globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.03.004
论文题名:
High resolution holocene record in the southeastern bay of biscay: Global versus regional climate signals
作者: Mojtahid M.; Jorissen F.J.; Garcia J.; Schiebel R.; Michel E.; Eynaud F.; Gillet H.; Cremer M.; Diz Ferreiro P.; Siccha M.; Howa H.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 377
起始页码: 28
结束页码: 44
语种: 英语
英文关键词: Bay of Biscay ; Benthic foraminifera ; Holocene ; Iberian Poleward Current (IPC) ; Navidad Current ; North Atlantic Oscillation (NAO) ; Planktic foraminifera
英文摘要: Core KS10b (North East Atlantic, 43°50'N, 2°03'W, water depth 550. m) was recovered at a location of high sediment deposition, and hence includes a high-resolution palaeoclimatic record for the southeastern Bay of Biscay over the last 9000 cal yr BP. The effect of global and regional climatic forcing factors (e.g., orbital forcing, North Atlantic Oscillation: NAO) and their subsequent control on water temperature, sea-level, hydrology and continental influence were investigated by studying planktic and benthic foraminiferal faunas (> 150 μm), sedimentology, and stable isotopes. Results indicate probable episodic long-term incursions of the warm and salty Iberian Poleward Current (IPC) into the Bay of Biscay during the Holocene by the intermittent presence of subtropical Globigerinoides ruber in the otherwise temperate fauna. These incursions seem to be triggered by negative NAO-like conditions. Our data show five main climatic periods, which are in general agreement with the literature data on the climatic variability in the North Atlantic and the Iberian Peninsula: The early Holocene (~ 9000-7400 cal yr BP) is characterized by low sea-level, significant downslope transport, eutrophic benthic settings and high surface water productivity. These environmental characteristics are probably due to the general wet and warm climate under a prevailing negative NAO, increasing precipitation and river runoff and favouring the incursion of the IPC into the Bay of Biscay. The climatic optimum appears between ~ 7400 and 6000 cal yr BP under a generally positive NAO index. In the following (~ 6000-3500 cal yr BP), surface water cooling is matching a steep decline of the Northern Hemisphere summer insolation. Meanwhile, benthic settings are changing progressively towards present day trophic conditions. The time interval from ~ 3500 to 1800 cal yr BP encompasses the Iberian-Roman Humid period characterized by warm and humid conditions, and increasing primary production under a prevailing negative NAO index. The last 1800. years were characterized by stable cool conditions, reflecting a change towards a positive NAO state. © 2013 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69756
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: UMR CNRS 6112 LPGN-BIAF, Laboratoire des Bio-Indicateurs Actuels et Fossiles, LUNAM Université, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France; Laboratoire d'Etude des Bio-Indicateurs Marins (LEBIM), Ker Chalon, Port Joinville, 85350 Ile d'Yeu, France; UMR CNRS-CEA 8212 LSCE, Laboratoire des Sciences du Climat et de l'Environnement, LSCE, Vallée Bât. 12, avenue de la Terrasse, 91198 Gif-Sur-Yvette Cedex, France; UMR CNRS 5805, EPOC, Environnements et Paléo-environnements OCéaniques, Université de Bordeaux, Site de Talence, 1, avenue des Facultés, 33405 Talence Cedex, France; Departamento Geociencias Marinas y Ordenación del Territorio, Facultad de Ciencias del Mar, Universidad de Vigo, 36310 Vigo, Spain; Earth Science Institute, The Hebrew University, Jerusalem 91904, Israel

Recommended Citation:
Mojtahid M.,Jorissen F.J.,Garcia J.,et al. High resolution holocene record in the southeastern bay of biscay: Global versus regional climate signals[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,377
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Mojtahid M.]'s Articles
[Jorissen F.J.]'s Articles
[Garcia J.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Mojtahid M.]'s Articles
[Jorissen F.J.]'s Articles
[Garcia J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Mojtahid M.]‘s Articles
[Jorissen F.J.]‘s Articles
[Garcia J.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.