	Mollier-Vogel, Elfi,Martinez, Philippe,Blanz, Thomas,et al. Mid-Holocene deepening of the Southeast Pacific oxycline[J],2019,172:365-373.
APA	Mollier-Vogel, Elfi.,Martinez, Philippe.,Blanz, Thomas.,Robinson, Rebecca.,Desprat, Stephanie.,...&Schneider, Ralph R..(2019).Mid-Holocene deepening of the Southeast Pacific oxycline.GLOBAL AND PLANETARY CHANGE,172,365-373.
MLA	Mollier-Vogel, Elfi,et al."Mid-Holocene deepening of the Southeast Pacific oxycline".GLOBAL AND PLANETARY CHANGE 172(2019):365-373.