Planktic foraminiferal responses to orbital scale oceanographic changes off the western Iberian margin over the last 900 kyr: Results from IODP site U1391

doi:10.1016/j.gloplacha.2015.10.002

	Planktic foraminiferal responses to orbital scale oceanographic changes off the western Iberian margin over the last 900 kyr: Results from IODP site U1391
	Singh, A. D.1; Verma, K.1; Jaiswal, S.1; Alonso-Garcia, M.2,3; Li, B.4; Abrantes, F.2,3
刊名	GLOBAL AND PLANETARY CHANGE
	2015-12-01
卷号	135 页码:47-56
关键词	Planktic foraminifera Oceanography Glacial/interglacial Mid-Brunhes Event Western Iberian margin
ISSN号	0921-8181
DOI	10.1016/j.gloplacha.2015.10.002
英文摘要	This paper presents planktic foraminiferal assemblage records of the last 900 kyr from the SW Iberian margin (IODP Site 111391). The faunal records show the history of surface oceanographic changes on glacial/interglacial scales before and after the Mid-Brunhes Event (MBE), a period when a major shift in the climate pattern was recorded in other regions. Temporal variations in relative abundances of characteristic species/groups are used to infer changes in the latitudinal position of the polar/Arctic water (% Neogloboquadrina pachyderma sinistral and Turborotalita quinqueloba), influence of the transitional subpolar water mass (% N. pachyderma dextral), and subtropical water (% tropical/subtropical species/group). Past changes in the upwelling intensity and productivity pattern associated with seasonal trade wind strength are inferred from the abundance variations of Globigerina bulloides and G. bulloides + Globigerinita glutinata, respectively. Faunal data reveal the influence of cold water masses (polar/subpolar) at the examined site was more pronounced during glacial stages except for marine isotope stage (MIS) 14 and 16. The magnitude of the polar/subpolar water mass invading the study area was at maximum before the MBE during MIS 18, 20 and 22, resulting in a situation like the present day Arctic Front. Interglacial periods prior to the MBE were also relatively colder than those of the post-MBE. Our faunal based inferences are in agreement with the ice-rafted debris (IRD) concentration and N. pachyderma sinistral records of the subpolar North Atlantic sites. Based on faunal proxies, we recorded major and rapid changes in upwelling intensity and related productivity during glacial Terminations. Both the upwelling intensity and productivity significantly increased after the MBE, particularly during the interglacials MIS 7, 9 and 11. Our productivity record parallels the EPICA CH4 record suggesting teleconnections between trade winds induced productivity and the tropical climate through oceanic-atmospheric processes. (C) 2015 Elsevier B.V. All rights reserved.
资助项目	IODP-India ; National Centre for Antarctic and Ocean Research, MoES[NCAOR/IODP/17.7/10] ; FCT[SFRH/BPD/96960/2013]
WOS关键词	SUBPOLAR NORTH-ATLANTIC ; MIDPLEISTOCENE CLIMATE TRANSITION ; CANARY-ISLANDS REGION ; 2 GLACIAL PERIODS ; LONG-TERM CHANGES ; OCEAN CIRCULATION ; LATE PLEISTOCENE ; THERMOHALINE CIRCULATION ; VERTICAL-DISTRIBUTION ; SEASONAL SUCCESSION
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000370207600004
资助机构	IODP-India ; National Centre for Antarctic and Ocean Research, MoES ; FCT
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/21672]
专题	中国科学院南京地质古生物研究所
通讯作者	Singh, A. D.
作者单位	1.Banaras Hindu Univ, Ctr Adv Study Geol, Varanasi 221005, Uttar Pradesh, India 2.IPMA, P-1449006 Lisbon, Portugal 3.Univ Algarve, Ctr Ciencias Mar CCMAR, P-8005139 Faro, Portugal 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Singh, A. D.,Verma, K.,Jaiswal, S.,et al. Planktic foraminiferal responses to orbital scale oceanographic changes off the western Iberian margin over the last 900 kyr: Results from IODP site U1391[J]. GLOBAL AND PLANETARY CHANGE,2015,135:47-56.
APA	Singh, A. D.,Verma, K.,Jaiswal, S.,Alonso-Garcia, M.,Li, B.,&Abrantes, F..(2015).Planktic foraminiferal responses to orbital scale oceanographic changes off the western Iberian margin over the last 900 kyr: Results from IODP site U1391.GLOBAL AND PLANETARY CHANGE,135,47-56.
MLA	Singh, A. D.,et al."Planktic foraminiferal responses to orbital scale oceanographic changes off the western Iberian margin over the last 900 kyr: Results from IODP site U1391".GLOBAL AND PLANETARY CHANGE 135(2015):47-56.