globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.07.002
论文题名:
Late Quaternary sea surface conditions in the Laurentian Fan: Evidence from coccolith and dinocyst assemblages
作者: Balestra B.; Bertini A.; de Vernal A.; Monechi S.; Reale V.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 387
起始页码: 200
结束页码: 210
语种: 英语
英文关键词: Coccolith ; Dinocyst ; Holocene ; Late Quaternary ; Laurentian Fan ; St. Lawrence River
英文摘要: The analyses of coccoliths and dinocysts from the IMAGES core MD95-2033, collected on the Laurentian Fan (44°39.87N, 55°37.21W; water depth=1412. m) in the northwest North Atlantic provide a new dataset to assess the magnitude of climatic changes during the Holocene with a millennial time resolution. Coccolith and dinocyst data were combined to reconstruct changes in past sea surface conditions. In addition, the dinocyst assemblages were used to reconstruct the sea-surface temperature (SST) and salinity (SSS) based on the modern analog technique. The distribution of the coccolith and dinocyst assemblages, suggests a succession of climatic events during the late Quaternary and early Holocene, linked to change in the influence of the Labrador Current and/or the St. Lawrence River discharge. The dinocyst assemblages recorded a thermal optimum during the mid-Holocene. In the late Holocene, coccolith concentrations show two peaks at 2.3 and 1.1. ky, which coincide with the presence of species with different ecological properties, likely due to the localized influence of the Slope Water Jet (SWJ) current. The presence of this current has played a role in the development of the coccolith and dinocyst assemblages and SST fluctuations, especially in the last 2. ky. Overall, the interaction between the St. Lawrence River, the SWJ, the LC, and the NAC has all controlled the SSS, SSTs, and the development of the coccolith and dinocyst assemblages, confirming a significant regionalism of the entire area. © 2013.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69629
Appears in Collections:过去全球变化的重建

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作者单位: School of Earth and Environmental Sciences (SEES), Queens College, CUNY, 6530 Kissena Blvd, Flushing, NY 11367-1507, United States; Institute of Marine Sciences (IMS), University of California, Santa Cruz (UCSC), 1156 High Street, Santa Cruz, CA 95064, United States; Dipartimento di Scienze della Terra, Universita' degli Studi di Firenze, Via G. La Pira 4, 50121 Firenze, Italy; CNR-Inst. of Geosciences and Earth Resources (Section of Florence) Via G. La Pira 4, 50121 Florence, Italy; GEOTOP, Université du Québec à Montréal, CP 8888, Montréal, QC H3C 3P8, Canada

Recommended Citation:
Balestra B.,Bertini A.,de Vernal A.,et al. Late Quaternary sea surface conditions in the Laurentian Fan: Evidence from coccolith and dinocyst assemblages[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,387
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