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

文献类型：期刊论文

作者Guo, Qimei1; Li, Baohua1,2; Cai, Yue1
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2024-11-15
卷号654页码:17
关键词Antarctic Intermediate Water Mediterranean Outflow Water Younger Dryas Holocene climate change Iberian margin
ISSN号0031-0182
DOI10.1016/j.palaeo.2024.112428
通讯作者Guo, Qimei(qmguo@nigpas.ac.cn) ; Li, Baohua(bh-li@nigpas.ac.cn)
英文摘要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.
WOS关键词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
语种英语
WOS记录号WOS:001300067700001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) Strategic Priority Project ; State Key Laboratory of Palaeobiology and Stratigraphy
源URL[http://ir.nigpas.ac.cn/handle/332004/44248]  
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.

入库方式： OAI收割

来源：南京地质古生物研究所

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