Intermediate water circulation in the mid-latitude Northeast Atlantic over the past 13,000 years: Multi-proxy evidence from IODP Site U1391

doi:10.1016/j.palaeo.2024.112428

NIGPAS OpenIR

	Intermediate water circulation in the mid-latitude Northeast Atlantic over the past 13,000 years: Multi-proxy evidence from IODP Site U1391
通讯作者	Guo, Qimei([email protected]) ; Li, Baohua([email protected])
	Guo, Qimei1 ; Li, Baohua1,2 ; Cai, Yue 1
	2024-11-15
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	654 页码:17
摘要	The Antarctic Intermediate Water (AAIW) is an important contributor to the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), redistributing heat, salinity, nutrients, and carbon in the Atlantic Ocean. The Mediterranean Outflow Water (MOW) transports heat and salt into the northern high-latitude Atlantic, thus playing an important role in driving the AMOC. However, the northward extent of AAIW in the Atlantic during the last deglaciation remains controversial and the Holocene variability of MOW is not well understood. In the modern east Atlantic Ocean, the northern boundary of AAIW meets the southern boundary of MOW off southern Iberia, which makes the Iberian margin an ideal region to unravel whether AAIW penetrated to the North Atlantic during the last deglaciation and the MOW dynamics during the Holocene. We present benthic foraminiferal Ba/Ca, Cd/Ca and Mg/Ca ratios, delta 13 C offsets between Planulina ariminensis and Globobulimina spp., and benthic foraminiferal faunal records of IODP Site U1391 drilled in the intermediate-depth Atlantic off the southwestern Iberian margin. The dominance of the Cassidulina neoteretis-Nonionella turgida assemblage, combined with low Delta 13 C P . ariminensis-Globobulimina spp. offsets, high Ba/Ca and Cd/Ca ratios and low Mg/Ca ratios during the Younger Dryas (YD), indicates the presence of AAIW in the mid-latitude North Atlantic intermediate waters. Going into the Holocene, the Cassidulina neoteretis- Nonionella turgida assemblage was shifted to the Melonis affinis - Bulimina marginata assemblage, accompanied by frequent occurrences of the MOW indicator Planulina ariminensis, , which suggests that Site U1391 was mainly bathed by MOW. During the middle Holocene ( 9.4-6.0 ka), the relative abundance of P. ariminensis and Ba/Ca ratios decreased significantly, and the proportions of oxic species Osangularia culter, , Bulimina alazanensis and Cibicidoides pachyderma increased, which were likely attributed to the influence of large volumes of oxygen-enriched North Atlantic Central Water. Between 6.0 ka and 3.6 ka, an increase in the relative abundance of P. ariminensis and Ba/Ca ratios, and a decrease in the relative abundance of O. culter assemblage suggest intensified MOW at Site U1391. However, from 3.6 ka onward MOW weakened at the study site, as evidenced by a distinct decrease in the proportion of P. ariminensis and Ba/Ca ratios. The long-term trend of MOW variations over the past 13 kyrs shows that the weakening of MOW dynamics at Site U1391 is related to the prevailing dry climates in the Mediterranean region, which is also reflected in its millennial-scale variations. Benthic Ba/Ca, Cd/Ca and Mg/Ca records exhibit high-frequency oscillations centred on periods of 1.8 kyrs. Lower Ba/Ca, Cd/Ca and Mg/Ca ratios suggest a weak MOW signal at Site U1391, concurrent with the Bond events during the Holocene.
关键词	Antarctic Intermediate Water Mediterranean Outflow Water Younger Dryas Holocene climate change Iberian margin
DOI	10.1016/j.palaeo.2024.112428
收录类别	SCI
语种	英语
关键词[WOS]	MEDITERRANEAN OUTFLOW WATER ; SEA BENTHIC FORAMINIFERA ; CASSIDULINA-TERETIS TAPPAN ; HIGH-RESOLUTION RECORD ; DEEP-SEA ; SOUTH ATLANTIC ; COMMUNITY STRUCTURE ; MG/CA-PALEOTHERMOMETRY ; ISOTOPIC COMPOSITION ; OCEAN CIRCULATION
资助项目	National Natural Science Foundation of China[41806069] ; National Natural Science Foundation of China[41776073] ; Chinese Academy of Sciences (CAS) Strategic Priority Project[XDB26000000] ; State Key Laboratory of Palaeobiology and Stratigraphy[20182104]
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:001300067700001
项目资助者	National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) Strategic Priority Project ; State Key Laboratory of Palaeobiology and Stratigraphy
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44249
专题	中国科学院南京地质古生物研究所
通讯作者	Guo, Qimei; Li, Baohua
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Palaeobiol & Petr Stratig, 39 East Beijing Rd, Nanjing 210008, Peoples R China 2.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Guo, Qimei,Li, Baohua,Cai, Yue. Intermediate water circulation in the mid-latitude Northeast Atlantic over the past 13,000 years: Multi-proxy evidence from IODP Site U1391[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2024,654:17.
APA	Guo, Qimei,Li, Baohua,&Cai, Yue.(2024).Intermediate water circulation in the mid-latitude Northeast Atlantic over the past 13,000 years: Multi-proxy evidence from IODP Site U1391.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,654,17.
MLA	Guo, Qimei,et al."Intermediate water circulation in the mid-latitude Northeast Atlantic over the past 13,000 years: Multi-proxy evidence from IODP Site U1391".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 654(2024):17.