Arid
DOI10.1177/0959683614565952
Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach
Ausin, Blanca1; Flores, Jose A.1; Sierro, Francisco J.1; Cacho, Isabel2; Hernandez-Almeida, Ivan3; Martrat, Belen4; Grimalt, Joan O.4
通讯作者Ausin, Blanca
来源期刊HOLOCENE
ISSN0959-6836
EISSN1477-0911
出版年2015
卷号25期号:4页码:583-595
英文摘要

High-resolution paleoproductivity variations have been reconstructed in a productive cell in the Alboran Sea for the Holocene. Fossil coccolithophore assemblages have been studied along with the U37 k’ -estimated sea-surface temperature ( SST) and other paleoenvironmental proxies. The appearance of this cell is suggested at 7.7 ka cal. BP and was linked to the establishment of the western anti-cyclonic gyre. From that time until the present, the nannofossil accumulation rate of Florisphaera profunda has revealed successive episodes of weakening and strengthening of upwelling conditions in the Alboran Sea that have been simultaneous to changes in Western Mediterranean Deep Water ( WMDW) formation in the Gulf of Lions. A two-phase scenario operating at millennial-centennial time scale is proposed to explain this climatic and oceanographic variability: ( 1) coeval with more arid climate conditions, weaker northerlies or north-westerlies blowing over the Gulf of Lions would have triggered a slackening of WMDW formation. This together with a minor Atlantic Jet ( AJ) inflowing into the Alboran Sea would have led to less vertical mixing and, hence, a more stable water column in the study area; ( 2) wetter climate conditions would have prevailed in the region, while stronger northerlies or north-westerlies would have enabled WMDW reinforcement in the Gulf of Lions simultaneous to an intensification of the AJ that migrated southward. This would have increased vertical mixing, intensifying upwelling conditions in the study area. Here, the winter North Atlantic Oscillation ( NAO) is considered to be an important forcing mechanism for this variability, influencing WMDW formation, which in turn has been linked to short-term productivity variations during the last 7.7 ka in the Alboran Sea.


英文关键词Alboran Sea coccolithophore productivity Holocene North Atlantic Oscillation Western Mediterranean Deep Water
类型Article
语种英语
国家Spain ; Switzerland
收录类别SCI-E
WOS记录号WOS:000350760400002
WOS关键词NORTH-ATLANTIC OSCILLATION ; DEEP-WATER FORMATION ; CLIMATIC VARIABILITY ; THERMOHALINE CIRCULATION ; PLEISTOCENE FLUCTUATIONS ; OCEAN-SURFACE ; STRAIT ; CALIBRATION ; GIBRALTAR ; DYNAMICS
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/187667
作者单位1.Univ Salamanca, Dept Geol, E-37008 Salamanca, Spain;
2.Univ Barcelona, Dept Stratig Paleontol & Marine Geosci, E-08007 Barcelona, Spain;
3.Univ Bern, Inst Geog & Oeschger, Ctr Climate Change Res, CH-3012 Bern, Switzerland;
4.Inst Environm Assessment & Water Res, Dept Environm Chem, Barcelona, Spain
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GB/T 7714
Ausin, Blanca,Flores, Jose A.,Sierro, Francisco J.,et al. Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach[J],2015,25(4):583-595.
APA Ausin, Blanca.,Flores, Jose A..,Sierro, Francisco J..,Cacho, Isabel.,Hernandez-Almeida, Ivan.,...&Grimalt, Joan O..(2015).Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach.HOLOCENE,25(4),583-595.
MLA Ausin, Blanca,et al."Atmospheric patterns driving Holocene productivity in the Alboran Sea (Western Mediterranean): A multiproxy approach".HOLOCENE 25.4(2015):583-595.
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