DOI: 10.1016/j.palaeo.2014.11.011
论文题名: Coccolithophore productivity and surface water dynamics in the Alboran Sea during the last 25kyr
作者: Ausín B. ; Flores J.-A. ; Sierro F.-J. ; Bárcena M.-A. ; Hernández-Almeida I. ; Francés G. ; Gutiérrez-Arnillas E. ; Martrat B. ; Grimalt J.O. ; Cacho I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 418 起始页码: 126
结束页码: 140
语种: 英语
英文关键词: Alboran Sea
; Coccolithophore productivity
; Deglaciation
; Last Glacial Maximum
; Oxygen isotopes
; SST
英文摘要: Coccolithophore productivity and surface water dynamics for the last 25. kyr in the Alboran Sea (Western Mediterranean) are described in a study of high-resolution sedimentary records from two cores, HER-GC-T1 and CEUTA10PC08, whose locations are currently characterized by different hydrographic conditions. Fossil coccolithophore assemblages and oxygen isotopes and alkenone- and planktonic foraminifera-derived sea surface temperature (SST) records allowed a reconstruction of the properties of the inflowing Atlantic Water (AW), which have proved to be a primary control of the variations in productivity in the neighborhood of the Strait of Gibraltar. Other local factors, such as fluvial discharge, wind-induced and eddy-induced upwelling, are proposed to have influenced marine productivity in more distant areas. The entrance of cold and less saline AW during the stadials associated with Heinrich events 2 and 1 prevented primary productivity, which increased along the Last Glacial Maximum, probably due to a greater fluvial discharge. During Terminations 1a and 1b, the upper water column was affected by stratification, although wind-induced upwelling occurred locally. The Bølling-Allerød was characterized by a gradual increase in productivity and the development of the organic-rich layer. Two phases of the Younger Dryas are recognized: a first phase, which was colder, followed by a second phase, which was warmer and wetter. Differences in productivity between both locations during these two phases can be attributed to fluvial discharge and the changing properties of the AW. Local hydrography, such as the dynamics of the western anticyclonic gyre, gained greater importance in determining productivity and its variations during the Holocene, which was the most productive period. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69069
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University of Salamanca, La Merced, Salamanca, Spain; Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Erlachstrasse 9a, Bern, Switzerland; Department of Marine Geosciences, University of Vigo, Campus As Lagoas, Marcosende,Vigo, Spain; Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research, Jordi Girona 18, Barcelona, Spain; Department of Stratigraphy, Paleontology and Marine Geosciences, University of Barcelona, Martí i Franquès, Barcelona, Spain
Recommended Citation:
Ausín B.,Flores J.-A.,Sierro F.-J.,et al. Coccolithophore productivity and surface water dynamics in the Alboran Sea during the last 25kyr[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,418